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Environmental Earth Sciences

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01.05.2011 | Original Article

Polycyclic aromatic hydrocarbons in surface sediments of Laizhou Bay, Bohai Sea, China

verfasst von: Ning Jing Hu, Xue Fa Shi, Peng Huang, Ji Hua Liu

Erschienen in: Environmental Earth Sciences | Ausgabe 1/2011

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Abstract

Concentration, distribution, and sources of 16 polycyclic aromatic hydrocarbons (PAHs) were investigated in surface sediments of Laizhou Bay, China. Total PAH concentrations ranged from 97.2 to 204.8 ng/g, with a mean of 148.4 ng/g. High concentrations of PAHs were found in the fine-grained sediments on both sides of the Yellow River estuary (YRE). In contrast, low levels of PAHs were observed in relatively coarse grain sediments, suggesting hydrodynamics influence the accumulation of sedimentary PAHs. The YRE and its adjacent area is the main sink for Yellow River-derived PAHs. Both PAH isomer ratios and principal component analysis (PCA) with multivariate linear regression (MLR) were applied to apportion sources of PAHs. Results indicated that both pyrogenic and petrogenic PAH sources were important. Further PCA/MLR analysis showed that the contributions of coal combustion, petroleum combustion and a combined source of spilled oil and biomass burning were 41, 15 and 44%, respectively. From an ecotoxicological viewpoint, the studied area appears to have low levels of PAH pollution.

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Baumard P, Budzinski H, Garrigues P, Sorbe JC, Burgeot T, Bellocq J (1998) Concentration of PAHs (polycyclic aromatic hydrocarbons) in various marine organisms in relation to those in sediments and to tropic level. Mar Pollut Bull 30:951–960CrossRef

Behymer TD, Hites RA (1988) Photolysis of polycyclic aromatic hydrocarbons adsorbed on fly ash. Environ Sci Technol 22:1311–1319CrossRef

Boonyatumanond R, Wattayakorn G, Togo A, Takada H (2006) Distribution and origins of polycyclic aromatic hydrocarbons (PAHs) in riverine, estuarine, and marine sediments in Thailand. Mar Pollut Bull 52:942–956CrossRef

Boonyatumanond R, Murakami M, Wattayakorn G, Togo A, Takada H (2007) Sources of polycyclic aromatic hydrocarbons (PAHs) in street dust in a tropical Asian mega-city, Bangkok, Thailand. Sci Total Environ 384:420–432CrossRef

Bordovskiy OK (1965) Accumulation of organic matter in bottom sediments. Mar Geol 3:33–82CrossRef

Chen JL, Liu WX, Liu SZ, Lin XM, Tao S (2004) An evaluation on heavy metal contamination in the surface sediments in Bohai Sea (in Chinese). Mar Sci 28(12):16–21

Chu ZX, Sun XG, Zhai SK, Xu KH (2006) Changing pattern of accretion/erosion of the modern Yellow River (Huanghe) subaerial delta, China: based on remote sensing images. Mar Geol 227:13–30CrossRef

Datta DK, Gupta LP, Subramanian V (1999) Distribution of C, N and P in the sediments of the Ganges–Brahmaputra–Meghna river system in the Bengal basin. Org Geochem 30:75–82CrossRef

Duval MM, Friedlander SK (1981) Source resolution of polycyclic aromatic hydrocarbons in the Los Angeles atmospheres: application of a cmb with first order decay. U.S. EPA Report EPA-600/2-81-161, Washington, DC

Fraser MP, Cass GR, Simoneit BR, Rasmussen RA (1998) Air quality model evaluation data for organics. 5. C6–C22 nonpolar and semipolar aromatic compounds. Environ Sci Technol 32:1760–1770CrossRef

Freeman DJ, Cattell FCR (1990) Woodburning as a sources of atmospheric polycyclic aromatic hydrocarbons. Environ Sci Technol 24:1581–1585CrossRef

