Determination of phosphorus in ferrovanadium by high resolution continuum source atomic absorption spectrometry
WANG Yong, ZHONG Li, YANG Tao, SHI Zong-you
Product Quality Supervision and Testing Institute of Panzhihua, National Quality Supervision and Testing Center of Vanadium and Titanium Products, Panzhihua 617000, China
Abstract：Since the resonance line of P (178 nm) is in ultraviolet vacuum region, it is difficult to directly determine P by flame atomic absorption spectrometry. However, P could generate a series of PO diatomic molecule absorption spectra in acetylene/air flame with proper proportion, so P could be quantitatively analyzed by continuum source atomic absorption spectrometry.After the sample was fully dissolved with nitric acid and hydrochloric acid by heating, a determination method of P in ferrovanadium by high resolution continuum source atomic absorption spectrometry was established in air-acetylene flame with proper proportion using PO 327.04 nm as analytical line. The optimal working parameters of high resolution continuum source atomic absorption spectrometer were obtained: the flow ratio of acetylene to air was 0.16; the height of combustion head was 12 mm; the integral pixel was 9 pixl. The results showed that the mass concentration of P in range of 5.0-80 mg/L had good linearity to the absorbance. The linear equation was y=0.000 8 x+0.001 9 with correlation coefficient of r=0.999 5. The detection limit of method was 1.0 mg/L. The interference test of coexisting elements in sample indicated that the matrix elements including V and Fe had no interference. Ca and Mg in the sample had interference with the determination. However, Al in sample could react with Ca and Mg to form stable CaAl2O4 and MgAl2O4 compounds, thus eliminating the interference. The proposed method was applied to the determination of P in certified reference material and actual sample of ferrovanadium. The results were basically consistent with the certified values. The relative standard deviations (RSD, n=11) were between 1.9% and 4.4%.
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WANG Yong, ZHONG Li, YANG Tao, SHI Zong-you. Determination of phosphorus in ferrovanadium by high resolution continuum source atomic absorption spectrometry. , 2016, 36(3): 1-5.
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