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在空气中允许的氯化氫浓度是多少？

返回打印发布时间：2022/5/25 点击：16857

在空气中允许的氯化氫浓度是多少？

空气中的氯化氫多以气体或盐酸雾的状态存在。氯化氫气体和空气中水蒸气作用形成的盐酸雾，呈强酸性，对呼吸系统有刺激作用，刺激上呼吸道粘膜，引起支气管炎，出现咳嗽、胸闷、头晕等症状，引起牙齿疾病。

空气中允许的氯化氫的最高浓度为0.01毫克/升。氯化氫的水溶液称为盐酸，最高浓度为43.4%；实验室常用浓盐酸浓度为38%，相对密度为1.19。含有20.24%氯化氫的水溶液即使在110沸腾，组成也不变，是共沸混合物。

测定空气中氯化氫浓度的方法有硫氰酸汞比色法和离子选择性电极法等。硫氰酸汞比色法及离子选择性电极法均具有准确、灵敏、快速、简便等特点，在国内外广泛采用。但都是氯化氫的非特异性反应，干扰物多，测定氯离子量。用硝酸处理的聚氯乙烯过滤器提取空气中的氯化物，氯化氫气体在过滤器上的滞留少，容易被后来浸渍过碱性溶液的滤纸吸收，可以分别测定空气中的氯化物和氯化氫。该方法已被推荐作为居住区大气氯化氫卫生检测的标准方法。

国家有关规定对氯化氫在大气中的浓度有严格的规定。相关企业应做好副产氯化氫的排放控制和回收工作。

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