Goñi MA, Ruttenberg KC, Eglinton TI (1998) A reassessment of the sources and importance of land-derived organic matter in surface sediments from the Gulf of Mexico. Geochim Cosmochim Acta 62:3055–3075CrossRef

Goñi MA, Maria JT, David WP (2003) Sources and distribution of organic matter in a river-dominated estuary (Winyah Bay, SC, USA). Estuar Coast Shelf Sci 57:1023–1048CrossRef

Guo ZG, Sheng LF, Feng JL, Fang M (2003) Seasonal variation of solvent extractable organic compounds in the aerosols in Qingdao, China. Atmos Environ 37:1825–1834CrossRef

Guo ZG, Lin T, Zhang G, Yang ZS, Fang M (2006) High-resolution depositional records of polycyclic aromatic hydrocarbons in the central continental shelf mud of the east China sea. Environ Sci Technol 40:5304–5311CrossRef

Guo W, He M, Yang Z, Lin C, Quan X, Wang H (2007) Distribution of polycyclic aromatic hydrocarbons in water, suspended particulate matter and sediment from Daliao River watershed, China. Chemosphere 68:93–104CrossRef

Harrison RM, Smith DJT, Luhana L (1996) Source apportionment of atmospheric polycyclic aromatic hydrocarbons collected from an urban location in Birmingham UK. Environ Sci Technol 30:825–832CrossRef

Hu LM, Guo ZG, Feng JL, Yang ZS, Fang M (2009) Distributions and sources of bulk organic matter and aliphatic hydrocarbons in surface sediments of the Bohai Sea, China. Mar Chem 113:197–211CrossRef

Hu NJ, Shi XF, Liu JH, Huang P, Liu YG, Liu Y (2010) Concentrations and possible sources of PAHs in sediments from Bohai Bay and adjacent shelf. Environ Earth Sci 60(8):1771–1782. doi:10.1007/s12665-009-0313-0

Huang DJ, Su JL (2002) The effects of the Huanghe River delta on the circulation and transportation of larvae (in Chinese). Acta Oceanologica Sinica 24(6):104–111

IRTCES (International Research and Training Center on Erosion and Sedimentation) (2005) Bulletin of Chinese River Sediment (2004) (in Chinese). Ministry of Water Resources Conservancy, Beijing, China. Available at http://www.irtces.org/database.asp

Jiang B, Zheng HL, Huang GQ, Ding H, Li XG, Suo HT, Li R (2007) Characterization and distribution of polycyclic aromatic hydrocarbon in sediments of Haihe River, Tianjin, China. J Environ Sci 19:306–311CrossRef

Jin J, Liu WZ, Wang Y, Tang XY (2008) Levels and distribution of polybrominated diphenyl ethers in plant, shellfish and sediment samples from Laizhou Bay in China. Chemosphere 71:1043–1050CrossRef

Kannan K, Johnson-Restrepo B, Yohn SS, Giesy JP, Long DT (2005) Spatial and temporal distribution of polycyclic aromatic hydro- carbons in sediments from Michigan inland lakes. Environ Sci Technol 39:4700–4706CrossRef

Khalili NR, Scheff PA, Holsen TM (1995) PAH source fingerprints for coke ovens, diesel and gasoline engines, highway tunnels, and wood combustion emissions. Atmos Environ 29:533–542CrossRef

Kim EJ, Oh JE, Chang YS (2003) Effects of forest fire on the level and distribution of PCDD/Fs and PAHs in soil. Sci Total Environ 311:177–189CrossRef

Larsen RK, Baker JE (2003) Source apportionment of polycyclic aromatic hydrocarbons in the urban atmosphere: a comparison of three methods. Environ Sci Technol 37:1873–1881CrossRef

Lemieux PM, Lutes CC, Santoianni DA (2004) Emission of organic air toxics from open burning: a comprehensive review. Prog Energy Combust Sci 30:1–32CrossRef

