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本文通过长箱式静压取样器及挖探槽采集了渤海湾及其毗邻河口区10个柱状沉积物岩芯样品,结合~(210)Pb测年、沉积物重金属分析,测定了沉积速率、重金属环境背景值及渤海湾4个时期(1982、1974、1964、1933)Zn、Cd的人为增量。沉积速率变化范围:1.8—44.2mm/a。分析表明:高速沉积区位于蓟运河口、海河口及废黄河口;低速沉积区位于渤海湾中部。从1933年起,由于人类活动增加,岩芯样中Zn、Cd含量开始累积。渤海湾Zn、Cd环境背景值分别为71.11—74.20×10~(-6)和0.100—0.120×10~(-6)。Zn、Cd最高值位于海河口,分别高出背景1.32和1.90倍。1982年输入到河口及湾内的Zn、Cd人为负荷量依次为249.32t和 5.41t,它们分别占污染区Zn、Cd自然负荷量的26.58%和30.81%。
In this paper, 10 samples of columnar sediments from Bohai Bay and adjacent estuaries were collected by long box-type hydrostatic sampler and digging trenches. Combined with ~ (210) Pb dating and heavy metal analysis of sediments, the sedimentation rate, The background value of heavy metals and the man-made increments of Zn and Cd in Bohai Bay during the four periods (1982,1974,1964,1933). Deposition rate range: 1.8-44.2mm / a. The analysis shows that the high-speed depositional area is located in the Jiyun River estuary, the Haihe River estuary and the waste Yellow River estuary. The low-speed sedimentary basin is located in the central Bohai Bay. Since 1933, due to the increase of human activities, the Zn and Cd contents in core samples began to accumulate. The environmental background values of Zn and Cd in Bohai Bay were 71.11-74.20 × 10 -6 and 0.100-0.120 × 10 -6, respectively. The highest values of Zn and Cd are located in Haihekou, which are respectively 1.32 and 1.90 times higher than the background. In 1982, the man-made loads of Zn and Cd input into the estuary and bay were 249.32t and 5.41t respectively, accounting for 26.58% and 30.81% of the natural load of Zn and Cd respectively in the contaminated area.