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These procedures were designed and tested for internal use by OSHA personnel. Mention of any company name or commercial product does not constitute endorsement by OSHA.
||0.1 mg/m3 as total mercury (TWA)
||A passive or an active sampling device are available. Both devices use HydrarR or
hopcalite as the solid sorbent.
|Recommended Sampling Rate
0.020 L/min (@ 20 °C and 101 kPa)
|Recommended Air Volume Range
3 to 100 L
||The sorbent is digested using nitric acid and hydrocloric acid. The mercury in
the sample is reduced to elemental mercury using stannous chloride and analyzed using a cold vapor-atomic
Qualitative Passive Dosimeter:
0.002 mg/m3 for a 240-min (4.8 L)sample
0.00067 mg/m3 for a 75-min (15 L) sample
0.004 mg/m3 for a 240-min (4.8 L) sample
0.0013 mg/m3 for a 75-min (15 L) sample
|Precision and Accuracy
Passive Dosimeter Validation Range:
0.061 to 0.20 mg/m3
|Date (Date Revised):
||1987 (June, 1991)
Division of Physical Measurements and Inorganic Analyses
OSHA Technical Center
This method describes the collection of airborne elemental mercury in a passive dosimeter or active sampling device
and subsequent analysis using a cold vapor-atomic absorption spectrophotometer (CV-AAS).
The mercury dosimeter samples the workplace atmosphere by controlled diffusion into the badge while the active
sampler uses a calibrated sampling pump. The mercury vapor entering either passive or active device is collected
on a solid sorbent (HydrarR or hopcalite) which has an irreversible affinity for mercury
8.2. After sample collection the sorbent is initially dissolved with concentrated nitric acid and then
hydrochloric acid. Stannous chloride is added to an aliquot of the sample to generate mercury vapor. This vapor
is then driven into an absorption cell of a flameless atomic absorption spectrophotometer for analysis.
Previously, mercury samples were collected on iodine-impregnated charcoal contained in glass tubes.
The treated charcoal was analyzed for mercury by placing it in a tantalum sampling boat and then heating to drive
the mercury vapor into the beam of an atomic absorption spectrophotometer.
8.3 The amount of mercury was determined by
absorbance at253.7 nm. The detection limit was approximately 0.1 µg. Drawbacks with this method were:
a. The mercury vapor and hence the entire sample was immediately lost into the surrounding atmosphere
Hopcalite solid sorbent
8.5 was substituted in place of the iodine-impregnated charcoal for
mercury vapor sampling. Previously, hopcalite had been used in respirator cartridges for carbon monoxide and consisted
of oxides of copper, manganese, cobalt, and silver.
8.6 Analysis of recent batches of hopcalite used for mercury
collection indicate the composition was mainly oxides of manganese and copper.
b. The method was imprecise at lower sample loadings
c. The analytical technique was somewhat tedious
HydrarR has been used as a substitute for collecting mercury vapor and is very similar
in composition to hopcalite. A ceramic material, insoluble in nitric and hydrochloric acid, is present in the
HydrarR but not in the hopcalite.
1.3. Advantages and Disadvantages
1.3.1. These sampling and analytical techniques have adequate sensitivity for measuring workplace atmospheric
concentrations of elemental mercury.
1.4. Toxic Effects (This section is for information only and should not be taken as a basis for OSHA policy.)
1.3.2. The passive dosimeter used for collection of mercury vapor is small, lightweight, and requires no sampling pumps.
Also, the dosimeter housing is reusable; therefore, cost per measurement is kept to a minimum.
1.3.3. The collected mercury sample is stable for at least 30 days.
1.3.4. Sample preparation for analysis involves simple procedures.
1.3.5. Either sampling device can be analyzed in any laboratory equipped with a CV-AAS.
1.3.6. A disadvantage with the passive dosimeter is particulate compounds cannot be collected with the device.
A separate sampling pump and collection media should be used for particulate collection.
1.3.7. Another disadvantage with the dosimeter is sample rate dependence on face velocity. The dosimeter should not be
used in areas where the air velocity is greater than 229 m/min (750 ft/min) since erratic increases in sampling rate may occur.