Li GX, Tang Z, Yue S, Zhuang K, Wei H (2001a) Sedimentation in the shear front off the Yellow River mouth. Cont Shelf Res 21(6–7):607–625CrossRef

Li RW, Li H, Li Y, Zhang SK, Qian Z, Ma ZP, Jiang ZX (2001b) Study of the heavy metals, Nitrogen and phosphorus contaminants in the sediments of the Yellow River Delta (in Chinese). Acta Sedimentol Sin 19(4):622–629

Li GC, Xia XH, Yang ZF, Wang R, Voulvoulis N (2006) Distribution and sources of polycyclic aromatic hydrocarbons in the middle and lower reaches of the Yellow River, China. Environ Pollut 144:985–993CrossRef

Lima AL, Farrington JW, Reddy CM (2005) Combustion-derived polycyclic aromatic hydrocarbons in the environment—a review. Environ Forensics 6:109–131CrossRef

Lin C, Su J, Xu B, Tang Q (2001) Long-term variations of temperature and salinity of the Bohai Sea and their influence on ecosystem. Prog Oceanogr 49:7–19CrossRef

Liu WX, Chen JL, Lin XM, Tao S (2006) Distribution and characteristics of organic micropollutants in surface sediments from Bohai Sea. Environ Pollut 140:4–8CrossRef

Liu WX, Chen JL, Lin XM, Fan YS, Tao S (2007a) Residual concentrations of micropollutants in benthic mussels in the coastal areas of Bohai Sea, North China. Environ Pollut 146:470–477CrossRef

Liu WX, Chen JL, Lin XM, Tao S (2007b) Spatial distribution and species composition of PAHs in surface sediments from the Bohai Sea. Mar Pollut Bull 54:97–116CrossRef

Liu Y, Chen L, Zhao JF, Huang QH, Zhu ZL, Gao HW (2008) Distribution and sources of polycyclic aromatic hydrocarbons in surface sediments of rivers and an estuary in Shanghai, China. Environ Pollut 154:298–305CrossRef

Liu Y, Chen L, Huang QH, Li WY, Tang YJ, Zhao JF (2009) Source apportionment of polycyclic aromatic hydrocarbons (PAHs) in surface sediments of the Huangpu River, Shanghai, China. Sci Total Environ 407:2931–2938CrossRef

Long ER, MacDonald DD, Smith SJ, Calder FD (1995) Incidence of adverse biological effects within ranges of chemical concentrations in marine and estuarine sediments. Environ Manag 19:81–97CrossRef

Lu CH (2000) Year book of Chinese energy, 1997–1999. Chinese Statistical Press, Beijing, pp 178–181

Ma M, Feng Z, Guan C, Ma Y, Xu H, Li H (2001) DDT, PAH and PCB in sediments from the intertidal zone of the Bohai Sea and the Yellow Sea. Mar Pollut Bull 42(2):132–136CrossRef

Macias-Zamora JV, Mendoza-Vega E, Villaescusa-Celaya JA (2002) PAHs composition of surface marine sediments: a comparison to potential local sources in Todos Santos Bay, BC, Mexico. Chemosphere 46:459–468CrossRef

Mai BX, Fu JM, Zhang G, Lin Z, Min YS, Sheng GY, Wang XM (2001) Polycyclic aromatic hydrocarbons in sediments from the Pearl river and estuary, China: spatial and temporal distribution and sources. Appl Geochem 16:1429–1445CrossRef

Mai BX, Fu JM, Sheng GY, Kang YH, Lin Z, Zhang G, Min YS, Zeng EY (2002) Chlorinated and polycyclic aromatic hydrocarbons in riverine and estuarine sediments from Pearl River Delta, China. Environ Pollut 117:457–474CrossRef

Mao XY, Jiang WS, Zhao P, Gao HW (2008) A 3-D numerical study of salinity variations in the Bohai Sea during the recent years. Cont Shelf Res 28(19):2689–2699CrossRef

