电感耦合等离子体质谱法同时测定铜铅锌矿石中微量元素镓铟铊钨钼的干扰消除

Elimination of Interference in Simultaneous Determination of Trace Ga,In,Ta,W and Mo in Copper,Lead and Zinc Ores by Inductively Coupled Plasma-Mass Spectrometry

对电感耦合等离子体质谱法同时测定铜矿石、铅矿石和锌矿石中镓、铟、铊、钨和钼量时,基体效应和主量元素铜、铅、锌对测量的干扰情况及可能的消除方法进行试验,结果表明,溶液中共存小于200μg/mL锌对上述微量元素的测量没有干扰;溶液中共存大于50μg/mL的铜对镓、铟、铊、钨、钼的测量有负干扰,共存大于100μg/mL铅对钨的测量有正干扰,对钼的测量有负干扰,采用钪、铼、镧混合内标或基体匹配可以消除这些干扰;溶液中共存大于20μg/mL的铅对铊的测量有正干扰,选择203Tl为测量质量数,可使耐受铅的干扰浓度提高到50μg/mL,铅对铊测量的干扰可以采用校正系数法或基体匹配进行校正或消除。

A method for correctioin and elimination of interference from matrix and major elements in simultaneously determination of Ga,In,Ta,W and Mo in copper,lead and zinc ores by inductively coupled plasma-mass spectrometry was developed.Interferences from matrix and major elements on the determination were systemically studied.The results showed that 1） when the concentration of Cu or Pb in the sample solution was 200 μg/mL,no interference from Zn on the determinatioin of the elements above was observed.2） Cu with concentration of 50 μg/mL in the solution caused the negative interference on the determination of Ga,In,Ta,W and Mo.3） Pb with concentration of 100 μg/mL produced the positive and negative interference on W and Mo,respectively,and the interference couled be eliminated by Sc-Re-La mixed internal standardization or matrix matching method.4） Pb with concentration of 20 μg/mL caused the positive interference on the determination of Tl and the interference could be effectively relieved or eliminated by selecting 203Tl as measurement isotope and using matrix matching method or correction coefficient method.