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用石墨炉原子吸收法直接测定钨产品中Ａｌ等１２个杂质元素．考察了试样在各种溶解介质的溶解速度、效果、背景值、空白值及对各分析元素信号的影响，发现柠檬酸铵－氨水体系对各元素（除Ａｌ外）均适用，而Ａｌ最宜用酒石酸－氨水作溶解剂．研究了钨基体对各元素信号的影响及用钨涂层热解管消除干扰的方法，可用纯标准系列作校准曲线，方法检出限（μｇ／Ｌ，以３σ计）Ａｌ为１．４３，Ａｓ为０．６５，Ｂｉ为３．６９，Ｃｄ为０．０６，Ｃｏ为０．３２，Ｃｒ为０．４０，Ｃｕ为０．６４，Ｍｎ为０．１０，Ｎｉ为０．３８，Ｐｂ为０．３８，Ｓｂ为０．４３和Ｓｎ为１．０３．通过ＷＯ３标准样（ＢＹＧ１２０１－１～３）的验证，其分析结果与推荐值吻合，相对标准偏差为１．２％～５．６％，实际样品的回收率在８９％～１１０％之间．
Direct Determination of 12 Impurity Elements Al in Tungsten Products by Graphite Furnace Atomic Absorption. The dissolution rate, effect, background value, blank value of the sample in various dissolution media and the influence on the signal of each analytical element were investigated. It was found that the ammonium citrate-ammonia system was suitable for all elements except Al, Tartaric acid should be used - ammonia as a dissolving agent. The influence of tungsten matrix on the signal of each element and the method of eliminating the interference with the pyrolytic coating of tungsten coating were studied. Pure standard series was used as calibration curve. The detection limit (μg / L, 3σ) of Al was 1.43, As was 0.65, Bi was 3.69, Cd was 0.06, Co was 0.32, Cr was 0.40, Cu was 0.64, Mn was 0.10, Ni was 0.38 and Pb was 0.38, Sb of 0.43 and Sn of 1.03. Through the validation of WO3 standard samples (BYG1201-1 ~ 3), the analytical results are consistent with the recommended values, with relative standard deviations of 1.2% -5.6% and actual sample recoveries of 89% -110%.