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Decoloring spectrophotometric method for determination of Cr(VI) with chrome blue black-R

Zhuang Xiao-juan

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Abstract

In sulfuric acid medium,chrome blue black-R is oxidized by Cr() to produce decoloring and the decoloring degree of chrome blue black-R has a linear correlation with the concentration of Cr_2O~(2-)_7.Based on this,a new spectrophotometric method for determination of trace chromium() is developed.Beer's law is obeyed in the concentration range of 0～0.80 mg/L for Cr().The apparent molar absorption coefficient is 1.4×10~5 L·mol~(-1)·cm~(-1). This method is easy and rapid,and is applied for the determination of trace chromium in steel sample with satisfactory results.

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What this paper is about

In sulfuric acid medium,chrome blue black-R is oxidized by Cr() to produce decoloring and the decoloring degree of chrome blue black-R has a linear correlation with the concentration of Cr_2O~(2-)_7.Based on this,a new spectrophotometric method for determination of trace chromium() is developed.Beer's law is obeyed in the concentration range of 0～0.80 mg/L for Cr().The apparent molar absorption coefficient is 1.4×10~5 L·mol~(-1)·cm~(-1). This method is easy and rapid,and is applied for the determination of trace chromium in steel sample with satisfactory results.

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Available abstract

In sulfuric acid medium,chrome blue black-R is oxidized by Cr() to produce decoloring and the decoloring degree of chrome blue black-R has a linear correlation with the concentration of Cr_2O~(2-)_7.Based on this,a new spectrophotometric method for determination of trace chromium() is developed.Beer's law is obeyed in the concentration range of 0～0.80 mg/L for Cr().The apparent molar absorption coefficient is 1.4×10~5 L·mol~(-1)·cm~(-1). This method is easy and rapid,and is applied for the determination of trace chromium in steel sample with satisfactory results.

Key concepts: Chromium, Sulfuric acid, Chemistry, Molar absorptivity, Spectrophotometry, Nuclear chemistry, Correlation coefficient, Analytical Chemistry (journal)

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