May WE, Wise SA (1984) Liquid chromatographic determination of polycyclic aromatic hydrocarbons in air particulate extracts. Anal Chem 56:225–232CrossRef

Men B, He MC, Tan L, Lin CY, Quan XC (2009) Distributions of polycyclic aromatic hydrocarbons in the Daliao River Estuary of Liaodong Bay, Bohai Sea (China). Mar Pollut Bull 58:818–826CrossRef

Meyers PA (1997) Organic geochemical proxies of paleoceanographic, paleolimnlogic, and paleoclimatic processes. Organic Geochem 27:213–250CrossRef

Müller PJ (1977) C/N ratio in Pacific deep-sea sediments: effect of inorganic ammonium and organic nitrogen compounds absorbed by clays. Geochim Cosmochim Acta 41:765–776CrossRef

National Bureau of Statistics of China (NBSC) (1996) Statistical yearbook of China. China Statistics Press, Beijing

National Bureau of Statistics of China (NBSC) (2008) Statistical yearbook of China. China Statistics Press, Beijing

Oros DR, Ross JRM (2004) Polycyclic aromatic hydrocarbons in San Francisco Estuary sediments. Mar Chem 86:169–184CrossRef

Pichler M, Guggenburger G, Hartmann R, Zech W (1996) Polycyclic aromatic hydrocarbons (PAH) in different forest humus types. Environ Sci Technol Res 3:24–31

Qiao SQ, Shi XF, Zhu AM, Liu YG, Bi NS, Fang XS, Yang G (2009) Distribution and transport of suspended sediments off the Yellow River (Huanghe) mouth and the nearby Bohai Sea. Estuar Coast Shelf Sci. doi:10.1016/j.ecss.2009.07.019

Redfield AC, Ketchum BH, Richards FA (1963) The influence of organisms on the composition of sea water. In: Hill MN (ed) The sea. Wiley, New York, pp 26–77

Ren ME, Shi YL (1986) Sediment discharge of the Yellow River (China) and its effect on the sedimentation of the Bohai and the Yellow Sea. Cont Shelf Res 6:785–810CrossRef

Schubert CJ, Calvert SE (2001) Nitrogen and carbon isotopic composition of marine and terrestrial organic matter in Arctic Ocean sediments: implications for nutrient utilization and organic matter composition. Deep Sea Res 48:789–810CrossRef

Shepard FP (1954) Nomenclature based on sand–silt–clay ratios. J Sedment Petrol 24:151–158

Shi Z, Tao S, Pan B, Fan W, He XC, Zuo Q, Wu SP, Li BG, Cao J, Liu WX, Xu FL, Wang XJ, Shen WR, Wong PK (2005) Contamination of rivers in Tianjin, China by polycyclic aromatic hydrocarbons. Environ Pollut 134:97–111CrossRef

Soclo HH, Garrigues P, Ewald M (2000) Origin of polycyclic aromatic hydrocarbons (PAHs) in coastal marine sediments: case studies in Cotonou (Benin) and Aquitaine (France) areas. Mar Pollut Bull 40:387–396CrossRef

Stein R (1991) Accumulation of organic carbon in marine sediments. In: Bhattacharji S, Friedman GM, Neugebauer HJ, Seilacher A (eds) Results from deep sea drilling project/ocean drilling program. Lectures notes in earth sciences. Springer, Berlin

Suguio K (1973) Introducção à sedimentologia. Edgard Blucher/EDUSP, São Paulo

Sündermanm J, Feng SZ (2004) Analysis and modeling of the Bohai Sea ecosystem—a joint German–Chinese study. J Mar Syst 44:127–140CrossRef

Venkatesan MI (1988) Occurrence and possible sources of perylene in marine sediments—a review. Mar Chem 25:1–27CrossRef

