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根据 198 9～ 1997年广东沿岸 12个采样点近江牡蛎 (CrassostrearivularisGould)体Cd的测定数据和有关历史资料 ,分析了广东沿岸牡蛎体Cd含量与时空分布特点。所有牡蛎体样品均检出Cd ,含量为( 0 .0 8～ 7.81)× 10 - 6,总平均值为 1.92× 10 - 6。粤东与粤西沿岸除个别样品外 ,绝大部分Cd含量均远低于评价标准 ,而珠江口沿岸样品的超标率则达到 2 5%。牡蛎体Cd含量的空间分布呈珠江口 >粤西 >粤东。1989～ 1997年 ,牡蛎体Cd含量的年际变化呈双峰分布 ,次高值和最高值分别出现在 1992年和 1995年 ,其余年份虽有波动 ,但无显著差异。
According to the determination data and historical data of Cd from 12 sampling points in coastal Guangdong of China from1998 to 1997, the Cd content and spatial and temporal distribution characteristics of oysters in Guangdong were analyzed. Cd was detected in all the oyster samples, with the content of (0.08 ~ 7.81) × 10 - 6 and the average of 1.92 × 10 - 6. Except individual samples, the majority of Cd concentrations in eastern Guangdong and western Guangdong were much lower than the evaluation criteria, while the exceeding standard rate of samples along the coast of the Pearl River estuary reached 25%. The spatial distribution of Cd content in oyster was the Pearl River estuary> western Guangdong> eastern Guangdong. From 1989 to 1997, the interannual variation of Cd in oyster showed a bimodal distribution, with the next highest value and the highest value occurring in 1992 and 1995, respectively. There was no significant difference in other years though fluctuating.