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用钨酸盐涂镀石墨管和NH4NO3基体改进剂直接测定血清中微量锗,消除基体干扰、显著改进灵敏度,准确度和精密度、相对标准偏差小于3?61.“,”Using a tungstate?coated graphite tube,trace germanium in serum samples was determined by Zeeman graphite AAS with NH?4NO?3 as a matrix modifier.The sensitivity of Ge can be significantly improved.The matrix interference has been removed.The relative standard deviation is less than 3?61%.The method is simple,rapid and accurate.??