Yellow And East China Sea Shelf Sediments Of Heavy Metal Pollution Record And Evaluation For A Long Time

Heavy metal has large toxicity, and can accumulate in plants and animals for along time, so it has important environmental significance. The sediments play animportant role of indication of heavy metal contaminated in the water, most of heavymetals into the water through absorption of suspended solids and eventuallytransferred to the sediments, sediment can be demonstrated by a significant heavymetal spatial and temporal distribution. Yellow and East China Sea affected by humanactivities, taking into account the impact of human activities increased significantlysince the mid-19th century industrial revolution, this paper looks at a representative ofthe yellow and east China Sea35N anaerobic zone, the sediment cores go of section Aand section B, removal of the heavy metal content of the sediment grain size, heavymetal distribution in the area from the perspective of time and space analysis.This survey’s stations located in the Yellow and East China Sea, all samples werecollected by the Big Dipper and the red numbers on the2nd survey ship Orient, a totalof38stations, including30surface samples, short sample column7, and long samplecolumn1. In this paper, collected sediment cores were measured210Pb, and draw avertical pillar-like distribution in210Pb activity, has derived the deposition rate, usingthe deposition rate we can complete210Pb dating; using atomic absorption methodforCu,Pb, Zn and Cd four heavy metal samples detection; utilization measured by laserdiffraction method had a specific surface area of heavy metals detected in sedimentsamples. Calculated by comparing the relationship between heavy metal content of thesediment surface area, and then amended the cores and surface samples for heavy metal content, obtained its actual content.210Pb dating and got through the heavy metalcontent varies with the historical background of heavy metal and then calculate itsvalue.Through this study showed that:1.Through the heavy metal content of the sediments and their specific surface area andthe ratio of the linear regression found that the content of heavy metals in sedimentsand its surface area has a significant positive correlation, and correlation coefficientsdetermined by linear regression equation, and then get the ratio of surface area heavymetal content of the equation. By this equation the concentration of heavy metals inthe sediment into different specific surface area than the surface area of a singlecorrection value.2.Through the analysis and correction values for reference and historical literature canbe found in the content of heavy metals in sediments in recent years has significantlyincreased. The content of the industrial revolution no significant change before.Description of the industrial revolution surveyed Yellow Sea area after a certain degreeof pollution. It can also be heavy metal content value is not large changes before theindustrial revolution were not calibrated to the ideal background values contamination.3.Through the numerous coastal sites like surface detection, and background valuesobtained for comparison, the Yellow Sea coast of the heavy metal pollution. As can beseen from shore to shore elevated levels of heavy metals in general, and with theimpact marine hydrological and other environmental factors were partially change thesituation. Indirectly reflect the human impact of heavy metal pollution.