1.3.8. A disadvantage with the active device is the dependence on a calibrated pump to take the sample.
Exposure to elemental mercury vapor can occur via the respiratory tract and skin. Possible symptoms from an acute exposure include
severe nausea, vomiting, abdominal pain, bloody diarrhea, kidney damage, and death. These symptoms usually present themselves within
10 days of exposure. Potential symptoms from a chronic exposure include inflammation of the mouth and gums, excessive salivation,
loosening of the teeth, kidney damage, muscle tremors, jerky gait, spasms of the extremities, personality changes, depression,
irritability, and nervousness. 8.7,
1.5. Workplace Exposure
Occupations with potential exposure to mercury and its compounds are listed:
|battery makers, mercury
||investment casting workers
|calibration instrument makers
|cap loaders, percussion
||laboratory workers, chemical
|carbon brush makers
|caustic soda makers
|dental amalgam makers
||neon light makers
|direct current meter workers
||percussion cap makers
||pressure gage makers
|electric apparatus makers
||switch makers, mercury
||wood preservative workers
1.6. Properties 8.7,
Elemental mercury (CAS No. 7439-97-6) is a silver-white, heavy, mobile, liquid metal at
room temperature. Some physical properties and data for mercury are:
||13.546 g/mL (20 °C)
The high vapor pressure of mercury at normal temperatures combined with the potential toxicity
makes good control measures necessary to avoid exposure. Also, the concentration of mercury vapor in the air rapidly
increases as the temperature increases. To illustrate, listed below are vapor pressures of mercury, and mercury
concentrations of air after saturation with mercury vapor at different temperatures:
Vapor Pressure-Saturation Concentration of Mercury at Various Temperatures
2.1. The qualitative and quantitative detection limits for the analytical procedure are 0.01 µg
and 0.02 µg mercury, respectively.
3. Method Performance
2.2. Working Range
The range of the analytical procedure has been determined to be 0.1 to 2 µg mercury.
Using the analytical conditions specified, a nonlinear response was noted above 2 µg.
3.1. The SKC HydrarR gas
monitoring dosimeter badge for mercury (SKC Inc., Eighty Four, PA) was evaluated at 80% RH and
25 °C over the range of 0.061 to 0.203 mg/m3 using a dynamic
generation system.8.2 The pooled coefficient of variation (CVT) for
badge samples taken in this concentration range was 0.039. The average recovery was 100.8% and the
overall error was ±8.6%.
In a separate study, active samplers were spiked with mercury in the range of 1 to 2.5 µg. The mean recovery of these 125 quality
control samples was 96.9% with a CV1 of 0.106
3.2. In storage stability studies, the mean recoveries of HydrarR
samples analyzed 5, 14, and 30 days after collection were within ±10% of the
known generated concentration 8.2
3.3. The HydrarR active sampling device was compared
using linear regression statistics to the dosimeter in a field study.
8.11 The dosimeter results agreed well with
the active sampler and are summarized below (Note: A correlation coefficient and slope = 1 would indicate ideal agreement):
| Number of paired samples
| Concentration Range
|| 0.01 to 0.7 mg/m3
| Correlation coefficient
|Standard deviation of the slope
Particulate mercury compounds are a positive interference; however, the badge does not sample
particulates and the glass wool of the active sampler prevents particulate from entering the sorbent.
Chlorine in the sampled air does not interfere when using HydrarR or hopcalite sorbent.
The chlorine does react with available mercury vapor in the air to presumably form mercuric chloride
Workplaces containing both chlorine and mercury should be sampled for both mercury vapor and particulate.
Organic-free deionized water should be used during sample and standard preparation. Any compound with
the same absorbance wavelength as mercury (253.7 nm) can be a positive interference. Some volatile organic
compounds (i.e. benzene, toluene, acetone, carbon tetrachloride) absorb at this wavelength and are considered
analytical interferences. They occur as contaminants in the reagents used during sample preparation. These
compounds are not expected to be retained on HydrarR or hopcalite during sample collection.
Analytical interferences are rendered insignificant by using organic-free deionized water and at least
reagent grade chemicals or by blank subtraction.
Increasing the concentration of nitric acid in the samples or standards appears to produce an elevated background
signal. The nitric acid concentration in the samples and standards should not be greater than 10%.
