悬浮液进样-火焰原子吸收光谱法测定聚氯乙烯中微量镁

Determination of micro magnesium in polyvinyl chloride by flame atomic absorption spectrometry with suspension sampling

把悬浮液技术应用于火焰原子吸收光谱法,成功地测定了聚氯乙烯中的镁。将过筛聚氯乙烯样品悬浮在琼脂-乙二醇溶液中制成悬浮液,于适量样品悬浮液中,加入释放剂Sr2+配制成试液,喷入空气 乙炔火焰进行镁的测定。对悬浮剂的选择、干扰的消除、检出限及线性范围进行了考察。测定结果的相对标准偏差小于4 2%,加标回收率为96 2%～105 7%。方法简便、准确。

The suspension sampling technique has been applied to determine magnesium in polyvinyl chloride by flame atomic absorption spectrometryPolyvinyl chloride samples sifted were suspended in agarethylene glycol solution and made into suspensionThe test solutions prepared by adding releasing agent Sr in an appropriate ammount of the suspension were injected into airacetylene flameThe choice of suspension agents,the elimination of interference,the linearity range and the detection limit were studiedThe relative standard deviations are less than 42%The recoveries are 962%-1057%This method is convenient and accurate