Effect of Surfactant on the Volatilization of Organochlorine Pesticides from Still Artificial Seawater

摘要

[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2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.[ABstract]:The effect of sodium dodecylbenzene sulfonate ( SDBS) on the volatilization of 17 organochlorine pesticides ( OCPs) from stillartificial seawater has been examined. The results show that SDBS at low concentration can retard the volatilization of OCPs compared to/ clean0 surface. The retarding influence ismore pronounced for high level of SDBS than it is for low level of SDBS. A good positive correlationbetween the gas2seawater partition coefficients and the measured volatilization rates of OCPs is observed. Although the SDBS films present nosignificant, direct resistance to transfer, the films can absorb more OCPs from the above atmosphere with respect to the / clean0 surface andreduce the net volatilization flux from the still artificial seawater. The effect of the film is more pronounced for volatilization of more volatileOCPs than it is for less volatile OCPs.