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[求助] 氧化还原电位的计算

对于水质氧化还原电位的测定,在我们用酸度计、铂电极、甘汞电极进行检测,测得的值是负值,仪器说明书上说测得值取绝对值。但在使用国标方法计算时,公式中的Ψind 是按负值还是正值计算????
计算式: Ψn = Ψind + Ψref
式中: Ψn ——被测水样的氧化还原电位,mV;
Ψind ——实测水样的氧化还原电位,mV;
Ψref ——测定温度下饱和甘汞电极的电极电位,mV。
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