Preconcentration and Characterization of Trace Metals by the Use of Various Absorbents

从小于1 M的硝酸溶液中定量吸附含硫脲的硅胶，用含3%硫脲的盐酸洗脱。然后用氢化物发生原子吸收光谱法测定铋，灵敏度为0.1 μ g l ^<-1>。在流动注射系统中加入0.1 g硫代苷- sg填充的微型柱。15ml的样品溶液在柱中流动后，用2 M含5%硫脲的盐酸通过柱，然后用流动池测量bi -络合物的吸光度。聚三氟氯乙烯树脂吸附了一些金属配合物，如Cu、Cd、Fe（III）和zn -8-喹啉酸盐。配合物或金属用甲醇或0.1 M盐酸洗脱。另一方面，Cu(II)- 8-喹啉醇磺酸盐以四丁基铵阳离子离子配合物的形式吸附在树脂上。吸附性能似乎随着树脂与配合物之间疏水相互作用的增加而增加。利用这些性质，用简单的方法在甲壳素中加入8-喹啉-氨基磺酸盐和四丁基铵阳离子cs_2，将铜从样品溶液中预富集。甲壳素cs_2在pH<等于或小于>2.0时定量吸附^<99m> Tc。假定锝与CS_2还原到低价态，并与s原子形成配合物。直接洗脱^<99m>Tc似乎很困难，但保留^<99m>Tc的几丁质cs_2在含有0.5 g过硫酸根的1 M硫酸中加热10分钟，可以洗脱98%以上的元素。

Bismuth (III) was quantitatively adsorbed on thionalide-loaded silica gel from nitric acid solution of lower than 1 M, and was eluted with hydrochloric acid containing 3% thiourea. Then, bismuth was determined by atomic absorption spectrometry with hydride generation in the sensitivity of 0.1 mug l ^<-1>. The mini-column filled with the thionalide-SG (0.1 g) was introduced in a flow injection system. After 15 ml of a sample solution was flowed in the column, 2 M hydrochloric acid containing 5% thiourea was passed through the column and then the absorbance of the Bi-complex was measured by the use of a flow cell.Poly(chlorotrifluoroethylene) resin adsorbed some metal complexes, such as Cu, Cd, Fe(III), and Zn-8-quinolinolates at pH3-6. The complexes or metals were eluted with methanol or 0.1 M hydrochloric acid. On the other hand, Cu(II)- 8-quinolinol sulfonate was adsorbed on the resin as an ion-associated complex with tetrabutylammonium cation. The adsorbability seems to increase with the increase of hydrophobic inter- action between the resin and complexes. By the use of these properties, preconcentration of copper from a sample solution added with 8-quinoli- nol sulfonate and tetrabutylammonium cation.CS_2 was introduced in chitin by the simple method. The chitin-CS_2 quantitatively adsorbed ^<99m> Tc at pH<less than or equal>2.0 by the column method. It was assumed that technetium was reduced to low valence state with CS_2 and formed a complex with S-atom. The direct elution of ^<99m>Tc was seemed to be difficult, however, above 98% of the element could be eluted by heating the chitin-CS_2 retaining ^<99m>Tc in 1 M sulfuric acid containing 0.5 g of peroxodisulfate for 10 min.