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锡青铜中铅锌的测定,一般多采用氰化钾掩蔽,甲醛解蔽的络合滴定法。由于使用氰化钾和铅元素原子量很大,给络合滴定带来的误差也随着增大。某些无氰分析法是有效的,但亦具有试剂难得,有的操作较繁琐,试剂用量较大等不足之处。为此,我们试验了在酒石酸存在下,以硫氰酸钠分离铜,一份试液以邻菲绕啉掩蔽干扰元素,以二甲酚橙为显色剂,于 PH 5.5比色测铅;另一份试液于 PH 5.5以 EDTA 完全络合铅锌,以邻菲绕啉释放法而测锌,收到一定效果。
Tin and lead in the determination of bronze, the general use of more potassium cyanide concealment of formaldehyde complex titration method. Due to the large atomic weights of potassium cyanide and lead used, the error to the complexometric titration increases. Some non-cyanide analysis is effective, but also has a rare reagent, and some cumbersome operation, larger reagent dosage and other deficiencies. For this purpose, we tested the separation of copper with sodium thiocyanate in the presence of tartaric acid, a test solution with phenanthroline to mask interfering elements, xylenol orange as chromogenic reagent, and colorimetric determination of lead at pH 5.5; Another test solution at pH 5.5 with EDTA fully complex lead and zinc, phenanthroline release method and zinc measured, received some results.