[Note: A prefilter assembly, consisting of a mixed-cellulose ester filter in
a polystyrene cassette, can be used with the active samplers. Although a significant loss of mercury vapor, presumably due
to the prefilter assembly, has been noted when using this type of sampling train
8.12, these results were not duplicated
in a series of recent experiments
Either tubes or dosimeters can be used to collect mercury vapor. The dosimeter should not be used when:
1. The air velocity of the sampling site is greater than 229 m/min (750 ft/min)
The tube can be used to determine total mercury (vapor +
particulate). The badge can only collect mercury vapor. For short-term
exposures to particulate mercury, or for wipe and bulk sampling and analysis
consult reference 8.14
for further information.
2. The operation being sampled is characterized by extremely poor hygienic practices and splashing of
mercury on the badge may occur
3. Determination of total mercury is necessary and mercury particulate appears
to be present in the workplace atmosphere
5.1.1. PASSIVE DOSIMETER:
5.2. Sampling Procedure - PASSIVE DOSIMETER
Gas monitoring dosimeter badge and pouch containing a HydrarR capsule [badge - cat. no. 520-03, pouch - cat. no.
520-02 (SKC Inc., Eighty Four, PA)]. The capsule contains 800 mg of sorbent.
5.1.2. ACTIVE SAMPLER:
HydrarR or hopcalite sampling tubes (cat. no. 226-17-1 or 226-17-lA, SKC, Inc., Eighty Four, PA). These
are 6-mm o.d. × 70-mm long glass tubes which contain 200 mg of sorbent.
Note: Before use, the active sampling tubes must be examined for movement of the the solid sorbent into the glass wool. See Section 5.3.1.
for further details.
5.1.3. Sampling pumps capable of sampling at 0.2 liters per minute (L/min).
5.1.4. Assorted flexible tubing.
5.1.5. Stopwatch and bubble tube or meter for pump calibration.
5.2.1. Assemble the components of the mercury monitoring badge according to
manufacturer instructions 8.1
5.3. Sampling Procedure - ACTIVE SAMPLER
Note: A foam insert must be placed in the Model 520-03 dosimeter to
hold the capsule in place 8.13
5.2.2. Record the sampling start time, sampling site temperature, and atmospheric pressure. Remove the protective cap and then place the
dosimeter in the breathing zone of the employee. The suggested sampling time for the dosimeter is 8 h.
5.2.3. Immediately after sampling, carefully remove the sorbent capsule from the dosimeter and place it in the sorbent pouch. Fold the pouch
top twice and press it flat to seal the capsule inside the pouch. Record the sampling stop time, final temperature, and atmospheric pressure.
Calculate and record the total sampling time, average temperature, and pressure.
5.3.1. Calibrate each personal sampling pump with an active sampler in-line using a flow rate of about 0.2 L/min.
5.4. Sample Shipment
Note: A prefilter assembly consisting of a mixed-cellulose ester filter, polystyrene cassette, and a minimum
amount of Tygon tubing can be used if:
1. particulate mercury compounds may present a problem during sampling or
Before use, the active sampling tubes must be examined for movement of the solid sorbent into the glass wool. Certain
lots of HydrarR or hopcalite have been noted as being very friable or having a sorbent particle-size range small
enough as to allow migration. This movement can easily be noted - the glass wool in the sampling tube appears somewhat discolored (darkened)
from the small sorbent particles. If sorbent migration has occurred, a prefilter assembly is recommended. The recommended sampling flow rate
is also 0.2 L/min with the prefilter-sampling tube-pump assembly.
2. the hopcalite or HydrarR contained in the active sampling tube has migrated to the glass wool plug.
5.3.2. Connect a sampling tube (or sampling assembly) to a calibrated pump using flexible tubing. If a prefilter is used, connect it to the
sampling tube with a minimum amount of Tygon tubing. Connect the other end of the sampling tube to the pump. Place the sampling tube
(or assembly) in the breathing zone and the pump in an appropriate position on the employee.
5.3.3. Use an air volume in the range of 3 to 100 L to collect the mercury in the workplace air. Record the total volume.
5.3.4. Replace the plastic end caps on the active sampler after sampling is completed.
5.4.1. Securely wrap each sorbent pouch or active sampling tube end-to-end with an OSHA Form 21 sample seal. Also seal and
prepare cassettes if a prefilter assembly was used.
