Papiernik SK, Spalding RF
University of Nebraska Water Sciences Laboratory, Lincoln, Nebraska 68583-0844.
J Agric Food Chem. 1998 Feb 16;46(2):749-754. doi: 10.1021/jf9706235.
The degradation of atrazine [2-chloro-4-(ethylamino)-6-isopropylamino-1,3,5-triazine], deethylatrazine [DEA; 2-amino-4-chloro-6-(isopropylamino)-1,3,5-triazine], and deisopropylatrazine [DIA; 2-amino-4-chloro-6-(ethylamino)-1,3,5-triazine] was assessed under limited oxygen conditions using in situ microcosms. Denitrification was induced in a shallow sand and gravel aquifer to measure the potential for degradation of atrazine, DEA, and DIA under low-O(2) conditions. The dissolved oxygen content decreased from 7-8 mg/L to </=1 mg/L within 4 days and remained less, similar3 mg/L for the remainder of the 45-day experiment. Atrazine, DEA, and DIA concentrations (normalized to the bromide concentration at each sampling time to account for dilution) did not show a significant decrease with time, indicating that these compounds are relatively stable under the low-O(2) conditions induced in the aquifer. Although removal of one alkyl group has been proposed as the rate-limiting step in atrazine degradation, no transformation of either monodealkylated metabolite (DEA or DIA) was observed in this study.
使用原位微观模型，在有限氧气条件下评估了莠去津[2-氯-4-(乙氨基)-6-(异丙氨基)-1,3,5-三嗪]、去乙基莠去津[DEA；2-氨基-4-氯-6-(异丙氨基)-1,3,5-三嗪]和去异丙基莠去津[DIA；2-氨基-4-氯-6-(乙氨基)-1,3,5-三嗪]的降解情况。在浅层砂卵石含水层中诱导反硝化作用，以测量低氧条件下莠去津、DEA和DIA的降解潜力。在4天内，溶解氧含量从7 - 8毫克/升降至≤1毫克/升，并在45天实验的剩余时间内保持在3毫克/升以下。莠去津、DEA和DIA的浓度（在每个采样时间根据溴化物浓度进行归一化以考虑稀释）并未随时间显著降低，表明这些化合物在含水层中诱导的低氧条件下相对稳定。尽管已提出去除一个烷基是莠去津降解的限速步骤，但在本研究中未观察到任何单脱烷基代谢物（DEA或DIA）的转化。
