【摘 要】
：
火焰原子吸收法以其灵敏度高、选择性好等优点而广泛应用于各种基体中微量金属元素的测定,而不用于直接测定Cl-.本文提出了采用火焰原子吸收法间接测定混凝土外加剂中微量Cl-
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火焰原子吸收法以其灵敏度高、选择性好等优点而广泛应用于各种基体中微量金属元素的测定,而不用于直接测定Cl-.本文提出了采用火焰原子吸收法间接测定混凝土外加剂中微量Cl-的方法,在待测液中加入过量的Ag+标液,通过测定与Cl-定量反应后剩余的Ag+量从而换算出Cl-的含量,本法进行了测定最佳酸度试验、精密度试验、在样品中加入Cl-标准溶液回收试验,回收率为96%～104%.经过实际样品测定,证明该方法具有样品预处理手续简单、测定周期短、干扰小等优点,最适合于测定基体较为复杂的混凝土外加剂中的微量Cl-.称取样品0.05～2 g,溶解后, 用硝酸调节酸度,加入与之对应的Ag+标准溶液,放置2 h过滤后即可测定,所用仪器为澳大利亚GBC902型原子吸收光谱仪.
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