Impacts of particulate organic carbon and dissolved organic carbon on removal of polycyclic aromatic hydrocarbons, organochlorine pesticides, and nonylphenols in a wetland

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Impacts of particulate organic carbon and dissolved organic carbon on removal of polycyclic aromatic hydrocarbons, organochlorine pesticides, and nonylphenols in a wetland
	Luo, Jianping; Ma, Mei; Liu, Cao; Zha, Jinmiao; Wang, Zijian
刊名	JOURNAL OF SOILS AND SEDIMENTS
	2009-06
卷号	9 期号:3 页码:180-187
关键词	Dissolved organic carbon Fate Organic contaminants Particulate organic carbon Wetland
中文摘要	The potential of wetlands for controlling point- and nonpoint-source pollution in surface water has attracted increasing interest. The partitioning process of organic contaminants between water, particulate organic carbon (POC) and dissolved organic carbon (DOC), impacts their behaviors in the aquatic environments. Meantime, the partitioning process of organic contaminants is closely related to their physicochemical properties, such as hydrophobicity (or K (ow)), and their fates in wetlands may vary greatly depending on physicochemical properties. The aim of this study was to examine fates and removals of polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs) and nonylphenols (NPs) in a wetland in Beijing, China, and provide useful information for ecological remediation. Water samples, collected at five sites from inlet to outlet of the wetland once a month in summer 2006, were immediately filtered within 2 days through 0.45-mu m glass fiber prefilters and enriched by solid-phase extraction. The filtered particulates were collected as the total suspended particulates (TSPs), freeze-dried, and Soxhlet-extracted. After extraction, samples were purified following a clean-up procedure and analyzed by GC-MS. TSPs could be removed efficiently with a removal rate of 97.4%, and DOC could be moderately removed with a removal rate of 44.7% from inlet to outlet. The total removals of target contaminants varied widely from null to 82.0%. A good correlation between logK (ow) and logK (oc) (organic-carbon-normalized suspended-particulate partition coefficient) was observed (r (2) = 0.84 for PAHs and r (2) = 0.86 for OCPs, p < 0.01). Ratios of the POC-bound fraction of target contaminants (or DOC-bound fraction) to the freely dissolved fraction increased with their K (ow) values. The removal of the POC fraction contributed more than 50% to the total removal for the contaminants with logK (ow) > 5.0. Only a small portion of the removal was attributed to the removal of the freely dissolved fraction. Hydrophobic compounds such as PAHs and OCPs with higher K (ow) values would show stronger POC or DOC preference. Their removal depended greatly on their K (ow) values and the removal of total suspended particulates. On the other hand, concentrations of NPs decreased little in the wetland, probably due to their production through degradation of their precursors and relatively low hydrophobicity. POC and DOC play essential roles on the fates and removals of hydrophobic organic contaminants in the wetland. The removal of target contaminants with a high K (ow) should be mainly through association with the suspended particulates which were precipitated and retained in the wetland. The fates of the organic contaminants in the wetland greatly depended on their hydrophobicities. Further work should be done to study the influence of hydraulic retention time and some other environmental factors, e.g., temperature, on removals and fates of organic contaminants. Behavior of NPs and their precursors in the wetland should also be investigated more thoroughly.
WOS记录号	WOS:000267215900004
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/21690]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Luo, Jianping,Ma, Mei,Liu, Cao,et al. Impacts of particulate organic carbon and dissolved organic carbon on removal of polycyclic aromatic hydrocarbons, organochlorine pesticides, and nonylphenols in a wetland[J]. JOURNAL OF SOILS AND SEDIMENTS,2009,9(3):180-187.
APA	Luo, Jianping,Ma, Mei,Liu, Cao,Zha, Jinmiao,&Wang, Zijian.(2009).Impacts of particulate organic carbon and dissolved organic carbon on removal of polycyclic aromatic hydrocarbons, organochlorine pesticides, and nonylphenols in a wetland.JOURNAL OF SOILS AND SEDIMENTS,9(3),180-187.
MLA	Luo, Jianping,et al."Impacts of particulate organic carbon and dissolved organic carbon on removal of polycyclic aromatic hydrocarbons, organochlorine pesticides, and nonylphenols in a wetland".JOURNAL OF SOILS AND SEDIMENTS 9.3(2009):180-187.