摘要
于2008-2012年间在南海北部沿岸海域的23个重要港湾采集近江牡蛎（Crassostrea rivularis Gould）样品，用气相色谱法测定其中多氯联苯（PCBs）的残留量，并对其残留水平、时空分布趋势、组成特征以及食用安全性进行探讨与评价.结果表明：南海北部沿岸牡蛎体内的PCBs的含量范围在8.11～29.10ng／g之间（湿重,下同），平均值是（16.574±4.40）ng／g，出现频率呈正态分布.在时间上，广东、广西和海南沿岸PCBs含量随时间呈下降的总体趋势；空间分布上，珠江口岸段PCBs含量明显高于粤东、粤西、广西和海南4个岸段.PCBs同系物中以五氯联苯在总PCBs含量最高，占47.9％，其次是三氯和四氯联苯，二者之和占总PCBs的30.6％；同系物以PCB105、PCB118和PCB101＋113为优势组分，3者之和占总量的百分比为24.O％.南海北部沿岸牡蛎体内的PCBs残留量远低于国内外相关食品安全限量标准，估算的沿海居民食用牡蛎的PCBs暴露量为5.52ng／（kg·d），仅占世界卫生组织（WHO）设定的每日耐受量值的27.6%.PCBs的二噁（口英）毒性当量frEQ）平均值为39.4pg／g.
In each March during 2006-2012, oyster samples （Crassostrea rivularis Gould ） were collected from 23sampling sites along the northern coast of the South China Sea. Gas chromatography with electron capture detector was used to determine the contents, the residues levels, spatial and temporal trends, compositions of PCBs, as well as the risk to human health were analyzed and assessed. The results showed that PCBs contents ranged from 8.11 to 29.10ng/g with an average of 16.57ng/g on wet weight basis. PCBs contents in oysters along the northern coast of the South China Sea presented a general trend of descending. PCBs contents in Pearl River Estuary were significantly higher than East Guangdong coast, West Guangdong coast, Guangxi coast and Hainan coast. The contents of pentachlorobiphenyls were the highest in all of the PCBs homologs groups, occupying 47.9%, foUowed by trichlorodiphenyls and tetrachlorobiphenyls, occupying 30.6% in total. The contents of PCB105,PCB 118 ~ PCB101＋I 13were dominated in all of the congeners, three of them occupied 24.0%. The PCBs residues levels of all oyster samples were far below the limits of food security standards published at home and abroad, and the estimated uptake amount of PCBs is only 27.6% of TDI regulated by WHO, indicating that the health risk arising from the exposure to PCBs is small. The average TEQ of PCBs in tissues of oysters is 39.4pg/g.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2013年第10期1791-1798,共8页
China Environmental Science
基金
科技部科研院所社会公益研究专项(2005DIB3J021)
广东省科技计划项目(2009B030600001
2011A050902006)
中央级公益性科研院所基本科研业务费专项资金项目(2009YD01
2010YD04
2010TS12)
广东省渔业生态环境重点实验室重点开放课题(GDKL2010-001)
关键词
牡蛎
PCBS
时空变化
南海北部沿岸
oysters
PCBs
spatial-temporal character
the northern coast of the South China Sea
