Influence of natural dissolved organic matter, temperature, and mixing on the abiotic hydrolysis of triazine and organophosphate pesticides
Influence of natural dissolved organic matter, temperature, and mixing on the abiotic hydrolysis of triazine and organophosphate pesticides
复制标题
DOI：
10.1021/jf960315r
复制
发表时间：
1996-11-01
影响因子：
6.1
通讯作者：
Suffet, IH
中科院分区：
文献类型：
--
作者：
Noblet, JA;Smith, LA;Suffet, IH
研究了西玛津、莠去津、二嗪农、甲基异稻瘟灵和毒死蜱在三种不同的天然沃茨和缓冲Milli-Q水中的非生物水解。在pH 8.0和40 ℃下，在43天内，三嗪在任何沃茨中均未显示出可检测的浓度降低。二嗪磷和甲基二嗪磷的水解速率在所有测试的沃茨中在统计学上相似。在高浓度溶解性有机物（DOM）（34.5 mg/L溶解性有机碳）存在下，毒死蜱的水解速率降低了32%。活化能较大，因此预测的水解速率明显慢于先前报道的。研究了连续剧烈混合对水解速率的影响，发现其影响很小。结果表明，非催化的非生物水解是非常缓慢的温度和pH值的典型的大多数天然沃茨，这些化合物，并确认有必要更好地了解DOM的相对影响，催化和生物降解的有机磷和三嗪农药的命运。
Abiotic hydrolysis of simazine, atrazine, diazinon, methylparathion, and chlorpyrifos was studied in three different natural waters and buffered Milli-Q water. The triazines showed no detectable decrease in concentration in any of the waters over 43 days at pH 8.0 and 40 degrees C. The rates of hydrolysis for diazinon and methylparathion were statistically similar in all waters tested. Chlorpyrifos exhibited a similar to 32% decrease in hydrolysis rate in the presence of a high concentration of dissolved organic matter (DOM) (34.5 mg/L dissolved organic carbon). The activation energies are larger, and thus the predicted hydrolysis rates are significantly slower than those previously reported. The effect of continuous vigorous mixing on hydrolysis rates was investigated and found to have only a minor effect. The results suggest that uncatalyzed abiotic hydrolysis is very slow for these compounds at the temperatures and pH's typical of most natural waters and affirm the need for a greater understanding of the relative influence of DOM, catalysis, and biodegradation on the fate of organophosphate and triazine pesticides.