Reinert K H, Rodgers J H, Hinman M L, Leslie T J
Ecotoxicol Environ Saf. 1985 Aug;10(1):86-96. doi: 10.1016/0147-6513(85)90010-7.
The compartmentalization and persistence of endothall, an aquatic herbicide, was studied using static greenhouse experimental pools. An overall aqueous pseudo-first-order decay rate coefficient of 0.173 day-1 and a half-life of 4.01 days were observed at endothall treatment levels of 0.03, 1.6, and 4.5 mg liter-1. Instantaneous sediment partition coefficients (Kp) were calculated at maximum endothall concentrations in sediments and ranged from 51.4 to 127.7. Bioconcentration factors (BCF) for the submerged aquatic macrophyte, Myriophyllum spicatum, ranged from 3.9 to 768.9. These instantaneous BCF values were calculated at the maximum M. spicatum endothall concentrations. The short aqueous half-life for endothall compares well with previous studies; however, both the Kp and BCF were one to three orders of magnitude higher than observed in a previous laboratory study and calculated from regression equations based on endothall solubility. Experimental pool studies can be important steps in translation of data from the laboratory to field and in the development of field sampling protocols that require understanding of expected behavior of a chemical in aquatic systems.
利用静态温室实验池研究了水生除草剂烯草酮的分区化和持久性。在烯草酮处理水平为0.03、1.6和4.5毫克/升时，观察到总的水体假一级衰减速率系数为0.173天⁻¹，半衰期为4.01天。根据沉积物中烯草酮的最大浓度计算出瞬时沉积物分配系数（Kp），范围为51.4至127.7。沉水大型水生植物狐尾藻的生物富集系数（BCF）范围为3.9至768.9。这些瞬时BCF值是在狐尾藻中烯草酮的最大浓度下计算得出的。烯草酮较短的水体半衰期与先前的研究结果相当；然而，Kp和BCF均比先前一项实验室研究中观察到的以及根据基于烯草酮溶解度的回归方程计算出的值高1至3个数量级。实验池研究可能是将数据从实验室转化到实地以及制定需要了解化学品在水生系统中预期行为的实地采样方案过程中的重要步骤。
