| 十二烷基苯磺酸钠对有机氯农药在模拟的静海水水面挥发的影响 |
| 摘要点击 1427 全文点击 1011 投稿时间：2008-09-14 修订日期：2008-11-14 |
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| 中文关键词 表面活性剂 有机氯农药 静水面 挥发速率 |
| 英文关键词 surfactant organochlorine pesticides (OCPs) still water volatilization rate |
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| 中文摘要 |
| 研究了阴离子表面活性剂十二烷基苯磺酸钠（SDBS）对17种有机氯农药（OCPs）在模拟静海水水面挥发的影响及机制.结果表明，低浓度SDBS的存在能抑制OCPs的挥发，抑制能力有随SDBS浓度增加而增加的趋势,且经盐常数校正后的气-水分配系数与挥发速率常数在对数散点图上存在很好的正相关关系. OCPs化合物挥发阻力分析表明，低浓度SDBS形成的表面膜不会对OCPs的挥发阻力产生直接影响，但却增加了大气中OCPs化合物在液面的沉降，造成净挥发量减少，且挥发性相对较强的化合物受表面活性膜的影响更大. |
| 英文摘要 |
| The effect of sodium dodecylbenzene sulfonate (SDBS) on the volatilization of 17 organochlorine pesticides (OCPs) from still artificial seawater has been examined. The results show that SDBS at low concentration can retard the volatilization of OCPs compared to “clean” surface. The retarding influence is more pronounced for high level of SDBS than it is for low level of SDBS. A good positive correlation between the gas-seawater partition coefficients and the measured volatilization rates of OCPs is observed. Although the SDBS films present no significant, direct resistance to transfer, the films can absorb more OCPs from the above atmosphere with respect to the “clean" surface and reduce the net volatilization flux from the still artificial seawater. The effect of the film is more pronounced for volatilization of more volatile OCPs than it is for less volatile OCPs. |
