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
磷混合酸
酸—酸银溶液进行回流操作可极大地缩短回流时间，提高
析速
，得到满意结果。
(
)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.
改用磷混合酸酸—酸银溶液进行回流操作可极大地缩短回流时间，提高析速，得到满意结果。
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