【摘要】 本文提出了测定铝土矿中12个微量元素的光谱分析方法。石墨粉与SrO按90∶10的比例混和用作缓冲剂。缓冲剂中加入0.02％的Pd和0.01％的Bi₂O₃作内标。试样与缓冲剂按1∶5的比例混和装入碳杯电极中,用交流电弧激发。研究了矿物组份产生的光谱干扰。检测限如下:CuO、PbO、Ga₂O₃和Yb₂O₃为5ppm,NiO、V₂O₅、ZrO₂和Y₂O₃为10ppm;Cr₂O₃和Sc₂O₃为20ppm;Nb₂O₅和La₂O₃为50ppm。变异系数在7—20％之间。与分光光度法和原子吸收法的分析结果对照,结果一致。更多还原

【Abstract】 A rapid and sensitive spectrographic method for the determination of 12 trace elements in bauxite was developed. Graphite powder （S. P.） mixed with SrO in the ratio of 90:10 was used as buffer. Pd（0.02％） and Bi₂O₃（0.01％） was added to the buffer as internal standards. The ratio of sample to buffer was 1:5 by weight. Carbon cup electrodes were filled by sample mixture. A.C. arc was used as excitation source. The spectral interferences caused by mineral composition of bauxite were investigated. The detection limit was as follows. CuO, PbO,Ga₂O₃ Yb₂O₃—5 ppm; NiO, V₂O₅. ZrO₂, Y₂O₃—10 ppm; Cr₂O₃, Sc₂O₃—20 ppm; Nb₂O₅, La₂O₅—50 ppm. The relative standard deviation was 7 20%. Analytical results agreed well with those obtained by spectrophotometric and AAS techni- ques in our laboratory.更多还原