Department of Biology, Food Science Cluster, Western Kentucky University, 1906 College Heights Blvd, Bowling Green, KY 42101, USA; Division of Animal and Nutritional Sciences, West Virginia University, PO Box 6108, Morgantown, WV 20146, USA.
Department of Chemistry, Advanced Materials Institute, Western Kentucky University, 2413 Nashville Road, Bowling Green, KY 42101, USA.
Food Chem. 2016 Jan 1;190:97-102. doi: 10.1016/j.foodchem.2015.04.146. Epub 2015 May 14.
Free chlorine (FC) reacting with organic matter in wash water promotes the formation of chlorine by-products. This study aims to evaluate the dynamic impact of FC and organic load on the generation of haloacetic acids (HAAs) and trihalomethanes (THMs) in simulated wash water. Lettuce juice was sequentially added into FC solution with FC periodically replenished. Water samples were collected after each lettuce juice addition to measure water qualities and determine HAAs and THMs using US-Environmental-Protection-Agency (EPA) methods. Concentrations of 88-2103 μg/l of total HAAs and 20.79-859.47 μg/l of total THMs were detected during the study. Monobromoacetic, tribromoacetic, chlorodibromoacetic and trichloroacetic acid were the major HAAs components. Chloroform (trichloromethane) was the primary THMs present. A significant correlation of HAAs with chemical oxygen demand and THMs with FC was observed. Results indicated that optimizing wash water sanitizing systems to limit organic matters and maintain minimal effective FC concentration is critical.
游离氯（FC）与洗涤水中的有机物反应会促进氯副产物的形成。本研究旨在评估 FC 和有机负荷对模拟洗涤水中卤乙酸（HAAs）和三卤甲烷（THMs）生成的动态影响。将 FC 溶液中周期性补充 FC，然后将生菜汁依次加入其中。每次加入生菜汁后收集水样，测量水质，并采用美国环保署（EPA）方法测定 HAAs 和 THMs。在研究过程中，检测到总 HAAs 的浓度为 88-2103μg/l，总 THMs 的浓度为 20.79-859.47μg/l。一溴乙酸、三溴乙酸、二溴氯乙酸和三氯乙酸是主要的 HAAs 成分。氯仿（三氯甲烷）是主要的 THMs。HAAs 与化学需氧量呈显著相关，THMs 与 FC 呈显著相关。结果表明，优化洗涤水消毒系统以限制有机物并保持最小有效 FC 浓度至关重要。
