UDC622.341.1:543.06B中华人民共和国国家标准GB6730.1886铁矿石化学分析方法乙酸丁酯萃取-钼蓝光度法测定磷量Methods for chemical analysis of iron oresThe n-butyl acetate extraction-molybdenumblue photometric method for the determinationof phosphorus content1986-08-19发布1987-08-01实施国家标准局发布
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