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2005•Journal of Guangdong University of TechnologyRequires access

Study on the Spectrophotometric Determination of Chromium by Bleaching Arsenazo M

Zhang Yu-guang

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Abstract

A new method is reported for spectrophotometric determination of trace amounts of chromium based on decoloarizing reaction of arsenazo M by Cr(VI) in H_2SO_4 medium.The fading in color is directly proportional to the amounts of chromium.The maximum absorption is at 550?nm and the apparent molar absorptivity is 2.33×10~4?L·mol~(-1)·cm~(-1).The linear range is 0～1.2?mg/L of Cr(VI).The method has been applied to the determination of trace chromium in soil with satisfactory results.

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What this paper is about

A new method is reported for spectrophotometric determination of trace amounts of chromium based on decoloarizing reaction of arsenazo M by Cr(VI) in H_2SO_4 medium.The fading in color is directly proportional to the amounts of chromium.The maximum absorption is at 550?nm and the apparent molar absorptivity is 2.33×10~4?L·mol~(-1)·cm~(-1).The linear range is 0～1.2?mg/L of Cr(VI).The method has been applied to the determination of trace chromium in soil with satisfactory results.

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Available abstract

A new method is reported for spectrophotometric determination of trace amounts of chromium based on decoloarizing reaction of arsenazo M by Cr(VI) in H_2SO_4 medium.The fading in color is directly proportional to the amounts of chromium.The maximum absorption is at 550?nm and the apparent molar absorptivity is 2.33×10~4?L·mol~(-1)·cm~(-1).The linear range is 0～1.2?mg/L of Cr(VI).The method has been applied to the determination of trace chromium in soil with satisfactory results.

Key concepts: Molar absorptivity, Chromium, Spectrophotometry, Chemistry, Trace Amounts, Color reaction, Absorption (acoustics), TRACE (psycholinguistics)

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