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1,10-菲绕啉(phen)在络合滴定中通常作为掩蔽剂和消除指示剂的封闭作用而应用,在多种金属离子的EDTA络合物体系中,用1,10-菲绕啉作为解蔽剂应用选择性地测定某金属离子的事例甚少.在pH5～6的弱酸性介质中,phen与Cu、Cd、Co、Hg、Ni、Zn形成的络合物比相应的EDTA络合物更为稳定。试验证明,在pH5～6时1,10-菲绕啉不但能有效地掩蔽Zn~(2+),且可作为Zn-EDTA络合物的解蔽剂。该反应可在Al-EDTA、Sn-EDTA、Fe-EDTA络合物共存时进行。我们对电镀锡锌合金溶液中Na_2SnO_3·3H_2O、Na_2ZnO_2、Na_2H_2Y·2H_2O三种成份的分析采用增量法,过加一定量的EDTA标准溶
1,10-Phenanthroline (phen) is usually used as a masking agent in the complexation titration and the elimination of the blocking effect of the indicator. The metal complexes of EDTA complexes with various metal ions, 1,10-phenanthroline There are few cases of selective determination of a metal ion as a decoupling agent. In weakly acidic pH 5-6, the complexes of phen and Cu, Cd, Co, Hg, Ni, Compound is more stable. Experiments show that 1,10-phenanthroline can not only mask Zn 2+ effectively at pH5-6, but also act as a debinding agent for Zn-EDTA complex. The reaction can be carried out in the presence of Al-EDTA, Sn-EDTA, Fe-EDTA complex. We analyzed the three components of Na_2SnO_3 · 3H_2O, Na_2ZnO_2 and Na_2H_2Y · 2H_2O in the electroplated tin-zinc alloy solution by using the incremental method, adding a certain amount of EDTA standard solution