Wang CY, Wang XL (2007) Spatial distribution of dissolved Pb, Hg, Cd, Cu and As in the Bohai Sea. J Environ Sci 19:1061–1066CrossRef

Wang HJ, Yang ZS, Li YH, Guo ZG, Sun XX, Wang Y (2007a) Dispersal pattern of suspended sediment in the shear frontal zone off the Huanghe (Yellow River) mouth. Cont Shelf Res 27(6):854–871CrossRef

Wang L, Lee FSC, Wang XR, Yin YF, Li JR (2007b) Chemical characteristics and source implications of petroleum hydrocarbon contaminants in the sediments near major drainage outfalls along the coastal of Laizhou Bay, Bohai Sea, China. Environ Monit Assess 125:229–237CrossRef

Wang H, Yang ZS, Saito Yoshiki, Liu J. Paul, Sun XX, Wang Y. (2007c) Stepwise decreases of the Huanghe (Yellow River) sediment load (1950–2005): impacts of climate change and human activities. Glob Planet Change. doi:10.1016/j.gloplacha.2007.01.003

Wang LL, Yang ZF, Niu JF, Wang JY (2009) Characterization, ecological risk assessment and source diagnostics of polycyclic aromatic hydrocarbons in water column of the Yellow River Delta, one of the most plenty biodiversity zones in the world. J Hazard Mater 169:460–465CrossRef

Wu GQ (1992) The study on dynamic mechanism for formation of muddy sediment at present Yellow River estuary (in Chinese). Coast Eng 11(2):44–52

Wu Y, Zhang J (2001) Distribution of polycyclic aromatic hydrocarbon in core sediments of the Bohai straight (in Chinese). Environ Sci 22(3):74–77

Xi JZ (1996) Water resources of the Yellow River. Publishing House of Water Resources, Zhengzhou, China

Xia XH, Zhou JS, Yang ZF (2002) Nitrogen contamination in the Yellow River Basin of China. J Environ Qual 31:917–925CrossRef

Xu SS, Liu WX, Tao S (2006) Emission of polycyclic aromatic hydrocarbons in China. Environ Sci Technol 40(3):702–708CrossRef

Xu J, Yu Y, Wang P, Guo WF, Dai SG, Sun HW (2007a) Polycyclic aromatic hydrocarbons in the surface sediments from Yellow River, China. Chemosphere 67:1408–1414CrossRef

Xu XQ, Yang HH, Li QL, Yang BJ, Wang XR, Lee FSC (2007b) Residues of organochlorine pesticides in near shore waters of LaiZhou Bay and JiaoZhou Bay, Shandong Peninsula, China. Chemosphere 68:126–139CrossRef

Yan W, Chi JS, Wang ZY, Huang WX, Zhang G (2009) Spatial and temporal distribution of polycyclic aromatic hydrocarbons (PAHs) in sediments from Daya Bay, South China. Environ Pollut 157(6):1823–1830

Yang GP (2000) Polycyclic aromatic hydrocarbons in the sediments of the South China Sea. Environ Pollut 108:163–171CrossRef

Yang RQ, Yao ZW, Jiang GB, Zhou QF, Liu JY (2004) HCH and DDT residues in molluscs from Chinese Bohai coastal sites. Mar Pollut Bull 48:795–805CrossRef

Yang ZF, Wang LL, Niu JF, Wang JY, Shen ZY (2009) Pollution assessment and Source identifications of polycyclic aromatic hydrocarbons in sediments of the Yellow River Delta, a newly born wetland in China. Environ Monit Assess 158:561–567CrossRef

Ye BX, Zhang ZH, Mao T (2006) Pollution sources identification of polycyclic aromatic hydrocarbons of soils in Tianjin area, China. Chemosphere 64:525–534CrossRef

Yu GG, Wang TG, Wu DP, Wang J (2008) A study of polycyclic aromatic hydrocarbons present in Beijing Aerosols (in Chinese). J China Univ Min Technol 37(1):72–78

