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[求助] 硫酸氧钛的规格93%和synthesis grade

本人用硫酸氧钛制备二氧化钛,刚开始用的93%的硫酸氧钛,后来用完了,重新买回来的是synthesis grade的,制备一段时间后发现TiO2含量不同,synthesis grade的TiO2含量要明显低很多,但是两者好像都是分析纯,价格也差不多,那用哪个做原材料制备二氧化钛好呢?制备相同量的TiO2,synthesis grade用的量要多得多,synthesis grade的硫酸氧钛质量分数是多少?
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