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To validate the sampling protocol for the analysis of HAs, the impacts of temperature and pH were assessed using purified water fortified with the target HAs. Controlled studies were undertaken at conditions used in the sampling protocol (pH 4.5, 4℃) and at different pH (7.0 and 8.2) and temperatures (4℃ and 22℃) in order to simulate typical variations for drinking water. 验证抽样协议分析的 HAs，温度及 ph 值的影响被评估使用强化目标 HAs 的纯净的水。 使用在采样协议，在 ph 值为 4.5 4℃） 和 （7.0 和 8.2） 的不同 pH 和温度 （4℃ 和 22℃），以模拟饮用水的典型变化的条件下进行一项对照的研究。

The studies

were conducted over 14 days using pH adjusted purified waters fortified with individual HAs. Concentrations were converted to nmol 1^(-1) to verify mass balance. The results indicated that, at the consolidated method sampling conditions (pH 4.5, 4℃), all the target HAs were stable in purified water for up to 14 days. 该研究进行超过 14 天，使用 pH 调节强化个人 HAs 纯净的水。 浓度已将转换为 nmol 1^(-1) 来验证质量平衡。 结果显示，在取样 ph 值 4.5 4℃） 的条件统一方法，目标有了所有在纯净水中稳定达 14 天。

However, at typical drinking water conditions (pH 7.0 and 8.2; cold and ambient temperatures), there were significant variations in the HA stability profiles. The stability decreased at increasing water pH and temperatures and the degradation rates were specific to each species. 但是，典型的饮用水条件 (ph 值 7.0 和 8.2 ； 寒冷和环境温度)，在很大的差异，在医管局稳定性配置文件中。 稳定性下降增加水的 ph 值和温度和降解率是特定于每个种类。

In general, the brominated compounds (BCA, DBA, BDCA, CDBA and TBA) were less stable in water than the chlorinated HAs including CH.

For brevity, only the profiles of the trihalogenated HAs (BDCA, CDBA and TBA) at two conditions (pH 7.0, 22℃; pH 8.2, 4℃) are presented in Fig 4. In concurrence with previous results for chloral hydrate where chloroform was a major degradation product (LeBel and Benoit, 2000), the trihalomethanes were identified as degradation products of the corresponding trihalogenated HAs (Fig. 4A and B). 一般情况下，溴化的化合物 (BCA，DBA、 BDCA、 CDBA 和 TBA) 是不稳定的水，包括 CH.，氯化已比 为简洁起见，仅在两个条件 (ph 值 7.0，22℃ ； pH 82，4℃) 在 trihalogenated HAs (BDCA、 CDBA 和 TBA） 的配置文件显示在图 4 中。 并发与以前的水合氯醛氯仿在那里 （标签和贝努瓦仙芬黛 2000年） 的主要降解产品的结果，在该三卤甲烷被认定为降解产物的相应的 trihalogenated HAs （图 4A 和 B）。

However, the initial molar concentrations of HAs relative to THMs formed are not balanced indicating that other undetected by-products may be formed. Additional data on the stability of the other haloacetaldehydes in water, including the dihaloacetaldehydes (DCA, BCA and DBA) are described elsewhere (Koudjonou and LeBel, 2003). 但是，相对于形成的 THMs HAs 的初始摩尔浓度不是平衡，该值可能形成其他未检测到的副产品。 描述于水包括 dihaloacetaldehydes （DCA、 BCA 和 DBA），其他 haloacetaldehydes 的稳定性上的其他数据 （Koudjonou 和标签，2003年） 的其它地方。After 2 days storage at pH 8.2, 22 C, pH-controlled solutions of DCA, BCA and DBA (10 lg l 1) indicated

that the initial concentrations decreased by 20%, 88% and 76%, respectively. At pH 7.0, 4℃, only moderate decrease (<10%) was observed.

后 2 天存储 ph 值之八点二仙芬黛 22 C，ph 值控制的解决方案的 DCA、 BCA 和 DBA （10 乐金 l 1) 表示初始浓度 20%、 88%和 76%，分别下跌。 ph 值 7.0，4℃，只有适度降低 (<10%) was observed. was=""></10%) was observed.>

At typical drinking water pH (7.0 and 8.2), the HAs readily degraded, particularly at ambient temperature, and THMs were formed from the corresponding trihalogenated acetaldehydes within 24 h storage. These findings further justify the method sampling protocol requirements for water pH adjustment in the field, and for storage of samples at a cold temperature to ensure accurate results. 典型饮用水 ph 值 （7.0 和 8.2），在 HAs 容易退化，特别是在室温下，和 THMs 从相应的 trihalogenated acetaldehydes，24 小时存储中形成。 这些研究结果进一步证明采样，确保准确的结果的字段中的水 ph 值调整和贮存在冷温度样本的协议要求的方法。