2009•Applied Chemical IndustryRequires access
Spectrophotometry determination of chromium(III) in Al alloys with chlorophosphonazo(III)-OP systems
Fulan Li
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Abstract
The spectrophotometry using chromium(Ⅲ) reagent as the color developing reagent has been studied.The effects of measuring wave length,addition of chromogenic agent,chromogenic media,acidity,temperature,time and interfering elements on the measured results were studied.The result shows that chlorophosphonazo(Ⅲ) can react with chromium(Ⅲ) to form a stable blue complex on surfactant OP in a medium containing HAc-NaAc.The complex has good absorbance at 620 nm,the method is accurate and efficient.