黑臭河流沉积物磷、铁、硫的DGT同步分析研究  

A study of synchronous measurement of phosphorous,iron and sulfur in the sediment of malodorous black rivers by diffusive gradients in thin films(DGT)

作　　者：荣楠 朱家亮 周道坤 陈中颖[1,2,3] 刘晓伟 卢文洲[1,2,3] RONG Nan;ZHU Jialiang;ZHOU Daokun;CHEN Zhongying;LIU Xiaowei;LU Wenzhou(South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510530;State Key Laboratory of Water Environmental Simulation and Pollution Control, Guangzhou 510530;Key Laboratory of Water and Atmosphere of Guangdong Province, Guangzhou 510530)

机构地区：[1]环境保护部华南环境科学研究所,广州510530 [2]国家水环境模拟与污染控制重点实验室,广州510530 [3]广东省水与大气重点实验室,广州510530

出　　处：《环境科学学报》2018年第7期2599-2606,共8页Acta Scientiae Circumstantiae

基　　金：中央级公益性科研院所基本科研业务专项(No.PM-zx703-201701-038;PM-zx703-201701-054);国家自然科学基金(No.21707040);广州市科技计划项目(No.201504010005)~~

摘　　要：沉积物中磷(P)、铁(Fe)、硫(S)之间存在密切的耦合关系,但大部分研究并未提供直接的原位证据,需要借助高分辨的获取技术才能表征.为了探索三者之间的耦合关系,本文利用Zr O-Ag I DGT和Chelex DGT对东莞市黑臭河流沉积物中有效态P、Fe、S进行了高分辨分析.结果表明:应用DGT技术能够获得黑臭河流沉积物中有效态P、Fe、S的高分辨率浓度分布,并且实验结果可靠,有效地避免了主动采样方法和沉积物空间异质性对P、Fe、S同步分析的影响.各采样点沉积物中有效态P、S在垂向上的空间分布趋势基本相似,部分采样点出现有效态P、Fe、S同步变化的现象,同步获得的微界面浓度分布较好地反映了三者的耦合关系.对P、Fe、S在水-沉积物界面附近的含量分布进行相关性分析,结果表明三者之间具有显著正相关(p<0.05),进一步证实了黑臭河流沉积物中也存在P、Fe、S同步释放的现象.大部分样点沉积物-水界面有效态P、Fe、S的扩散通量为正值,表现为由沉积物向上覆水释放P、Fe、S.沉积物中P、Fe、S的耦合释放表明其对黑臭的形成和内源磷释放至关重要.There is close coupling relations among phosphorous（ P）,iron（ Fe） and sulfur（ S） in sediments,but most research did not provide direct in situ evidence. The coupling relations need to be expressed by high resolution acquisition technology. In order to investigate the coupling relations,the high resolution distribution of available P,Fe and S in malodorous black river sediments in Dongguan City was measured using Zr O-Ag I diffusive gradients in thin films（ Zr O-Ag I DGT） and Chelex diffusive gradients in thin films（ Chelex DGT）. The results show that the high resolution distribution of available P,Fe and S in malodorous black river sediments could be obtained by DGT,and the results were reliable. DGT could effectively avoid the adverse effects of active sampling and spatial heterogeneity on synchronous analysis of P,Fe and S. P and S had a similar distribution trend in vertical direction at all sampling sites. Changes of P,Fe and S were consistent along the profiles at some sampling points. The synchronously obtained micro-interface concentration distribution reflected their coupling relations well. The significant positive correlations（ p〈0.05） among P,Fe and S confirmed that they could also be released synchronously in malodorous black river sediments. The positive diffusion fluxes of available P,Fe and S at the sediment-waterinterface indicated that the sediments would release these matters to the overlying water. The coupling and releasing of P,Fe and S in sediments is therefore of crucial importance to malodorous black water forming and internal phosphorus release.

关 键 词：黑臭河流 沉积物 磷铁硫 DGT 同步 

分 类 号：X522[环境科学与工程—环境工程]