抗坏血酸还原钼蓝光度法测定磷,砷的干扰可用硫代硫酸钠掩蔽,这样,磷与砷可以进行联合测定。试验部分一、试剂:硫代硫酸钠溶液:10%,100毫升溶液中加碳酸钠0.2克。钼酸铵溶液:0.25%,每升溶液中加氨水2毫升。硝酸铋溶液:10%,10克硝酸铋,加10毫升硝 Determination of phosphorus and arsenic interference by ascorbate molybdenum blue photometry method can be masked with sodium thiosulfate, so that phosphorus and arsenic can be jointly measured. Experimental part First, the reagent: sodium thiosulfate solution: 10%, 100 ml solution was added sodium carbonate 0.2 g. Ammonium molybdate solution: 0.25%, add 2 ml of ammonia solution per liter of solution. Bismuth nitrate solution: 10%, 10 grams of bismuth nitrate, plus 10 ml of nitrate