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首页> 外文期刊>Journal of environmental science and health >Electrospray Ionization Mass Spectrometry (ESI-MS) monitoring of the photolysis of diazinon in aqueous solution: Degradation route and toxicity of by-products against Artemia salina
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Electrospray Ionization Mass Spectrometry (ESI-MS) monitoring of the photolysis of diazinon in aqueous solution: Degradation route and toxicity of by-products against Artemia salina

机译：电喷雾电离质谱（ESI-MS）监测水溶液中二嗪农的光解：副产物对卤虫的降解途径和毒性

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摘要

The photolytic degradation of diazinon, an organophosphorus pesticide, in aqueous medium under assorted pH values was continuously monitored by direct infusion electrospray ionization mass spectrometry (ESI-MS). The results indicated that the UV radiation was quite efficient in promoting the pesticide degradation at the three pH levels evaluated (5,7 and 8). The m/z of the most abundant ions observed in the mass spectra (MS), in conjunction with the fragmentation patterns of such ionic species (MS/MS data), made possible the proposition of chemical structures for the main by-products formed. As a result, routes for the photodegradation of diazinon in aqueous solution could thus be suggested. In the assays using Anemia salina (brine shrimp) it was verified that the photodegradation products exhibited much lower toxicity than the primary substrate. Aiming at mimicking the conditions ordinarily found in water treatment plants, an additional series of tests was conducted with a solution containing sodium hypochlorite and diazinon. This solution, when not exposed to UV radiation, exhibited high toxicity against the microorganisms. Under the influence of UV radiation, however, the toxicity rates decreased dramatically. This result is relevant because it points toward the confident application of UV radiation to neutralize the deleterious effects caused by diazinon (and perhaps other organophosphorus pesticides) as well as sodium hypochlorite to the environment.
机译：通过直接注入电喷雾电离质谱法（ESI-MS）连续监测在各种pH值下水性介质中二嗪农酮（一种有机磷农药）的光解降解。结果表明，在所评估的三个pH值（5,7和8）下，UV辐射在促进农药降解方面非常有效。在质谱（MS）中观察到的最丰富离子的m / z，与此类离子物质的碎片图谱（MS / MS数据）相结合，可以为所形成的主要副产物提出化学结构的建议。结果，因此可以提出水溶液中二嗪农的光降解途径。在使用贫血盐沼（盐水虾）的测定中，已证实光降解产物的毒性远低于主要底物。为了模拟水处理厂中通常存在的条件，还使用含有次氯酸钠和二嗪农的溶液进行了一系列其他测试。当该溶液不暴露于紫外线辐射时，对微生物表现出高毒性。然而，在紫外线辐射的影响下，毒性率急剧下降。该结果是有意义的，因为它指向可靠地应用紫外线辐射，以抵消由二嗪农（以及其他有机磷农药）以及次氯酸钠对环境造成的有害影响。

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