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本试验考查了四种不同树脂的回收,发现国产122螯合型阳离子树脂(水阳酸-苯酚-甲醛)是用于水中痕量元素分析的一种理想材料,在选定的pH,交换柱高等的条件下,122树脂同国外广泛选用的chelex-100树脂相似,具有选择性好,分配系数大,交换速度快,膨胀倍数小的特点,淋洗曲线证明:除铁外,各试验元素洗脱集中,回收完全,没有拖尾现象,此外,122树脂交换容量大(47.84毫克当量/克)有足够大的“始漏量”,可使水样中被研究元素得到10—40倍以上富集,实验证明,122氢型树脂的洗脱过程就是再生过程,无需转型再生,操作简便,快速,优于其它树脂,本文对共存元素的干扰及其干扰的消除进行了详细的研究,在本测定条件下,各类水样经分离-富集-洗脱后,可用火焰原子吸收连续测定ppb级Ca,Pb,Zn,Cd,Mn,Ni,Co,Fe方法实际测定限优于1ppb,各元素的标准偏差分别为:Cu 2.42%,Pb 1.06%,Zn 4.74%,Cd 2.66%,Mn 2.23%,Ni 2.95%,Co 1.16%,Fe9.30%
This test examines the recovery of four different resins and found that 122 chelating cationic resin (hydrocyanic acid-phenol-formaldehyde) is an ideal material for trace elemental analysis in water at selected pH, exchange column Higher conditions, 122 resin with a wide selection of chelex-100 abroad similar to the resin, with good selectivity, the distribution coefficient, exchange speed, expansion factor is small, the leaching curve shows: In addition to iron, the test element wash In addition, the large resin exchange capacity of 122 (47.84 mg eq / g) has a large enough “start-up volume” to allow the element to be studied to be 10-40 times more abundant Experiments show that the elution process of hydrogen-type resin is the regeneration process, without the need of transformation and regeneration. It is simple, rapid and superior to other resins. In this paper, the interference of co-existing elements and the elimination of interference are studied in detail. Pb, Zn, Cd, Mn, Ni, Co, Fe ppb level can be determined by flame atomic absorption after the separation-enrichment-elution, The standard deviations of the elements are respectively Cu 2.42%, Pb 1.06%, Zn 4.74%, Cd 2.66%, Mn 2.23%, Ni 2.95%, Co 1.16%, Fe 9.30%