2002•Journal of Guangxi Normal UniversityRequires access

SPECTROPHOTOMETRIC DETERMINATION OF TRACE CHROMIUM IN STEEL WITH DBC-ARSENAZO

Cha Dan-ming

Abstract

The color reaction of Cr(Ⅲ) with DBC-arsenazo is investigated.The results show that under weak acid and heating conditions,DBC-arsenazo and Cr(Ⅲ) formed 2∶1 blue complex,the maximum absorption wave lenghth locates in 625nm,the apparent molar absorption coefficient is 2.46×104L·mol -1·cm -1.Beer's law is obeyed over a range of 0～15μg chromium per 25mL.Based on this reaction a new directed determination method for trace chromium is established.In contrast to those of the standard sample of alloy steel,the experimental results are satisfied.

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Key concepts: dBc, Chromium, Analytical Chemistry (journal), Color reaction, Materials science, Alloy, Molar absorptivity, Trace Amounts