氟化电热蒸发进样电感耦合等离子体原子发射光谱法直接测定水样和血清中铝

Direct Determination of Trace Aluminium in Wa-ters and Serum Samples by Electrothermal Vaporiza-tion-Inductively Coupled Plasma-Atomic EmissionSpectrometry with Polytetrafluoroethylene Slurry asFluorinating Agent

本文提出了一种快速、灵敏和直接测定血清和水样中痕量铝的ＩＣＰ－ＡＥＳ方法。方法基于以聚四氟乙烯为氟化剂。促进铝在石墨炉中的蒸发。研究了铝的蒸发行为，考察了共存元素的干扰，提出了铝的蒸发机理。该法测定铝的检出限为０．５ｎｇ／ｍＬ，ＲＳＤ为２．２％（ｎ＝９，Ａｌ浓度为０．２μｇ／ｍＬ），线性范围达４个数量级。采用本法直接测定了血清和自来水中的痕量铝，其分析结果和标准参考物质标定值吻合很好。

A sensitive,rapid and accurate method for the di-rect determination of aluminium in waters and serumsamples has been developed.Polytetrafluoroethylene(PTFE) was used as the fluorinating agent to im-prove the vaporization of aluminium. The ICP dis-charge and ETV operating conditions were optimizedexperimentally.The interferences of coexisting ele-ments and fluorinating vaporization behavior of Alwere studied,and the fluorinating vaporization mecha-nism was proposed. The detection limit of this methodwas 0.5ng/mL and the RSD was 2.2%at the Al ofconcentration 0.2μg/mL. The proposed method hasbeen applied to the direct determination of Al in wa-ters and human serum samples. The resuIts obtainedare in good agreement with the reference results.