Kontchou C Y, Gschwind N
MIRECO, Environmental Biotechnology, Malzgasse 9, Basel, CH-4052, Switzerland.
Ecotoxicol Environ Saf. 1999 May;43(1):47-56. doi: 10.1006/eesa.1998.1756.
The potential for biodegradation of s-triazine pesticides was investigated in laboratory batch and sequence batch experiments using a stable mixed bacterial community enriched on atrazine. The experiments were performed aerobically in a mineral salt solution complemented with a mixture of s-triazines as sole carbon and energy sources. Comparisons were made between the efficiency of the inoculum for atrazine degradation in mineral salt solution and in wastewater. In batch cultivation, atrazine, simazine, hydroxyatrazine, and terbutylazine were degraded to concentrations below 0.1 mg/liter after 6 days; evidence of the mineralization was the detection of 14CO2 from [U-ring-14C] atrazine and the production of nitrate and chloride ions. The low degradation rate observed for cyanuric acid and desethylatrazine suggests that degradation proceeded via N-dealkylation and dechlorination. Nevertheless, degradation of ametryne and cyromazine presume the involvement of other degradation pathways. Evidence was given that presence of other additional carbon sources is not an obstacle to atrazine biodegradation, since better results were obtained using wastewater.
使用在莠去津上富集的稳定混合细菌群落，通过实验室批次实验和序批式实验研究了均三嗪类农药的生物降解潜力。实验在以均三嗪混合物作为唯一碳源和能源补充的矿物盐溶液中好氧进行。对接种物在矿物盐溶液和废水中降解莠去津的效率进行了比较。在批次培养中，6天后莠去津、西玛津、羟基莠去津和特丁津降解至浓度低于0.1毫克/升；矿化的证据是从[U-环-14C]莠去津中检测到14CO2以及硝酸盐和氯离子的产生。对氰尿酸和去乙基莠去津观察到的低降解率表明降解是通过N-脱烷基化和脱氯进行的。然而，莠灭净和环丙氨嗪的降解推测涉及其他降解途径。有证据表明，其他额外碳源的存在并非莠去津生物降解的障碍，因为使用废水可获得更好的结果。
