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一试剂硫硝混合酸:浓硫酸50毫升及浓硝酸8毫升加入水中,稀释至1升; 钼酸铵:5%的3N硫酸溶液; 抗坏血酸-氯化亚锡混合液:于100毫升3%的抗坏血酸溶液中,加入0.05克氯化亚锡,搅匀(当日新配,如有混浊,需过滤); 铁标准溶液:10mgml~(-1),称取FeNH_4(SO_4)_2·12H_2O 86.32克,溶于水中,加硫酸(1+1)10～20滴,稀释至1升; 磷标准溶液:10μgml~(-1),称取105℃干燥过的Na_2HPO_4 0.4584克,溶于水中,加硫酸(1+1)2毫升,稀释至1升;再将此溶液稀释10倍. 二条件试验 1 抗坏血酸和氯化亚锡加入量的影响:取铁标准
A reagent sulfur sulfur mixed acid: 50 ml of concentrated sulfuric acid and concentrated nitric acid 8 ml added to water, diluted to 1 liter; ammonium molybdate: 5% 3N sulfuric acid solution; ascorbic acid - stannous chloride mixture: 100 ml of 3% Ascorbic acid solution, add 0.05g of stannous chloride, mix well (freshly prepared on the day, if turbid, to be filtered); iron standard solution: 10mgml -1, weighed FeNH_4 (SO_4) _2 · 12H_2O 86.32g, Dissolved in water, add sulfuric acid (1 +1) 10-20 drops, diluted to 1 liter; phosphorus standard solution: 10μgml -1, weighed 105 ℃ dried Na_2HPO_4 0.4584 grams, dissolved in water, add sulfuric acid ( 1 + 1) 2 ml, dilute to 1 liter, and then dilute the solution 10 times two conditions test 1 ascorbic acid and stannous chloride added amount of influence: take iron standard