钨盐涂覆-GFAAS法测定肿瘤患者体内痕量锂

Method for the Determination of Trace Li in Serum of Cancer Patients by Tungstate coated Graphite Furnace Atomic Absorption Spectrome try

钨盐涂覆处理石墨管，大幅度提高测定锂的灵敏度。配以（ＮＨ４）２ＳＯ４基体改进剂，消除生物基体干扰。特征浓度５．５３×１０－３μｇ·ｍＬ－１／１％，回收率大于９３．７２％，相对标准偏差小于８．９３％。

Using a tungstate coated graphite tube.The sensitivity of Li was significantly increased and trace Li in serum samples was determined by Zeeman graphite AAS with (NH 4) 2SO 4 as a matrix modifier.The effects of different metal ions and biological matrix were eliminated.The characteristic concentration is 5 53×10 -3 μg·mL -1 /1%.The recovery is greater than 93 72 %. The relative standard deviation is less than 8 93 %.