銅合金中鋅的极譜测定,虽然方法很多,但多以电解分离銅,或以盐酸羟胺将銅还原成一价,再通乙炔使銅沉淀,滤出,比較不方便。我們試驗了用铁粉将銅置換出来,再以过氧化氢氧化二价铁到三价后,用濃氨水沉淀铁,过滤作图测定之。效果良好。一、試剂 (1)盐酸:比重1.19;1:5;1%。 (2)硝酸:比重1.42。 (3)过氧化氢:30%。 (4)还原铁粉(不含鋅者)。 Copper alloy zinc polarographic determination, although many ways, but more to electrolytic separation of copper, or hydroxylamine hydrochloride copper will be reduced to a monovalent, and then through copper acetylene precipitation, filter out, more inconvenient. We tested the replacement of copper with iron powder out, then the oxidation of divalent iron to trivalent hydrogen peroxide, with concentrated ammonia precipitation of iron, filtered and measured. Good effect. A reagent (1) hydrochloric acid: specific gravity 1.19; 1: 5; 1%. (2) Nitric acid: specific gravity 1.42. (3) Hydrogen peroxide: 30%. (4) reduced iron (zinc-free).