STUDY OF THE CHEMILUMINESCENCE REACTION SYSTEM OF Cr(III)- LUMINOL-H_2O_2 AND ITS ANALYTICAL APPLICATION

Determination of microamounts of chromium in titanium alloy by the chemiluminescence method was described in this paper. The sample was decomposed and dissolved by fluoroboric acid. The matrix element together with those interferring elements were masked by EDTA and fluoride, and the chromium content in the sample was determined directly in the sample solution without any separation. The chemiluminescence reaction was carried out in the YHF 1 Liquid Phase Chemiluminescence Analyzer, using the Cr(Ⅲ) Luminol H 2O 2 reaction system. Linear relationship between the chemiluminescence intensities and the concentrations of chromium(Ⅲ) ion was obtained in the range of 10 -9 ～10 -6 mg of Cr(Ⅲ) per liter of solution. The limit of detection was found to be 10 -11 ～10 -9 g·ml -1 . The proposed method was characterized by its sensitivity, rapidity and simplicity.