基体改进剂和L′vov平台技术石墨炉原子吸收光谱法测定全血中铅

Determination of Lead in Whole Blood by Graphite Furnace Atomic Absorption Spectrometry with Matrix Modifier and L′vov Platform

应用基体改进剂和L′vov平台技术 ,石墨炉原子吸收光谱法测定了全血中铅。实验发现 ,使用含磷酸二氢铵 0 6 %、硝酸铵 0 4%的混合溶液作为基体改进剂 ,可使血样样品的灰化温度提高到 90 0℃ ,实际使用灰化温度为 75 0℃ ;用 0 3 %TritionX 10 0稀释血样 ,可代替消化 ,经氘灯校正背景 ,直接测定血样中的铅含量 ,对六份血样分析结果 ,相对标准偏差 3%～ 7% ,回收率 93 %～ 10 6 % ,分析方法的灵敏度特征质量为 6 0pg 1%。

Lead in whole blood has been determined by graphite furnace atomic absorption spectrometry with matrix modifier and L'vov platform. It's found that addition of the mixture solution of 0.6% NH4H2PO4 and 0.4% NH4NO3 as matrix modifier, the ash temperature will increase up to 900 degreesC. 750 degreesC is practically used for ash temperature. D-2 lamp is used for background correction. Lead in whole blood was directly determined after addition of 0.3% Triton X-100 without digestion. The analytical results of six whole samples is satisfactory. The recoveries are 93%-106%. The relative standard deviations are 3%-7%. The sensitivity of characteristic mass is 6.0 pg/1%.