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

从1M以下的硝酸溶液中，铋(III)被负载硫氰酸酯的硅胶定量吸附，并用含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0.1g L。在流动注射系统中引入了填充0.1g硫氰酸酯的微型色谱柱。将15ml的样品溶液送入色谱柱，用含5%硫脲的2M盐酸通过色谱柱，用流动池测定铋的吸光度，聚氯三氟乙烯树脂在pH值为3~6时吸附一些金属络合物，如铜、镉、铁(III)和锌-8-喹啉。络合物或金属用甲醇或0.1M盐酸洗脱。另一方面，铜(II)-8-喹啉磺酸盐以离子缔合物的形式与四丁基阳离子吸附在树脂上。随着树脂与络合物之间疏水相互作用的增加，树脂的吸附能力似乎也随之增加。利用这些性质，用SIMPLE方法从加入8-喹诺酮磺酸盐和四丁基铵阳离子的样品溶液中预富集铜。采用柱法，在pH<2.0的条件下，甲壳素-CS_2定量吸附~(99)T；~(99)T；~(99)Tc。假定氚与CS_2还原为低价态，并与S原子形成络合物。99m&Gt；Tc的直接洗脱似乎很困难，但在含有0.5g过氧二硫酸盐的1M硫酸中加热保留99m&Gt；Tc的甲壳素-CS_2 10min，可洗脱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.