石墨炉原子吸收法测定麦芽粉中的锗和硒

DETERMINATION OF GERMANIUM AND SELENIUM IN MALT POWDER BY GFAAS

本文叙述了平台石墨炉原子吸收法测定麦芽粉中的锗和硒，采用Ｐｄ＋Ｎｉ和Ｐｄ基体改进剂，使锗和硒的灰化温度分别提高到１４００和１２００℃，有效地消除了基体干扰。方法特征量为３１ｐｇ（Ｇｅ）和２３ｐｇ（Ｓｅ），检出限为２８ｐｇＧｅ和６２ｐｇＳｅ（３σ）。对含２２～１１０μｇ／ｇＧｅ和１８～３５μｇ／ｇＳｅ的样品测定，相对标准偏差为Ｇｅ３．７～５．６％（ｎ＝９），Ｓｅ４．３～６．５％（ｎ＝９），回收率在９０～１０５％之间。

A method for determination of germanium and selenium in malt powder has been developed by graphite furnace atomic absorption spectrometry with L′vov platform.While (Pd+Ni) and Pd were used as matrix modifiers,the ashing temperatures of Ge and Se were increased to 1400 and 1200℃ respectively,and the matrix inferences were removed.The characteristic masses are 31pg Ge and 23pg Se(0 0044A),the detection limits are 28pg Ge and 62pg Se(3σ),the precisions (n=9) are 3 7—5 6%(Ge) and 4 3—6 5%(Se) and the recoveries are among 90—105%.