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一、镍的测定1、称取脱水后的含水污泥2.000g 于300ml 烧杯中,加双氧水20ml,加热煮沸。2、加入7%氢氧化钠溶液,使形成 Ni(OH)_2Cu(OH)_2沉淀与 CrO_4~-分离。3、用定量滤纸过滤,加水洗涤数次,保留滤液[A]。4、用1:1热 HCl 滴加到滤纸上,使溶解完全。在滤液中添加柠檬酸2g,加热,搅拌,溶解完全。5、稍冷却,用1:1氨水中和呈兰色溶液,再用稀盐酸酸化溶液至微酸性,加热近沸,加入2%
First, the determination of nickel 1, weighed dehydrated aqueous sludge 2.000g 300ml beaker, add hydrogen peroxide 20ml, heated to boil. 2, adding 7% sodium hydroxide solution, so that the formation of Ni (OH) _2Cu (OH) _2 precipitate and CrO_4 ~ - separation. 3, with quantitative filter paper, washed with water several times, keep the filtrate [A]. 4, with 1: 1 hot HCl drops on the filter paper, so that dissolved completely. In the filtrate was added citric acid 2g, heating, stirring, dissolved completely. 5, a little cooling, neutralized with 1: 1 ammonia solution was a blue solution, then dilute hydrochloric acid solution to slightly acidic, heated near boiling, add 2%