作 者：
王清云;甘居利;陈海刚;马胜伟;张喆;蔡文贵;贾晓平
关键词：
近江牡蛎;DDTs;时空变化;组分特征;广东沿岸
摘 要：
为了解广东沿岸牡蛎体内滴滴涕(DDTs)的残留水平和时空分布情况,于1989—1993年和2003—2012年间每年3月份采集广东沿岸海域的近江牡蛎,用气相色谱法测定其DDTs的含量,同时结合1980—1985年广东省海岸带污染调查的相关数据,分析了广东沿岸牡蛎体内DDTs的残留量、时空分布和组成特征,并评价了其食用安全性与生物质量。结果显示,广东沿岸牡蛎体内DDTs检出率为96.9%,检出的样品中含量范围为0.11～76.3 ng/g,平均值是(3.87±7.40)ng/g。在时间上,广东沿岸牡蛎体内DDTs含量呈现明显的阶段性变化特点,20世纪80年代至90年代初期,为显著下降阶段,2003—2007年先小幅反弹后略微下降,2008—2012年总体呈归于平稳的趋势,且该时段各年份间无显著差异。空间上,20世纪80年代初期,珠江口岸段牡蛎体DDTs含量远高于粤东、粤西岸段,随着时间推移,3个岸段之间含量差距逐渐缩小,1989年之后各年间3个区域DDTs平均含量在统计学上没有显著差异。DDTs的组分特征分析显示,广东沿岸海域牡蛎体内DDTs主要来源于历史使用残留,但在1989—1993年和2003—2007年时段内可能有三氯杀螨醇来源的DDTs输入。结果表明,就DDTs而言,广东沿岸海域所有样品均未超我国相关残留限量标准,近年来大部分站点牡蛎食用安全,生物质量状况良好。
译 名：
Spatial-temporal distribution characteristics of DDTs in oysters (Crassotrea rivularis) along Guangdong coast,China
作 者：
WANG Qingyun1,2,GAN Juli1,CHEN Haigang1,2,MA Shengwei1, ZHANG Zhe1,CAI Wengui1,JIA Xiaoping1(1.South China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences, Key Laboratory of Fishery Ecology and Environment,Guangdong Province, Key Laboratory of South China Sea Fishery Resources Exploitation Utilization,Ministry of Agriculture, Scientific Observing and Experimental Station of South China Sea Fishery Resources DDTs Environments, Ministry of Agriculture,Guangzhou 510300,China; 2.College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China)
关键词：
Crassotrea rivularis;DDTs;spatial-temporal characteristics;Guangdong coast
摘 要：
In each spring during 1989—1993 and 2003—2012,oyster samples(Crassotrea rivularis Gould)were collected from 16 sites along Guangdong coast,China.The contents of DDTs(including o,p'-DDT,p,p'-DDT,p,p'-DDD,p,p'-DDE)were detected by gas chromatography with electron capture detector.Based upon the detected data of DDTs in oysters along Guangdong coast and the data taken from the pollution investigations of Guangdong coastal zone,China during 1980—1985,the residues levels,spatial and temporal trends and compositions of DDTs in oysters were analyzed and discussed.Also,food safety and biological quality of DDTs in oysters were assessed.The results indicated that DDTs was detected in 95.9% of the samples,and in the detectable samples,DDTs contents ranged from 0.11 to 76.3 ng/g with an average of 3.87 ng/g on wet weight basis.DDTs contents decreased obviously during the early period after DDTs was banned from 1980s to early 1990s,but presented a gentle increase owing to possible inputs of new DDTs in 2003—2007,and with the national implementation measures for the Stockholm Convention,DDTs contents maintained steady finally between in 2008—2012.In early 1980s,DDTs contents in Pearl River Estuary were much higher than East Guangdong coast and West Guangdong coast,but the difference of DDTs contents from these three coasts narrowed gradually with time and became not significant statistically since 1989(P>0.05).The composition analysis of DDTs in the oyster samples showed that DDTs residues were sourced mainly from the historical usage,but the higher ratios of DDT/(DDD+DDE)and o,p'-DDT/p,p'-DDT(>1)indicated that there was probably new input of DDTs which might come from dicofol in periods of 1989—1993 and 2003—2007.The DDTs residues levels of all oyster samples were below the national residual limit standards,during the period of 1980s—1990s and 2003—2007,there was only 4.6% of oyster samples exceeded US EPA reference limits(14.4 ng/g),and 6.7% of samples exceeded the requirement of the first grade of the National Marine Biological Quality Standard of China(10 ng/g).The biological quality of DDTs in oysters was good and the food safety has been acceptable in recent years.
