GB/T 6730.34-2017(\u82f1\u6587\u7248)
铁矿石 锡含量的测定 邻苯二酚紫-溴化十六烷基三甲胺分光光度法
HG/T 5842\uff5e5844-2021
GB/T 223.45-1994
Methods for chemical analysis of iron, steel and alloy—The cupral separation-xylidyl blue Ⅱphotometric method for the determination of magnesium content
GB/T 1832-1979
Determination of magnesium oxide content in tin concentrates--Xylidyl blue Ⅱ photometric method
GB/T 6900.7-1986
Fireclay and high-alumina refractories—Determination of magnesium oxide content—Xylidyl blue Ⅰ-CTAB photometric method