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GB/T 20975.25-2020
铝及铝合金化学分析方法 第25部分:元素含量的测定 电感耦合等离子体原子发射光谱法
Methods for chemical analysis of aluminium and aluminium alloys—Part 25:Determination of elements content—Inductively coupled plasma atomic emission spectrometric method
GB/T 20975.35-2020
铝及铝合金化学分析方法 第35部分:钨含量的测定 硫氰酸盐分光光度法
Methods for chemical analysis of aluminium and aluminium alloys—Part 35:Determination of tungsten content—Thiocyanate spectrophotometric method
GB/T 223.37-2020
Iron, steel and alloy—Determination of nitrogen content—Indophenol blue spectrophotometric method after distillation separation
GB/T 17360-2020
Microbeam analysis—Method of quantitative determination for low contents of silicon and manganese in steels using electron probe microanalyzer
GB 37483-2019
Minimum allowable values of energy efficiency and energy efficiency grades for rotary aerator in wastewater treatment
GB/T 8704.5-2020
Ferrovanadium—Determination of vanadium content—The ammonium ferrous sulfate titrimetric method and the potentiometric titrimetric method