5.4.2. Submit at least one blank sample with each set of samples. The blank sample should be handled in the same manner as the other samples
except that an air sample is not taken.
5.4.3. Request the laboratory to analyze the samples for mercury. Submit any pertinent sampling information to the lab. Record
if a prefilter assembly was used.
5.4.4. Ship the sealed pouches and used dosimeter housings, or active sampling tubes to the laboratory in appropriate containers as soon as
possible. The filter/cassette assembly can also be submitted for mercury particulate analysis; however, sampling periods may be longer than
reflected in exposure regulations. The PEL for mercury particulate is a Ceiling8.14 and the vapor is a TWA PEL.
6.1. Safety Precautions
6.1.1. Wear safety glasses, lab coat, and gloves at all times.
6.2. Equipment - Cold Vapor Analysis
6.1.2. Handle acid solutions with care. Avoid direct contact of acids with work area surfaces, eyes, skin, and clothes. Flush acid solutions
which contact the skin or eyes with copious amounts of cold water.
6.1.3. Prepare solutions containing hydrochloric acid in an exhaust hood and store in narrow-mouthed bottles.
6.1.4. Keep B.O.D. bottles containing stannous chloride/hydrochloric acid solutions capped when not in use to prevent inhalation of noxious vapors.
6.1.5. Exercise care when using laboratory glassware. Do not use chipped pipets, volumetric flasks, beakers or any glassware with sharp edges exposed.
6.1.6. Never pipet by mouth.
6.1.7. When scoring the glass of active samplers to remove the sorbent before analysis, score with care. Apply only
enough pressure to scratch a clean mark on the glass. Use a paper towel or cloth to support the opposite side while
scoring. Moisten the mark with DI H2O and wrap the tube in cloth before breaking. If the
tube does not break easily, re-score. Dispose of glass in a waste receptacle specifically designed and
designated for broken-glass.
6.1.8. Always purge the mercury from the CV-AAS into an exhaust vent.
6.1.9. Occasionally monitor the CV-AAS for mercury vapor leaks using an appropriate direct reading instrument.
(Note: Specific equipment is listed for illustration only)
6.2.1. Atomic absorption spectrophotometer (model 503, Perkin-Elmer, Norwalk, CT).
6.3. Reagents - All reagents should be at least reagent grade.
6.2.2. Mercury hollow cathode lamp or electrodeless discharge lamp and power supply.
6.2.3. Biological Oxygen Demand (B.O.D.) bottles, borosilicate glass, 300 mL.
6.2.4. Peristaltic pump, 1.6 to 200 mL range, and controller, 1-100 rpm range (Masterflex model 7553-30
with model 7015 head, Cole-Parmer, Chicago, IL).
6.2.5. Quartz absorption cell, 22-mm (7/8 in) o.d. × 152-mm (6 in) long (part no. 303-3101,
6.2.6. Heating tape.
6.2.7. Variable transformer 50-60 Hz, 10 A, 120 V input, 0-140 V output, 1.4 kW (Superior Electric, Bristol, CT).
6.2.8. Tygon peristaltic pump tubing (part no. N06409-15, Cole-Parmer) and glass tubing.
6.2.9. Aerator (part no. 0303-3102, Perkin-Elmer).
6.2.10. Chart recorder.
6.2.11. Desiccant (Drierite, W.A. Hammond Drierite Co., Xenia, OH).
6.2.12. Volumetric flasks, volumetric pipets, beakers, and other laboratory glassware.
6.2.13. Automatic pipets, adjustable, 0.1 to 5.0 mL range (models P-1000 and P-5000, Rainin Instruments Co., Woburn, MA).
6.2.14. Glass tube scorer, or needle, 21 to 25 gauge - for removing metal screens in dosimeters or glass wool from tubes. A piece of bent
wire can also be used.
6.2.15. Exhaust vent.
Stannous chloride, (SnCl2)
6.3.1. Deionized water (DI H2O), organic-free.
6.4. Glassware Preparation
6.3.2. Hydrochloric acid (HCl), concentrated (36.5 to 38%), with a mercury concentration less than 0.005 ppm.
6.3.3. Mercury standard stock solution, 1,000 µg/mL: Use a commercially available certified standard or,
alternatively, dissolve 1.0798 g of dry mercuric oxide (HgO) in 50 mL of 1:1 hydrochloric acid and then dilute to 1 L
with DI H2O. Store this reagent in a dark environment, preferably in an amber colored container.