Yuan DX, Yang DN, Wade TL, Qian YR (2001) Status of persistent organic pollutants in the sediment from several estuaries in China. Environ Pollut 114:101–111CrossRef

Yunker MB, Macdonald RW, Veltkamp DJ, Cretney WJ (1995) Terrestrial and marine biomarkers in a seasonally ice-covered Arctic estuary—integration of multivariate and biomarker approaches. Mar Chem 49:1–50CrossRef

Yunker MB, Snowdon LR, MacDonald RW, Smith JN, Fowler MG, Skibo DN, McLaughlin FA, Danyushevskaya AI, Petrova VI, Ivanov GI (1996) Polycyclic aromatic hydrocarbon composition and potential sources for sediment samples from the Beaufort and Barents Seas. Environ Sci Technol 30:1310–1320CrossRef

Yunker MB, Macdonald RW, Vingarzan R, Mitchell RH, Goyette D, Sylvestre S (2002) PAHs in the Fraser River basin: a critical appraisal of PAH ratios as indicators of PAH source and composition. Org Geochem 33:489–515CrossRef

Zaghden H, Kallel M, Elleuch B, Oudot J, Saliot A (2007) Source and distribution of aliphatic and polycyclic aromatic hydrocarbons in sediments of Sfax, Tunisia, Mediterranean Sea. Mar Chem 105:70–89CrossRef

Zakaria MP, Takada H, Tsutsumi S, Ohno K, Yamada J, Kouno E, Kumata H (2002) Distribution of polycyclic aromatic hydrocarbons (PAHs) in rivers and estuaries in Malaysia: a widespread input of petrogenic PAHs. Environ Sci Technol 36:1907–1918CrossRef

Zhang J, Cai LZ, Yuan DX, Chen M (2004a) Distribution and sources of polynuclear aromatic hydrocarbons in Mangrove surficial sediments of Deep Bay, China. Mar Pollut Bull 49:479–486CrossRef

Zhang ZH, Tao S, Ye BX, Peng ZQ, Yuan JP (2004b) Pollution sources and identification of hydrocarbons in soil and sediment using molecular makers (in Chinese). Chin J Soil Sci 35:793–798

Zhang HB, Luo YM, Wong MH, Zhao QG, Zhang GL (2006a) Distributions and Concentrations of PAHs in Hong Kong Soils. Environ Pollut 141:107–114CrossRef

Zhang ZH, Zhu MY, Wang ZL, Wang J (2006b) Monitoring and managing pollution load in Bohai Sea, PR China. Ocean Coast Manag 49:706–716

Zhao BR, Zhuang GW, Cao DM, Lei FH (1995) Circulation, tidal residual currents and their effects on the sedimentations in the Bohai Sea. Oceanologia ET Limnologia Sinica 26(5):466–473

Zhou JL, Maskaoui K (2003) Distribution of polycyclic aromatic hydrocarbons in water and surface sediments from Daya Bay, China. Environ Pollut 121:269–281CrossRef

Zhou JL, Hong H, Zhang Z, Maskaou K, Chen W (2000) Multi-phase distribution of organic micropollutants in Xianmen harbour, China. Water Res 34(7):2132–2150CrossRef

Zuo Q, Duan YH, Yang Y, Wang XJ, Tao S (2007) Source apportionment of polycyclic aromatic hydrocarbons in surface soil in Tianjin, China. Environ Pollut 147:303–310CrossRef

Titel: Polycyclic aromatic hydrocarbons in surface sediments of Laizhou Bay, Bohai Sea, China
verfasst von: Ning Jing Hu
Xue Fa Shi
Peng Huang
Ji Hua Liu
Publikationsdatum: 01.05.2011
Verlag: Springer-Verlag
Erschienen in: Environmental Earth Sciences / Ausgabe 1/2011
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-010-0675-3

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