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本文用磷酸锡无机离子交换剂制成薄层板,不另加粘合剂,以DMSOHNO_3为混合溶剂系统对四十四种金属离子的薄层层析行为进行了研究。实验结果表明:在混合溶剂系统中,增加硝酸的浓度,磷酸锡交换剂中的交换基电离度降低,许多金属离子的比移值有所增加;当以DMSO-H_2(1:1)为溶剂,除Hg~(2+),Cd~(2+),Cr~(3+)(或Cr~(6+)和贵金属离子外,其它金属离子的比移位接近于零。故选择适当比例的DMSO-HNO_3和DMSO-H_2O为混合溶剂系统,利用磷酸锡对某些金属离子的选择性,可使许多金属离子相互分离。如:Hg~(2+)与Pb~(2+),Cd~(2+)与Pb~(2+),Hg~(2+)与Hg_2~(2+),Pb~(2+)与Zn~(2+),Hg~(2+)与As~(3+)等的分离是成功的。这些离子对环境保护中微量组分的分离和富集具有一定的使用价值。
In this paper, tin phosphate tin inorganic ion exchanger made of thin plate, without additional binder, with DMSOHNO_3 mixed solvent system of forty-four kinds of metal ions thin layer chromatography behavior were studied. The experimental results show that when the concentration of nitric acid is increased in the mixed solvent system, the ionization degree of the exchange groups in the tin-phosphate-tin-phosphate exchangers decreases, and the specific gravity shifts of many metal ions increase. When DMSO-H 2 (1: 1) , Except that the specific shifts of other metal ions except Hg2 +, Cd2 +, Cr3 + (or Cr6 +) and noble metal ions are close to zero, so the appropriate proportion Of DMSO-HNO 3 and DMSO-H 2 O are mixed solvent systems, and many metal ions can be separated from each other by utilizing the selectivity of some tin ions to tin phosphate such as Hg 2+ and Pb 2+, Pb 2+ and Hg 2+ and Hg 2+, Pb 2+ and Zn 2+, Hg 2+ and As ~ (3+), etc. These ions are of value in the separation and enrichment of trace components in environmental protection.