[Study on applications of heteropoly acids (blue) spectrophotometry to determination of trace elements]

Heteropoly acids can be reduced to the pigmented heteropoly blue. Therefore a reliable method for determination of trace elements can be founded by association with spectrophotometry. At present, heteropoly acids spectrophotometry has made great progress in trace analytical field for its high accuracy, simple instruments and rapidity in detection. In the present paper, the application and research progress of heteropoly acids in the determination of trace elements (P, As, Si and V) are reviewed. The methods include the molybdenum blue method, the heteropoly-basic dye approach, fluorophotometry, the flow injection analysis, atomic absorption spectrophotometry, laser thermal spectrophotometry, etc. Finally, analysis and comparison of these methods are studied.