钦州湾表层沉积物重金属分布特征

根据钦州湾表层沉积物中重金属元素Hg、Cd、Pb、Cu、As、Cr、Zn监测数据,利用数理统计和surfer软件对这7中重金属元素含量及其空间分布特征进行分析与评价.结果显示,表层沉积物中Zn和Cu的含量最大值分别是182×10-6和36.7×10-6,超过《海洋沉积物质量》（GB18668-2002）一类标准,其他元素含量的最大值均符合一类标准;钦州湾内湾沉积物质量较外湾差;重金属浓度较高的区域主要为龙门水道,其次是钦江口和犀牛脚镇沿岸海域.龙门水道大部分重金属含量较高可能是由于内湾携带大量污染物的较强径流与外湾海水在此交汇沉降所致,此外,还可能与龙门水道狭窄,地形复杂,岛屿众多等因素有关.

Spatial Distribution of Heavy Metals in Surface Sediment from Qin Zhou Bay

Based on the monitoring data of heavy metal in surface sediment, the content and distribution of heavy metals in Qin Zhou Bay were studied using statistics and the Surfer Software. The results showed that the maximum concentration of Zn and Cu exceeded that stated in first standard of ＂marine sediment quality＂ （GB18668--2002）,while the maximum concentration of other elements were lower than or same as that stated in the first standard. The sediment quality of inner bay was worse than that of outer bay. The order of high con- centration area was Longmen waterway, Qin river estuary and the coast of Xi Niujiao town.