The average percent error for the method is estimated as 2.9.
All reagents must be analytical reagent grade or better.
Dry the hydrated TiOSO4• xH2SO4• xH2O (mw > 402) overnight in a desiccator. In a beaker, place 5.5g of the dried TiOSO4• xH2SO4• xH2O, 20g of (NH4)2SO4 and 100 mL of concentrated H2SO4. Heat gradually for several minutes until the chemicals are dissolved. The mixture is cooled to room temperature, poured carefully into 350 mL H2O, filtered through an HA filter to remove any trace of turbidity, and then diluted to 500 mL. A 1:50 dilution of this stock solution is titanium reagent or collecting solution.
Positive interference can be expected from any compound collected that liberates H2O2 on acid hydrolysis. Negative interferences are a function of the reactivity of H2O2 with other compounds present in the air sample.
Typical values used for a curve are given:
|Standard Aliquot||(410 nm)||µg H2O2|
The total weight of H2O2 in the sample is calculated by the equation:
µg(H2O2) = [(aliquot µg - blank aliquot µg)(sample volume, mL)] / (sample aliquot volume, mL)
ppm(H2O2) = N(H2O2) x 17.0 x 1000.
mgH2O2/m3 = µgH2O2/1
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