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首页> 外文期刊>Marine Chemistry >Influence of pH, temperature, salinity, and dissolved organic matter on the photolysis of 2,4-dinitrotoluene and 2,6-dinitrotoluene in seawater
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Influence of pH, temperature, salinity, and dissolved organic matter on the photolysis of 2,4-dinitrotoluene and 2,6-dinitrotoluene in seawater

机译：pH，温度，盐度和溶解有机物对海水中2,4-二硝基甲苯和2,6-二硝基甲苯的光解的影响

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In this study, the influence of salinity, nitrate, pH, temperature, and dissolved organic matter on the rate of photolysis of 2,4-dinitrotoluene (2,4-DNT) and 2,6-dinitrotoluene (2,6-DNT) in marine, estuary, and laboratory-prepared waters was measured. Photochemical degradation was studied using a Suntest CPS+® solar simulator equipped with various filters designed to select specific regions of the solar spectrum. Degradation rates of the compounds were determined using HPLC analysis, and product formation was determined using LC/MS. DNT photolysis rates were influenced by the wavelength of the light irradiating the compound; 295, 305, and 320 ran long-pass filter exposures produced similar degradation rates while 385 and 395 nm filter exposures produced minimal or no degradation. Under the 295-nm filter, first-order DNT degradation rate constants increased with increasing salinity for both natural seawater and artificial seawater. The 2,6-DNT rate constants did change significantly when the pH (7.2 to 8.1), temperature (10 to 32 ℃), and nitrate (up to 4 mM) were varied over the range of values found in marine waters. Similar results were found for 2,4-DNT, except for temperature where the rate constant increased slightly with increasing temperature. The addition of dissolved organic matter (up to 10 mg/L) to ultrapure water, artificial seawater (salinity = 9), and natural seawater enhanced the photolysis of 2,6-DNT, while it only enhanced the photolysis of 2,4-DNT in the ultrapure and artificial seawater (salinity = 9). Products formed by 2,4-DNT photolysis in natural seawater were 2,4-dinitrobenzaldehyde, 2,4-dinitrobenzy Initrile, and 2-amino,4-nitrobenzoic acid. The photolysis of 2,6-DNT in natural seawater formed 2,6-dinitrobenzaldehyde, 2.6-dinitrobenzyl alcohol, and 2,6-dinitrobenzylnitrile.
机译：在这项研究中，盐度，硝酸盐，pH，温度和溶解的有机物对2,4-二硝基甲苯（2,4-DNT）和2,6-二硝基甲苯（2,6-DNT）的光解速率的影响在海洋，河口和实验室准备的水域中进行了测量。使用配备有各种滤光片的Suntest CPS +®太阳模拟器对光化学降解进行了研究，这些滤镜设计用于选择太阳光谱的特定区域。使用HPLC分析确定化合物的降解速率，并使用LC / MS确定产物的形成。 DNT的光解速率受照射化合物的光的波长影响。 295、305和320 nm长通滤光片曝光产生相似的降解率，而385和395 nm滤光片曝光产生最小或没有降解。在295 nm滤光片下，天然海水和人造海水的一阶DNT降解速率常数都随着盐度的增加而增加。当pH（7.2至8.1），温度（10至32℃）和硝酸盐（最高4 mM）在海水中发现的值范围内变化时，2,6-DNT速率常数确实发生了显着变化。对于2,4-DNT，发现了相似的结果，除了温度，速率常数随温度的升高而略有增加。向超纯水，人造海水（盐度= 9）和天然海水中添加溶解的有机物（最高10 mg / L）可增强2,6-DNT的光解，而仅增强2,4-DNT的光解。超纯和人造海水中的DNT（盐度= 9）。在天然海水中通过2,4-DNT光解形成的产物是2,4-二硝基苯甲醛，2,4-二硝基苯甲腈和2-氨基，4-硝基苯甲酸。 2,6-DNT在天然海水中的光解形成了2,6-二硝基苯甲醛，2.6-二硝基苄醇和2,6-二硝基苄腈。

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