29.1 For the photometric determination of lead in a mineral with PAR, a standard solution of the chelate complex was prepared by dissolving 0.0100 g in 50.0 cm3. Aliquots
of the solution were photometrically measured after treatment with the reagent and bringing the volume to 50.0 cm3. The measurement data are given:
V, cm3 0.5 1.0 1.5 2.0
A520 0.074 0.145 0.223 0.296
Determine the lead content in the mineral if a sample of 0.5200 g was taken for analysis. It was dissolved in 100.0 cm3. The same reagent was added to an aliquot of it, equal to 20.0 cm3, the volume was brought to 50.0 cm3. The optical density of this solution is 0.45.
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