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Abstract Accumulation

of organic and inorganic contaminants in shellfish collected in estuarine waters near Pensacola, Florida: Contamination profiles and risks to human consumers

Accumulation of organic and inorganic contaminants in shell?sh

collected in estuarine waters near Pensacola,Florida:Contamination pro?les and risks to human consumers

Natalie K.Karouna-Renier *,1,Richard A.Snyder,Jeffrey G.Allison,

Matthew G.Wagner,K.Ranga Rao

Center for Environmental Diagnostics and Bioremediation,University of West Florida,11000University Parkway,Pensacola,FL 32514,USA

Received 29July 2005;received in revised form 21April 2006;accepted 21April 2006

Elevated levels of dioxins/furans and dioxin-like PCBs were detected in blue crabs and oysters

from select locations in the Pensacola Bay region.

Abstract

We conducted a screening level assessment of contaminants in blue crabs (Callinectes sapidus )and oysters (Crassostrea virginica )from bays and bayous in the Pensacola,FL area.Tissue samples were analyzed for 17dioxins/furans,12dioxin-like PCB (DL-PCBs)congeners,mercury,and various metals.Contaminant levels were compared to screening values (SV)calculated using U.S.EPA recommendations for establishing consumption advisories.All sampling locations exceeded the SV (0.098pg g À1)for dioxins/furans/DL-PCBs,based on a Florida-speci?c con-sumption rate (46g day À1).Arsenic (inorganic),mercury,cadmium,and zinc levels exceeded SVs in samples from select locations,and with the exception of mercury,these locations were generally downstream of known contaminated areas.We also assessed potential human health risks from consumption of these species.Risks to human health were greatest from consumption of crab hepatopancreas,suggesting that consumption of hepatopancreas,whether directly or indirectly,from crabs collected anywhere in the Pensacola Bay region should be avoided.Ó2006Elsevier Ltd.All rights reserved.

Keywords:Blue crabs;Oysters;PCBs;Dioxins;Metals;Consumption risk

1.Introduction

The U.S.Environmental Protection Agency (U.S.EPA)re-ported that,for 2002,32.9%of the nation’s lake acreage,15.3%of the total river miles,100%of the Great Lakes and their connecting water bodies,and 71%of coastal waters,in-cluding 100%of the Gulf Coast were under ?sh consumption advisories (U.S.EPA,2003).Although 39chemicals were re-sponsible for the advisories,mercury,PCBs,chlordane,

dioxins,and DDT accounted for the majority (96%)of con-sumption restrictions.These chemicals accumulate in the tis-sues of aquatic organisms at concentrations many times higher than concentrations in water,and may be biomagni?ed in the food chain to levels that cause physiological impairment at higher trophic levels and in human consumers.Although a number of these chemicals are no longer used or manufac-tured in the United States,studies have shown that they con-tinue to accumulate in a variety of foods,including shell?sh (Jensen and Bolger,2001).For example,over 90%of human exposure to organochlorine compounds occurs through diet,primarily through seafood and meat (Smith and Gangolli,2002).Segments of the human population with increased ex-posure risk include consumers of commercially harvested sea-food,recreational and subsistence ?shers.

*Corresponding author.Tel.:þ130********;fax:þ130********.E-mail address:nkarouna@usgs.gov (N.K.Karouna-Renier).1

Present address:U.S.Geological Survey e Patuxent Wildlife Research Center,Beltsville Laboratory,C/O BARC East,Bldg 308,10300Baltimore Avenue,Beltsville,MD 20705,USA.

0269-7491/$-see front matter Ó2006Elsevier Ltd.All rights reserved.

Abstract Accumulation

Abstract Accumulation

doi:10.1016/j.envpol.2006.04.035

Environmental Pollution 145(2007)474e

Abstract Accumulation

488

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