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[求助] 光度滴定误差分析求教

用光度滴定法测定硫酸软骨素含量,1g/l CPC标准溶液为滴定液,分别用水跟加吐温-80的缓冲液为介质进行滴定,结果同一样品,每日的结果差好几个百分点?缓冲液作介质的比水作介质的误差要小?不知道影响误差的因素在哪里?求教光度滴定发误差分析?
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