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
合酸代替酸—酸银溶液进行回流操作可极大地缩短回流时间，提高分析速
，得到满意结果。
(代)酸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.
改用合酸代替酸—酸银溶液进行回流操作可极大地缩短回流时间，提高分析速，得到满意结果。
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