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一、试剂: 1.硫硝混酸:每升溶液中含浓硫酸50毫升,浓硝酸8毫升。 2.浓硝酸:比重1.40。 3.酒石酸:10%。 4.三乙醇胺:1:2。 5.氢氧化钠:20%和2%。 6.乙二胺四乙酸二钠(EDTA)标准溶液:0.02M和0.002M。准确称取EDTA7.4452克加水溶解,溶完后在容量瓶中加水稀释为1升,即为0.02M。取0.02M EDTA 100毫升,在容量瓶中加水稀为1升,即0.002M。 7.盐酸:1:1。
First, reagents: 1. sulfur and nitrogen mixed acid: per liter of solution containing 50 ml of concentrated sulfuric acid, concentrated nitric acid 8 ml. 2. Concentrated nitric acid: the proportion of 1.40. Tartaric acid: 10%. 4. Triethanolamine: 1: 2. Sodium hydroxide: 20% and 2%. Disodium ethylenediaminetetraacetate (EDTA) standard solutions: 0.02M and 0.002M. Accurately weighed EDTA7.4452 grams dissolved in water, dissolved in water after the volumetric flask diluted with water to 1 liter, which is 0.02M. Take 0.02M EDTA 100 ml, dilute water in the volumetric flask 1 liter, that is 0.002M. 7. Hydrochloric acid: 1: 1.