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采用化学提取法对多泥沙河流水体中悬浮物和底质进行了逐级分离,将颗粒态金属Fe、Mn、Zn、Ba、Sr、Co、Ni、Cd和Pb分为可交换态,和碳酸盐结合态,和铁锰结合态,和有机物结合态及残余物五个部分,将分离液进行了ICP-AES分析。根据逐级分离液的性质,本文讨论了ICP中Na、Mg对分析物信号的电离干扰和由溶液中溶质差别而产生的物理干扰。采用溶剂匹配的方法,即使溶液盐分在3—9mg/ml范围内变化。也未发现明显的影响。另外还讨论了Mg、Al、Fe的光谱干扰和各待测元素的检出限随观测高度的变化情况,根据不同观测高度的ICP抗干扰能力和检出能力,折衷地选择了ICP操作条件的观测高度。
Chemical extraction was used to separate the suspended matter and sediment in the sediment stream. The particulate metals Fe, Mn, Zn, Ba, Sr, Co, Ni, Cd and Pb were classified as exchangeable and Carbonate-bound, and ferromanganese-bound, and bound organic matter and residues in five parts, the separation liquid was analyzed by ICP-AES. According to the nature of fractionated liquid, this article discusses the ionization interference of analyte signals by Na and Mg in ICP and the physical interference caused by the solute difference in solution. Solvent-matched methods are used, even if the solution salt varies within the range of 3-9 mg / ml. Also did not find significant impact. In addition, the spectral interferences of Mg, Al, Fe and the detection limits of each element to be measured are also discussed. According to ICP’s anti-interference ability and detection ability at different observation altitudes, the ICP operating conditions are eclectically selected Observation height.