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在硫磷混酸中,用硫酸亚铁铵标准溶液滴定高价铬。然后加入过量的硫酸亚铁铵标准溶液与硝酸作用。过量的硫酸亚铁铰溶液,用重铬酸钾标准溶液滴定。一试剂硫磷混酸:水700ml,硫酸150ml,磷酸150ml;苯代邻位氨基苯甲酸:0.2%:亚铁邻菲啰啉指示剂:3%,称邻菲啰啉3克,加水100ml,再加几滴0.1N的硫酸亚铁铵。二分析方法吸取镀液5ml于100ml量瓶中,稀至刻度。吸取5ml于300ml锥形瓶中,加硫磷混酸20ml,苯代邻位氨基苯甲酸5滴,用硫酸亚铁铵标准溶液(0.1N)滴
In parathion mixed acid, ferrous ammonium sulfate standard titration of high-priced chromium. Then add an excess of ammonium ferrous sulfate standard solution with nitric acid. Excess iron sulfate hinge solution, titration with potassium dichromate standard solution. A reagent sulfur and phosphorus mixed acid: water 700ml, sulfuric acid 150ml, phosphoric acid 150ml; Benzene o-aminobenzoic acid: 0.2%: ferrous phenanthroline indicator: 3%, said phenanthroline 3 grams, add water 100ml, and then Add a few drops of 0.1N ammonium ferrous sulfate. Two analytical methods Pipette 5ml in 100ml volumetric flask, dilute to the mark. Pipette 5ml in 300ml conical flask, add 20ml of phosphoric acid and phosphoric acid, benzoate 5 amino acid ortho-benzoic acid, ferrous ammonium sulfate standard solution (0.1N) drops