6.3.4. Nitric acid (HNO3), concentrated (69 to 71%), with a mercury concentration less than 0.005 ppm.
6.3.5. Nitric acid, 1:1: Carefully add equal portions of concentrated HNO3 and DI H2O.
6.3.6. Nitric acid, 10%: Carefully add 100 mL concentrated HNO3 to 900 mL DI H2O.
6.3.7. Stannous chloride (SnCl2) solution, 10%: Dissolve 20 g SnCl2 in 100 mL
concentrated HCl. Slowly and carefully pour this solution into 100 mL DI H2O and then mix well.
Transfer and store the final solution in a capped B.O.D. bottle to prevent oxidation. Prepare this solution before each new analysis.
6.4.1. Clean the B.O.D. bottles and stoppers with 1:1 HNO3 and thoroughly rinse with DI H2O prior to use.
6.5. Standard Preparation
6.4.2. Rinse all other glassware with 10% nitric acid and then with DI H2O prior to use. Air dry
all 50-mL volumetric flasks to be used in sample preparation.
6.5.1. Prepare a 1 µg/mL mercury standard by making appropriate ten-fold serial dilutions of the 1,000 µg/mL
mercury standard stock solution with 10% HNO3.
6.6. Sample Preparation [Note: A hooked needle or piece of fine wire is useful to remove the dosimeter screen or glass
wool (active sampler) and the sorbent particles.]
6.5.2. Prepare working mercury standards (ranging from 0.1 to 2.0 µg) and reagent blanks immediately prior to
use. A few standards at each concentration should be made. Add an appropriate aliquot of the 1 µg/mL standard to a clean B.O.D.
bottle containing enough 10% HNO3 to bring the total volume to 100 mL. A suggested dilution scheme is given:
|Mercury Standard (µg)
||Final Volume (mL)
|* Aliquot taken from 1 µg/mL standard prepared in Section 6.5.1.
6.7. Analysis - Instrument Parameters
Open each sample pouch and remove the sorbent capsule. Carefully remove the screen from the top of the capsule without losing
any sorbent. Carefully pour the sorbent into a clean, dry 50-mL flask without spilling any. Discard the screen and
6.6.2. ACTIVE SAMPLER
Score the tube with a glass tube cutter (also see Section 6.1.7.) and then break open the front section of the tube above the glass
wool. An alternative approach to scoring and breaking is to carefully remove the glass wool with a bent wire or needle.
1. If a prefilter was not used during sampling, place the glass wool and sorbent into
separate 50-mL volumetric flasks.
2. If a prefilter was used and the glass wool appears to contain hopcalite or Hydrar, the glass wool can be
analyzed along with the sorbent. Carefully transfer the glass wool and sorbent to a 50-mL volumetric flask without losing any
of the particles.
Prepare and analyze any prefilters according to reference 8.14.
6.6.4. Add 2.5 mL of concentrated HNO3 followed by 2.5 mL concentrated HCl to each volumetric flask [Note: To minimize any loss of
mercury through a change in oxidation state, the HNO3 is added before the HCl
6.6.5. Gently swirl the sample occasionally for approximately 1 h. If HydrarR was used to collect the sample,
the dark brown solution will also contain some undissolved clear to white-tan colored ceramic material.
6.6.6. Carefully dilute to a 50-mL total volume with DI H2O. The final sorbent
sample solution will be light blue or blue-green. This is a good place to stop if the analysis cannot be completed
the same day.
6.7.1. Set up the CV-AAS as illustrated in Figure 1.
6.7.2. Wrap the heating tape around the quartz cell and then turn on the variable transformer. The heat setting on the tape should
be sufficient to prevent water vapor condensation in the absorption cell.
6.7.3. Place the aerator in a B.O.D. bottle which contains approximately ½ to 1 inch of desiccant. Operate the peristaltic
pump for approximately 30 min at full speed to remove any water vapor from the system.
6.7.4. Operate the hollow cathode or electrodeless discharge mercury lamp at the manufacturer's recommended current or power rating.
