这项研究调查了 测定了氯胺化样品中的卤乙酸（HAA） 受氯化铵（NH<；sub>；4<；/sub>；Cl）使用的影响 美国环保署推荐的氯淬火剂 保护机构方法552.3。可供替代的 还研究了淬火剂和方法。 研究结果表明，使用NH；sub>；4<;/sub>；要保存的Cl 从氯胺化水中获取的HAA样本 可能会导致在 短时间接触（或停留）地点。震级 在实际应用中，这些错误的数量会有所不同 取决于几个因素，包括pH值、反应性 溶解有机物的浓度和 氯胺化点和氯/氨应用。 在各种淬火剂或方法中 经测试，亚砷酸钠和化学计量的 硫酸钠被发现适用于氯胺 但在使用中有一些限制 实际应用。 样品淬火和保存的选择 氯胺化反应中HAA的测定方法 系统必须仔细评估。此外，更好 氯胺化溶液中HAA测定的猝灭法 需要水。包括24个参考文献、图表。

This study investigated how the determination of haloacetic acid (HAA) in chloraminated samples was affected by use of ammonium chloride (NH<;sub>;4<;/sub>;Cl), the chlorine quenching agent recommended in U.S. Environmental Protection Agency Method 552.3. Alternative quenching agents and methods were also examined. Study results showed that using NH<;sub>;4<;/sub>;Cl to preserve HAA samples obtained from chloraminated waters may result in positive errors for samples collected at short contact (or residence) time locations. The magnitude of these errors in practical applications will vary depending on several factors, including pH, reactivity of dissolved organic matter and concentration at the point of chloramination, and chlorine/ammonia application. Among various quenching agents or methods tested, sodium arsenite and stoichiometric amounts of sodium sulfate were found to be appropriate for chloramine samples but have some limitations for use in practical applications. Selection of sample quenching and preservation methods for HAA determination in chloramination systems must be carefully evaluated. In addition, better quenching methods for HAA determination in chloraminated waters are needed. Includes 24 references, figures.