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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 8151.21-2017 |
Methods for chemical analysis of zinc concentrates—Part 21：Determination of thallium content—Inductively coupled plasma mass spectrometry and inductively coupled plasma-atomic emission spectrometry 锌精矿化学分析方法 第21部分：铊量的测定 电感耦合等离子体质谱法和电感耦合等离子体-原子发射光谱法 |
China National Standards 21：Determination |
 English PDF |
| GB/T 13747.21-2017 |
Methods for chemical analysis of zirconium and zirconium alloys—Part 21：Determination of hydrogen content—Inert gas fusion-infrared absorption or thermal conductivity method 锆及锆合金化学分析方法 第21部分：氢量的测定 惰气熔融红外吸收法/热导法 |
China National Standards 21：Determination |
English PDF |
| GB/T 3780.21-2016 |
Carbon black—Part 21：Determination of sieve residue—Water washing method 炭黑 第21部分：筛余物的测定 水冲洗法 |
China National Standards 21：Determination |
English PDF |
| GB/T 20975.21-2008 |
Methods for chemical analysis of aluminium and aluminium alloys - Part 21：Determination of calcium content Flame atomic absorption spectrometric method 铝及铝合金化学分析方法 第21部分：钙含量的测定 火焰原子吸收光谱法 |
China National Standards 21：Determination |
English PDF |
| GB/T 3780.21-2006 |
Carbon black―Part 21：Determination of sieve residue for rubber compounding ingredients―Water washing method 炭黑 第21部分：橡胶配合剂筛余物的测定 水冲洗法 |
China National Standards 21：Determination |
English PDF |
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