Saturated aqueous solution of lead chromate as a calibration reference material for Cr(vi)

Abstract

A saturated solution of PbCrO₄ has been proposed as a Calibration Reference Material for Cr(VI). Statistically evaluated results of Cr(VI) determination in a saturated solution of PbCrO₄ by electrothermal atomization atomic absorption spectrometry (ETAAS) confirm that the found concentration of Cr(VI), (6.99 ± 0.34 μg l⁻¹) is in complete agreement with the calculated value of Cr(VI) in that solution—7.0 μg l⁻¹. The advantage of such a Calibration Reference Material is that the concentration of Cr(VI) is theoretically predictable on the base of solubility product constant and does not require independent determination.