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样品用盐酸-硝酸-高氯酸-氢氟酸分解,电感耦合等离子体发射光谱法测定长石中K、Na、Ca、Mg、Al、Ti、Fe;用重量法测定灼烧减量;二氧化硅的含量用差减法计算求得。方法检出限为0.82~3.41ug/g,经国家一级标准物质GBW03116和GBW03134验证,本方法测定值的相对误差(RE)为-3.70%~6.67%,精密度(RSD,n=12)为0.72%~5.57%,电感耦合等离子体发射光谱法测定的结果与原子吸收法、光度法、容量法测定的结果基本无差异,差减法计算出二氧化硅的结果与动物胶凝聚重量法的结果相吻合,本方法可以满足长石中主次元素的准确测定。
Samples were analyzed by inductively coupled plasma atomic emission spectrometry with hydrochloric acid-nitric acid-perchloric acid-hydrofluoric acid for the determination of K, Na, Ca, Mg, Al, Ti and Fe in feldspar; The content of silicon oxide was calculated by subtraction method. The detection limit of this method was 0.82 ~ 3.41ug / g. The relative error (RE) of this method was -3.70% ~ 6.67% and the precision (RSD, n = 12) was verified by GBW03116 and GBW03134, Is 0.72% ~ 5.57%. The results of inductively coupled plasma atomic emission spectrometry are basically the same as the results of atomic absorption spectrophotometry and volumetric method. Difference subtraction method is used to calculate the results of silica and animal glue coagulation gravimetric method The results are consistent with the method to meet the accurate determination of primary and secondary elements in feldspar.