title: Assessing the relationship and influence of black carbon on distribution status of organochlorines in the coastal sediments from Pakistan.
abstract: Levels of total organic carbon (TOC) and black carbon (BC) were determined together with those of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in the selected eighteen coastal sites (n = 285) along the Arabian Sea from Pakistan. Results showed that the total concentration of TOC, BC, ∑OCPs and ∑26PCBs ranged between 0.3 and 2.9% dw, 0.1-0.2% dw, 0.9-110 ng g(-1) dw and 6.2-1200 ng g(-1) dw, respectively. Correlation analysis of BC (r = 0.26-0.89) and TOC (r = 0.06-0.69) revealed a stronger association with studied compounds. The sedimentary depositional fluxes (D) for ∑OCPs and ∑26PCBs were calculated as 1.7 and 4.9 tons yr(-1), respectively. In the coastal belt of Pakistan, sedimentary mass inventories (I) indicated the presence of 13 and 37 metric tons of ∑OCPs and ∑26PCBs, respectively.
authors.affiliation: Environmental Biology and Ecotoxicology Laboratory, Department of Environmental Sciences, Quaid-I-Azam University, Islamabad 45320, Pakistan.
authors.forename: Usman
authors.initials: U
authors.lastname: Ali
authors.affiliation: Environmental Biology Laboratory, Department of Plant Sciences, Quaid-I-Azam University, Islamabad 45320, Pakistan; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Jabir Hussain
authors.initials: JH
authors.lastname: Syed
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Liu
authors.initials: L
authors.lastname: Junwen
authors.affiliation: Institute of Environmental Sciences of Aragon (IUCA), Zaragoza University, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain.
authors.forename: Laura
authors.initials: L
authors.lastname: Sánchez-García
authors.affiliation: Environmental Biology Laboratory, Department of Plant Sciences, Quaid-I-Azam University, Islamabad 45320, Pakistan. Electronic address: r_n_malik2000@yahoo.co.uk.
authors.forename: Riffat Naseem
authors.initials: RN
authors.lastname: Malik
authors.affiliation: Environmental Biology Laboratory, Department of Plant Sciences, Quaid-I-Azam University, Islamabad 45320, Pakistan.
authors.forename: Muhammad Jamshed Iqbal
authors.initials: MJ
authors.lastname: Chaudhry
authors.affiliation: WWF - Pakistan, Ferozpur Road, P O Box 5180, Lahore 54600, Pakistan.
authors.forename: Masood
authors.initials: M
authors.lastname: Arshad
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Gan
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Centre for Chemicals Management, Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK.
authors.forename: Kevin C
authors.initials: KC
authors.lastname: Jones
mesh_terms: D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis* / Q000737:chemistry; D008956:Models, Chemical; D009792:Oceans and Seas; D010154:Pakistan; D010575:Pesticides / Q000032:analysis / Q000737:chemistry; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000737:chemistry; D053260:Soot / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D053260:Soot; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls
keywords: Black carbon; Coastal sediments; Distribution status; Mass inventories; Organochlorines; Pakistan