GB/T 23943-2009 无机化工产品中六价铬含量测定的通用方法 二苯碳酰二肼分光光度法 Inorganic chemicals for industrial use—General method for the determination of chromium(Ⅵ) content—1 5-Diphenylcarbohydrazide spectrophotometric method
Inorganic chemicals for industrial use—General method for the determination of chromium(Ⅵ) content—1 5-Diphenylcarbohydrazide spectrophotometric method