研究报告
孙冰清,高彦征,孙瑞.几种低分子量有机酸和氨基酸对黄棕壤吸附菲的影响[J].环境科学学报,2011,31(1):158-163
几种低分子量有机酸和氨基酸对黄棕壤吸附菲的影响
- Effect of low-molecular-weight organic acids and amino acids on the sorption of phenanthrene in Typic Paleudalfs
- 基金项目：国家自然科学基金(No.20777036,40701073,40971137);江苏省自然科学基金(No.BK2009315);霍英东教育基金(No.122045)
- 作者
- 单位
- 孙冰清
- 南京农业大学资源与环境科学学院, 土壤有机污染控制与修复研究所, 南京 210095
- 高彦征
- 南京农业大学资源与环境科学学院, 土壤有机污染控制与修复研究所, 南京 210095
- 孙瑞
- 南京农业大学资源与环境科学学院, 土壤有机污染控制与修复研究所, 南京 210095
- 摘要：采用批量平衡试验方法,研究了根系分泌物中几种常见的低分子量有机酸(LMWOA)和氨基酸对黄棕壤吸附菲的影响.结果表明,在供试有机酸和氨基酸的影响下黄棕壤对菲的等温吸附曲线仍呈显著的线性关系,分配作用是黄棕壤吸附菲的主导机制,供试LMWOA和氨基酸对黄棕壤吸附菲有抑制作用,且加入量越大,抑制作用越强.与氨基酸相比,LMWOA对土壤吸附菲的抑制作用更强,具体抑制作用大小顺序为:草酸>柠檬酸>苹果酸>>丙氨酸>丝氨酸.试验同时分析了黄棕壤吸附菲平衡溶液中水溶性有机质(DOM)的浓度,发现加入LMWOA或氨基酸后土壤固相有机质含量略有降低(<0.66%),而DOM浓度增大,DOM与菲的结合作用对土壤吸附菲的抑制作用增强,这是供试根系分泌物抑制土壤吸附菲的主要原因.
- Abstract：The sorption of phenanthrene by Typic Paleudalfs was investigated in batch experiments designed to explore the effect of typical root exudates by addition of low-molecular-weight organic acids (LMWOA) and amino acids. Phenanthrene sorption isotherms by Typic Paleudalfs could be well described by a linear sorption model irrespective of the addition of organic and amino acids. The addition of organic and amino acids significantly inhibited the sorption of phenanthrene by the soil,and adding larger amounts of these model root exudates to the soil resulted in stronger inhibition of phenanthrene sorption. Compared with amino acids,LMWOAs displayed stronger inhibition of phenanthrene sorption in soil. The inhibitory ability of five tested organic and amino acids for phenanthrene sorption was in the order of oxalic acid>citric acid>malic acid >> alanine>serine. The concentrations of dissolved organic matter (DOM) in equilibrium solution of phenanthrene sorption were detected,and were observed to be higher with the addition of organic and amino acids,while the soil organic carbon (foc) content was observed to be a little lower with the addition of simulated root exudate. The partition of phenanthrene into DOMin solution is proposed to be the main cause for the decrease of phenanthrene sorption in soil with the addition of test root exudates.
- Key words：root exudates polycyclic aromatic hydrocarbons (PAHs) low-molecular-weight organic acid (LMWOA) amino acid soil sorption
摘要点击次数： 3031 全文下载次数： 3274