6.7.5. Use the following settings (Note: The mentioned instrument settings are for specific models used at the OSHA-SLCAL.
If instrumentation other than what is specified in Section 6.2. is used, please consult the instrument manufacturer's recommendations.):
Atomic Absorption Spectrophotoineter:
Strip Chart Recorder:
6.7.6. Optimize the ENERGY meter reading at 253.7 nm.
6.7.7. Align the beam of the mercury lamp so it passes directly through the center of the quartz cell windows.
This can be accomplished by adjusting the burner height, depth, and angle knobs to give a minimum ABSORBANCE reading.
6.7.8. Operate the peristaltic pump at full speed. Rinse the aerator with DI H2O and insert it into
a holder in the exhaust vent.
6.7.9. Perform the following steps to obtain a baseline signal near an absorbance of zero:
1. start the chart recorder,
2. set the spectrophotometer absorbance reading to zero,
3. wait until the baseline stops drifting,
4. set the reading to zero again.
6.8.1. Samples: Immediately before analyzing, transfer an appropriate aliquot of the sample
solution to a clean B.O.D. bottle containing enough 10% HNO3 solution to bring the total volume to
100 mL. The transfer must be done with a volumetric pipet.
6.9. Analytical Recommendations
6.8.2. Standards: Immediately before analyzing, prepare standards according to instructions listed in Section
6.8.3. Deliver 5 mL of the 10% SnCl2 solution with an automatic pipet to a B.O.D. bottle containing a
standard, reagent blank, or sample to be analyzed. Immediately place the aerator into the solution with the peristaltic pump
operating at full speed.
6.3.4. Record the maximum absorbance reading and label the signal produced on the strip chart.
6.8.5. Stop the pump, remove the B.O.D. bottle from the CV-AAS and stopper it. Rinse the aerator
with DI H2O and insert it into a holder in the exhaust vent. Turn the pump on at full speed until
the CV-AAS system is purged of mercury and the baseline returns to zero.
6.8.6. If the absorbance reading of a sample is greater than the highest standard at any time during analysis, immediately
remove the B.O.D. bottle from the CV-AAS. Purge the system following the procedure listed in Section 6.8.5.
Take a smaller aliquot or dilute the high concentration sample and re-analyze. Make any necessary sample dilutions with
10% HNO3 and use the appropriate dilution factor when calculating results.
6.8.7. Repeat Sections 6.8.3. through 6.8.5. for each prepared standard, reagent blank, or sample.
6.9.1. It is recommended to analyze the reagent blank, lowest, and highest standard two or three times each
to check for contamination, reproducibility, and sensitivity before starting the sample analysis. A 2.0-µg mercury standard
should give a three-quarter to full-scale deflection on the chart recorder and an absorbance unitreading
of about 0.850 when using the equipment and conditions specified. The lowest and highest standard should provide a linear response
and the lowest standard should be at least two to three times the blank signal.
6.9.2. It is also recommended to analyze an entire series of standards (including the reagent blank) at the beginning and end
of the sample analysis to ensure standard readings are reproducible. As a general guideline, standard readings should be within
±10% throughout the analysis.
6.9.3. A standard near the concentration range of the samples should be analyzed after every four to five samples.
6.9.4. Quality control (QC) samples should be prepared and analyzed using the same matrix and analytical conditions as the
samples. If possible, the QC samples should be generated from an independent source.
6.9.5. Approximately 10% of the samples should be reanalyzed.
7.1. Use a least squares regression program to plot a concentration-response curve of peak
absorbance versus the amount (µg) of mercury in each standard.
7.2. Determine the amount (µg) of mercury, A, corresponding to the peak absorbance in each analyzed sample aliquot from this curve.
7.3. Calculate the total amount (µg) of mercury, W, in each sorbent or glass wool sample:
||(A) (sample volume, mL) (DF)
DF = Dilution Factor (if none, DF = 1)
7.4. A blank correction is made for each sample (Note: When using the reagents and conditions specified, previous blank results have been
less than 1 µg). Calculate the concentration of mercury in each sorbent or glass wool sample:
|mercury mg/m =
||W - Wb
air volume, L
||Total µg of mercury in the blank sample.
||Sampling time × flow rate (for ACTIVE SAMPLERS)
||For PASSIVE DOSIMETERS, the sampling rate is affected by temperature and pressure. To correct for this, use:
Air vol = ST × 0.020 × (T1/T2)
1.5 × (P2/P1)
||Sampling time (min)
||Sampling rate (L/min) at 20 °C and 760 torr
||Sampling site temperature (K)
||Sampling site pressure (torr)
7.5. Reporting Results to the Industrial Hygienist
For PASSIVE DOSIMETER samples, report results to the industrial hygienist as mg/m3 mercury vapor.
