23 GB/T 1515-1979 錳礦石中磷量的測定 (磷鉬藍吸光光度法) Method for determination of phosphorus content in manganese ores--Phosphrus molybdenum blue photometric method

　　24 GB/T 1516-1979 錳礦石中砷量的測定 (二乙胺硫代甲酸銀吸光光度法) Method for determination of arsenic content in manganese ores

　　25 GB/T 1518-1979 錳礦石中鎳量的測定 (極譜法) Method for determination of nickel content in manganese ores--Polarographic method

　　26 GB/T 1519-1979 錳礦石中銅量的測定 (極譜法) Method for determination of copper content in manganese ores--Polarographic method

　　27 GB/T 1572-1989 煤的結渣性測定方法 Determination of clinkering property of coal

　　28 GB/T 1573-1989 煤的熱穩定性測定方法 Determination of thermal stability of coal

　　29 GB/T 1574-1995 煤灰成分分析方法 Analysis of coal ash

　　30 GB/T 1575-1987 褐煤的苯萃取物產率測定方法 Determination of yield of benzene-soluble extract in brown coal

　　31 GB/T 2559-1981 褐煤蠟熔點測定方法 Lignite wax--Determination of melting point

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