求大侠翻译一下这句英文，顺便帮我解释一下这个啥意思。这个什么当量质量比？怎么算出来，过硫酸根比上氧分子是12呢？？Since the equivalent weight ratio
of S2O8 2- to O2 is 12, the mass ratio of S2O8 2- to the product of 12 and initial COD (S2O8 2-:12COD) was used to indicate the S2O8 2-dose in this study.
[ Last edited by yinzhen015 on 2012-10-10 at 09:57 ]
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