光降解对DOM与Cu^(2+)、Pb^(2+)结合能力的影响  

PHOTOCHEMICAL DEGRADATION OF DISSOLVED ORGANIC MATTER AND ITS EFFECT ON BINDING OF Cu^(2+) AND Pb^(2+)

作　　者：范晓明[1,2,3] 李先国[1] 邹惠玲[2] 陈洪金[2] 

机构地区：[1]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266100 [2]山东省产品质量监督检验研究院食品化工中心,山东济南250100 [3]山东省材料化学安全检测技术重点实验室,山东济南250100

出　　处：《海洋湖沼通报》2013年第2期89-92,共4页Transactions of Oceanology and Limnology

摘　　要：以氙灯为光源,通过平衡渗析法研究了美国萨旺尼河DOM在光解过程中,DOM与重金属离子(Cu2+、Pb2+)结合系数的变化。研究表明,DOM光照过程中,氧气对DOM起到促进作用。氧气充足条件下,将使DOM更大程度上发生光解。经过72小时照射,空气饱和和空气平衡状态下,DOM与Cu2+结合系数分别由1.33下降到0.70和0.62,DOM与Pb2+结合系数分别由0.14下降到0.09和0.05。光降解使更多的金属离子由与DOM的结合态转变为自由态。In this study, it is investigated the photochemical transformation of Suwannee river DOM ir- radiated by xenon lamp in aqueous solution, and the combining ability changes between DOM and heavy metal ions （Cu2＋, Pb2＋） through the photodissociation process by equilibrium dialysis. The re- sults indicated that Oxygen play a very important role in the DOM photolysis, oxygen-rich conditions, will allow DOM to a greater extent photolysis. After 72 hours irradiation, binding coefficient between DOM and Cu2＋ （Kcuc） decrease from 1.33 to 0.70 in the condition of air saturation while Kcucdecrease from 1.33 to 0.62 in the condition of air balance; binding coefficient between DOM and Pb2＋ （Kpbc） decrease from 0.14 to 0.09 in the condition of air saturation while Kpbcdecrease from 0.14 to 0.05 in the condition of air balance, resulting in a transfer of combined states of heavy metal ions to free states.

关 键 词：溶解有机物 光降解 重金属离子 结合系数 

分 类 号：X132[环境科学与工程—环境科学]