本演示介绍了饮用水中卤乙酸（HAA9）分析过程中的质量控制方面。本演示重点介绍了两种方法，重氮甲烷（标准方法6251B，EPA方法552）和酸性甲醇（EPA方法522.2），并介绍了衍生效率和方法的优化。生物降解和氯猝灭对HAA稳定性的影响也包括在内。

This presentation deals with aspects of quality control during the analysisof haloacetic acids (HAA9) in drinking water. The presentation focuses on two methods,diazomethane (Standard Method 6251B, EPA Method 552), and acidic methanol (EPA Method 522.2) and addresses the derivatization efficiency and optimization of the methods. The impact of biodegradation and chlorine quenching onHAA stability are also covered.