Adsorption catalyzed chemical hydrolysis of atrazine
Adsorption catalyzed chemical hydrolysis of atrazine
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DOI：
10.1021/es60021a006
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发表时间：
1968-09
影响因子：
11.4
通讯作者：
D. Armstrong;G. Chesters
中科院分区：
文献类型：
--
作者：
D. Armstrong;G. Chesters
研究了阿特拉津在土壤和模拟吸附剂上的吸附及其对阿特拉津水解的影响。研究的吸附剂只有土壤和羧酸树脂影响阿特拉津水解的速率。酚醛树脂，醋酸纤维素，和蒙脱石粘土表现出较高的阿特拉津吸附容量，但不影响阿特拉津水解率。对于土壤和羧基树脂，阿特拉津水解的一级速率常数与阿特拉津的吸附程度（%）直接相关;对于相同的吸附程度，羧基树脂的水解速率高于土壤。吸附催化水解反应是吸附态羧基与莠去津环氮原子间氢键作用的结果。这一结论得到了以下因素的支持：羧基树脂催化水解的能力、阿特拉津吸附随着树脂羧基离子化或阿特拉津环氮原子质子化的增加而减少，以及水解速率与吸附程度之间的直接关系。羧基树脂和土壤。1-之前的研究表明，阿特拉津在土壤系统中会水解为羟基阿特拉津（Arm-strong、Chesters、例如，1967; Harris，1967）通过在土壤胶体表面吸附明显催化的非生物反应（Armstrong，Chesters等，1967年）。最近的证据支持吸附催化阿特拉津在土壤中水解的可能性，即蒙脱石，一种常见的土壤矿物，促进阿特拉津水解（Russell，Cruz等人，1968年）。除三嗪类农药外，几种类型的农药在土壤颗粒存在下也易发生化学降解（Konrad，1967年; Konrad，Armstrong等人，1967年）。鉴于羟基阿特拉津的非植物毒性和阿特拉津对除草剂的抗性，将阿特拉津化学水解为羟基阿特拉津在土壤中具有相当重要的意义。
The adsorption of atrazine on soil and model adsorbents as it affects atrazinehydrolysis was determined. Of the adsorbents investigated only the soil and a carboxylic resin affected the rate of atrazine hydrolysis. A phenolic resin, cellulose acetate, andmontmorillonite clay exhibited high atrazine adsorption capacities but did not affect the rate of atrazine hydrolysis. For the soil and the carboxyl resin, the first-order rate constant for atrazine hydrolysis was related directly to the extent (%) of atrazine adsorption; for the same extent of adsorptionthe hydrolysis rate was higher in the presence of the carboxyl resin than soil. Adsorption catalyzed hydrolysis apparently resulted from hydrogen bonding between the adsorbentcarboxyl and atrazine ring nitrogen atom. This conclusion was supported by the ability of the carboxyl resin to catalyze hydrolysis, the decrease in atra-zine adsorption with increased resin carboxyl group ionization or atrazine ring nitrogen atom protonation, and the direct relationship between hydrolysis rate and the extent of ad-sorption on the carboxyl resin and soil.1—Previous investigations have shown that atrazine is hydrolyzed to hydroxyatrazine in soil systems (Arm-strong, Chesters, et al., 1967; Harris, 1967) by a nonbiological reaction catalyzed apparently by adsorption at soil colloidal surfaces (Armstrong, Chesters, et al., 1967). The possibility that adsorption catalyzes atrazinehydrolysis in soil is sup-ported by recent evidence that montmorillonite, a common soil mineral, promotes atrazine hydrolysis (Russell, Cruz, et al., 1968). Several types of pesticides, other than triazines, are also susceptibleto chemical degradation in the presence of soil particles (Konrad, 1967; Konrad, Armstrong, et al., 1967). Chemical hydrolysis of atrazine to hydroxyatrazine is of considerable importance in soils in view of the nonphyto-toxicity of hydroxyatrazine and the resistance of atrazine to