Orange County Water District（OCWD）负责管理其流域的地下水供应以及特定的地表水位置。作为其管理计划的一部分，该地区支持积极的污染监测计划，以确定该饮用水源的影响和脆弱性。挥发性有机化合物（VOCs）是该区主要实验室检测到的最重要的目标化合物组之一。实验室使用EPA方法502.2和524.2监测挥发性有机化合物。这些方法要求使用1+1 HCl作为防腐剂，以防止生物降解和脱卤。本研究旨在确定是否有必要在EPA的14天保持期限内使用这种防腐剂，并确定防腐剂对目标化合物的影响。比较了三种水样:蒸馏水；地下水； 以及地表水。监测这三种基质中的加标样品的降解情况，并比较酸保存和非酸保存样品中目标化合物的回收率百分比。本文还包括一些关于运行酸化样品对分析系统影响的观察结果。

The Orange County Water District (OCWD) is responsible for the management of its basin's groundwater supply as well as for specific surface water locations. As part of its management plan, the District supports an aggressive pollution monitoring program to determine the impact on and vulnerability of this drinking water source. Volatile organic compounds (VOCs) have been among the most significant groups of target compounds detected by the District's main laboratory. The laboratory uses EPA methods 502.2 and 524.2 to monitor for VOCs. These methods require the use of 1+1 HCl as a preservative to prevent biodegradation and dehydrohalogenation. This study was conducted to determine if the use of this preservative is necessary within the EPA's 14 day holding time limit and to determine the impacts of the preservative on target compounds. Three types of water samples were compared: distilled water; groundwater; and surface water. Spiked samples in these three matrices were monitored for degradation and the percent recoveries of target compounds were compared between acid-preserved and non acid-preserved samples. The paper also includes some observations on the impacts of running acidified samples on an analytical system.