意义及用途

4.1 Mercury is a toxic substance and is also harmful if present in caustic soda and caustic potassium used in some manufacturing processes. It therefore needs to be controlled as a possible pollutant. These test methods provide a way to measure mercury content of caustic soda and caustic potassium in liquids and solids.

ASTM E538-2017 烧碱中汞的标准测试方法 (氢氧化钠) 和苛性钾 (氢氧化钾)

步 1: 范围

1.1 These test methods include routine determination of mercury and anhydrous caustic soda in solid, flake, ground and bead forms in caustic soda and caustic potassium solutions by flameless atomic absorption method.

1.2 The two test methods are described as follows: Test method A uses an alkaline reducing agent to analyze the sample directly, and the detection limit is 0.1ppb (ng/g). Test method A was developed using caustic soda and caustic potassium salts. Test method B, which requires pre-neutralization of the sample followed by permanganate oxidation followed by analysis with an acid reducing agent, has a lower detection limit of 0.01ppm (μg/ g). Test method B was developed using caustic soda.

1.3 查看当前的安全数据表 (安全数据表) 有关毒性的详细信息, 急救程序和安全预防措施.

1.4 以 SI 单位表示的值应视为标准值. 本标准不包含其他计量单位.

1.5 本标准并非旨在解决所有安全问题 (如果有的话) 与其使用相关. 本标准的使用者有责任建立适当的安全和健康实践，并在使用前确定监管限制的适用性. Specific hazards are described in sections 7 和 18.

1.6 该国际标准基于国际公认的标准化原则 “关于国际标准制定原则的决定, 指南和建议” 世界贸易组织技术性贸易壁垒委员会发布 (技术性贸易壁垒).