2008•Hydrometallurgy of ChinaRequires access

Spectrophotometric Determination of Chromium With Arsenazo-DBS

Sun Sai-lin

Abstract

In a medium of CH2ClCOOH-NH4Ac-HClO4,chromium(Ⅲ) reacts with arsenazo-DBS to form a blue complex with a composition of 1∶1(R∶M).The maximum absorption wavelength of the complex locates at 610 nm.The apparent molar absorptivity of the method for determing chromium is e610 nm =1.37 × 104L/(mol·cm).Beer's law is obeyed over the concentration range of 0 ～1.0 μg/mL of chromium(Ⅲ).The present method has been satisfactorily applied to determine chromium in tea samples.

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Key concepts: Chromium, Molar absorptivity, Chemistry, Spectrophotometry, Molar ratio, Absorption (acoustics), Analytical Chemistry (journal), Wavelength