Determination of calcium, magnesium, aluminum, manganese and iron in industrial sodium bichromate by inductively coupled plasma atomic emission spectrometry
ZHANG Yan-cui, FANG Yan-xia, QI Bai-yu
Physical Testing and Chemical Analysis Center, Northwest Research Institute of Mining & Metallurgy, Baiyin 730900, China;
Abstract：The accurate determination of impurity elements in industrial sodium dichromate is great significance to judge the production process and application quality of industrial sodium dichromate. The perchloric acid was added into sodium dichromate solution and heated to fuming. Then hydrochloric acid was added dropwise to remove chromium in the form of chromyl chloride gas (CrO2Cl2). The influence of matrix effect was eliminated by preparing the calibration curves with Na matrix matching method. Under the selected working conditions of instrument, Ca 315.887nm, Mg 285.213nm, Al 167.076nm, Mn 293.930nm and Fe 259.940nm were selected as the analytical lines. The content of Ca, Mg, Al, Mn and Fe in industrial sodium dichromate was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Thus the determination method of Ca, Mg, Al, Mn and Fe in industrial sodium dichromate was established. The correlation coefficients of calibration curves for Ca, Mg, Al, Mn and Fe were all higher than 0.999. The detection limits of elements were between 0.003μg/mL and 0.027μg/mL. Calcium, magnesium, aluminum, manganese and iron in industrial sodium bichromate were determined according to the experimental method. The spiked recoveries were between 96% and 104%. The relative standard deviations (RSD, n=8) of determination results were between 1.3% and 2.3%. The found results were consistent with those obtained by flame atomic absorption spectrometry (FAAS).
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