关于美国环境保护局（USEPA）修订USEPA的研究现已完成 饮用水中挥发性有机污染物的方法524.2。新方法，草稿 方法524.3，实现了几个重要目标。它有一份修订后的分析物清单，现在 包括碘化三卤甲烷（I-THMs）、燃料氧化物和挥发性有机物 易于从初步候选污染物中清除和捕集的化合物（VOC） 清单3（CCL3）。它使用马来酸，一种常见的食品防腐剂来保存样品， 消除了向现场运输危险试剂（盐酸）的要求。新的 该方法还允许选择离子监测（SIM）检测极低浓度的分析物 监管限制。对三台吹扫捕集器和几个捕集器进行了评估 大范围的吹扫量、吹扫速率和干燥吹扫时间，以确定可接受的吹扫极限 这些参数是为了在不影响性能的情况下允许方法的灵活性。 已在单个实验室完成验证研究，以验证修订后的方法 使用新防腐剂的精密度、准确度、检出限和储存稳定性。包括2个参考文献和表格。

Research is now complete on the U.S. Environmental Protection Agency's (USEPA's) effort to revise USEPA Method 524.2 for volatile organic contaminants in drinking water. The new method, Draft Method 524.3, achieves several significant goals. It has a revised list of analytes that now includes the iodinated trihalomethanes (I-THMs), fuel oxygenates, and volatile organic compounds (VOCs) amenable to purge-and-trap from the preliminary Contaminant Candidate List 3 (CCL3). It employs maleic acid, a common food preservative, to preserve samples, eliminating the requirement to ship a hazardous reagent (hydrochloric acid) to the field. The new method also allows selected ion monitoring (SIM) for the detection of analytes with very low regulatory limits. Three purge-and-trap concentrators and several traps were evaluated under a large range of purge volumes, purge rates, and dry purge times to determine acceptable limits for these parameters in order to allow method flexibility without jeopardizing performance. Validation studies in a single laboratory have been completed to validate the revised method for precision, accuracy, detection limit, and storage stability using the new preservation agents. Includes 2 references, tables.