请帮帮翻译一段长话hydrogen peroxide in sodium percar ...? also the active oxygen concentration from hydrogen peroxide in sodium percarbonate can be obtained and accurate volumetric analysis of hydrogen peroxide by reducing ceric salts to cerous salts or by liberating iodine from an iodide, followed by titration with a thiosulfate solution. 如楼上所说,句子结构有问题。整个句子意思为: 来自过碳酸钠中过氧化氢的活性氧浓度可以通过过氧化氢的容量分析得到,该容量分析可通过还原4价铈盐为3价铈盐的铈量法,或者通过氧化碘化物并用硫代硫酸钠溶液滴定释放出的碘的碘量法。查看更多