For ACTIVE SAMPLERS, report results as:
a) mg/m3 mercury vapor
For mercury vapor result a): If a prefilter was used and the glass wool and sorbent were
b) mg/m3 total mercury
|mercury vapor = glass wool + sorbent
The prefilter (if used) was present during sampling to assure that mercury particulate was not trapped in
the glass wool.
For total mercury result (b): The sum of the mercury found in the sorbent (vapor), glass wool, and prefilter
(if used) for each active sampler is considered. This result is used to
determine total mercury.
Any mercury particulate anticipated on the prefilter can be analyzed for
mercury. See Reference 8.14 for
If sampling information has not been provided by field personnel, results are reported in total micrograms.
8.1. SKC Inc.: Gas Monitoring Dosimeter Badge for Mercury (Operating Instructions). Eighty Four, PA: SKC
Inc., no publication date given.
Evaluation Of A Solid Sorbent Passive Dosimeter For Collecting Mercury Vapor by J. Ku (OSHA-SLTC Backup Report for Method No. ID-140).
Salt Lake City, UT, Revised 1989.
8.3. Moffitt, A.E., Jr. and R.E. Kupel: A Rapid Method
Employing Impregnated Charcoal and Atomic Absorption Spectroscopy for the Determination of Mercury. Am. Ind. Hyg. Assoc.
J. 32: 614 (1971).
8.4. McCammon, C.S., Jr., S.L. Edwards, R.D. Hull, and W.J. Woodfin:
A Comparison of Four Personal Sampling Methods for the Determination of Mercury Vapor. Am. Ind. Hyg. Assoc. J. 41:
8.5. Rathje, A.O. and D.H. Marcero: Improved Hopcalite Procedure for the Determination of Mercury Vapor in Air by
Flameless Atomic Absorption. Am. Ind. Hyg. Assoc. J. 37: 331 (1976).
8.6. Sax, N.I. and R.J. Lewis Sr., ed.: Hawley's Condensed Chemical Dictionary. 11th ed. New York: Van Nostrand
Reirihold Co., 1987.
8.7. Windholz, M., ed.: The Merck Index. 10th ed. Rahway,
NJ: Merck & Co. Inc., 1983.
Criteria for a Recommended Standard: Occupational Exposure to Inorganic Mercury (DHEW/NIOSH Pub. No. HSM-73-11024). Cincinnati, OH: National Institute for Occupational Safety and Health, 1973.
8.9. Occupational Safety and Health Administration Analytical
Laboratory: Detection Limit Study for Mercury Cold Vapor
Analysis by C. Merrell. Salt Lake City, UT. 1987 (unpublished).
8.10. Occupational Safety and Health Administration Analytical Laboratory:
Quality Control Data - Mercury Cold Vapor
Analysis by B. Babcock. Salt Lake City, UT. 1987 (unpublished).
Evaluation Of A Solid Sorbent Passive Dosimeter For Collecting Mercury Vapor
by R. Cee, J. Ku, E. Zimowski, S. Edwards, and J. Septon (OSHA-SLCAL Product Evaluation No. PE-6). Salt Lake City, UT. 1987.
8.12. Menke, R. and G. Wallis: Detection of Mercury in Air in the Presence of Chlorine and Water Vapor.
Am. Ind. Hyg. Assoc. J. 41: 120-124 (1980).
8.13. Occupational Safety and Health Administration Technical Center: An Evaluation of
Hopcalite Sampling Methods for
Mercury by J. Septon. Salt Lake City, UT. In progress (unpublished).
Particulate Mercury In Workplace Atmospheres
(OSHA-SLTC Method No. ID-145). Salt Lake City, UT. 1989.
|Cold Vapor-Atomic Absorption Spectrophotometer for Mercury Analysis
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