By replacing sulphoacid and silver sulfate solution by combining acid of sulphoacid and phosphoric acid in the back-flow process,the time is shortened and analysis is quicker.
改用硫磷混合酸代替硫酸—硫酸银溶液进行
操作可极大地缩短
间，提高分析速
，得到满意结果。
By replacing sulphoacid and silver sulfate solution by combining acid of sulphoacid and phosphoric acid in the back-flow process,the time is shortened and analysis is quicker.
改用硫磷混合酸代替硫酸—硫酸银溶液进行操作可极大地缩短间，提高分析速，得到满意结果。
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