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土壤代换性钙、镁测定多采用EDTA滴定法及原子吸收法.EDTA 法测钙、镁的精度不够理想,滴定有色的土壤浸出液也有一定困难;原子吸收法因有磷酸根等干扰离子的影响,需加入锶、镧等释放剂来克服干扰.近年来用电感耦合等离子体光谱(简称TCP)法测定土壤代换性钙、镁,方法灵敏、准确,手续简便.干扰少,测定速度快,已成为较常用的方法.本文用顺序扫描ICP法测定土壤代换性钙、镁,对分析条件进行了选择,测得溶液中检出限分别为:Ca0.09ppm,Mg0.01ppm;回收率分别为:Ca98～102%,Mg98～100%;相对标准偏差分别为:Ca0.64%(n=11),Mg0.65%(n=11).土壤浸出液不经任何处理,直接用ICP测定,方法简便快速,分
Soil replacement calcium and magnesium determination using EDTA titration and atomic absorption spectrometry .EDTA method for the determination of calcium and magnesium accuracy is not ideal, titration of colored soil leachate also have some difficulties; atomic absorption method due to the interference of ions such as phosphate , Need to add strontium, lanthanum and other release agents to overcome the interference.In recent years, the determination of soil replacement calcium and magnesium by inductively coupled plasma spectroscopy (referred to as TCP) method is sensitive, accurate, simple procedure. Interference less, the determination speed , Has become a more commonly used method.In this paper, the determination of soil replacement Ca and Mg by sequential scanning ICP method, the analysis of the conditions were selected, the detection limit of the solution were: Ca0.09ppm, Mg0.01ppm; Recovery The relative standard deviations were Ca 0.64% (n = 11) and Mg 0.65% (n = 11), respectively.The soil leachate was determined by ICP directly without any treatment , The method is simple and quick, points