Yost Sally L, Pennington Judith C, Brannon James M, Hayes Charolett A
SpecPro, Inc., 4815 Bradford Drive, Suite 201, Huntsville, AL 35805, USA.
Mar Pollut Bull. 2007 Aug;54(8):1262-6. doi: 10.1016/j.marpolbul.2007.03.019. Epub 2007 May 21.
Process descriptors were determined for picric acid, TNT, and the TNT-related compounds 2,4DNT, 2,6DNT, 2ADNT, 4ADNT, 2,4DANT, 2,6DANT, TNB and DNB in marine sediment slurries. Three marine sediments of various physical characteristics (particle size ranging from 15 to >90% fines and total organic carbon ranging from <0.10 to 3.60%) were kept in suspension with 20ppt saline water. Concentrations of TNT and its related compounds decreased immediately upon contact with the marine sediment slurries, with aqueous concentrations slowly declining throughout the remaining test period. Sediment-water partition coefficients could not be determined for these compounds since solution phase concentrations were unstable. Kinetic rates and half-lives were influenced by the sediment properties, with the finer grained, higher organic carbon sediment being the most reactive. Aqueous concentrations of picric acid were very stable, demonstrating little partitioning to the sediments. Degradation to picramic acid was minimal, exhibiting concentrations at or just above the detection limit.
测定了苦味酸、三硝基甲苯（TNT）以及与TNT相关的化合物2,4-二硝基甲苯（2,4DNT）、2,6-二硝基甲苯（2,6DNT）、2-氨基二硝基甲苯（2ADNT）、4-氨基二硝基甲苯（4ADNT）、2,4-二氨基二硝基甲苯（2,4DANT）、2,6-二氨基二硝基甲苯（2,6DANT）、三硝基苯（TNB）和二硝基苯（DNB）在海洋沉积物浆液中的过程描述符。三种具有不同物理特性（粒径范围为15%至>90%细颗粒，总有机碳范围为<0.10%至3.60%）的海洋沉积物与20ppt的盐水保持悬浮状态。TNT及其相关化合物的浓度在与海洋沉积物浆液接触后立即下降，在整个剩余测试期间，水相浓度缓慢下降。由于溶液相浓度不稳定，无法确定这些化合物的沉积物-水分配系数。动力学速率和半衰期受沉积物性质影响，粒度更细、有机碳含量更高的沉积物反应性最强。苦味酸的水相浓度非常稳定，表明其在沉积物中的分配很少。降解为苦氨酸的程度最小，其浓度处于或略高于检测限。
