中国乌达煤炭基地尘土汞分布特征

发布时间：2018-06-05 23:38

  本文选题：乌达 + 煤火　； 参考：《中国环境科学》2017年06期

【摘要】：针对乌达区约200km~2的区域按照1km网格法在185个点位采集了约1.5mm厚度的地表尘土样.热解-Lumex RA-915汞分析仪对其测试结果表明:煤矿区尘土汞含量范围117~765ng/g,平均值为285ng/g;工业园尘土汞含量范围160~6453ng/g,平均值为804ng/g;城区尘土汞含量范围41~382ng/g,平均值为160ng/g;农场尘土汞含量范围16~198ng/g,平均值为66ng/g;荒地尘土范围3~284ng/g,平均值为50ng/g.乌达区尘土汞分布具有显著的非均一性.与乌达区背景值(18ng/g)和中国潮土背景值(50ng/g)相比较,乌达工业园和煤矿区尘土汞明显富集.与国内金属矿区、城区尘土Hg含量相比,乌达煤矿区、城区尘土Hg含量较低;煤矿区尘土汞与煤火区、矸石山相对位置和本身地势有关;城区位于煤矿区下风向,受煤矿区煤火影响,植被稀少、空气干燥和夏季日照较长成为制约汞沉降的主控因素;工业园区的极大值点可能与区域地理位置和PVC生产相关.通过计算Igeo值,发现乌达区工业园污染严重,偏重污染区域占全区36.59%,7.32%达到极重污染程度;煤矿区多为偏中污染和中污染,在全区所占比例为84.09%,偏重污染区域仅为2.27%;城区、农场和荒地污染较少.
[Abstract]:According to the 1km grid method, dust samples of about 1.5mm thickness were collected at 185 points in the area of 200km~2 in Uda area. The test results of pyrolytic -Lumex RA-915 mercury analyzer show that: coal mine dust mercury content range 117765 ng / g, the average value is 285 ng / g; industrial park dust mercury content range 160 ~ 6453 ng / g, average is 804 ng / g; urban dust mercury content range 41382 ng / g, average is 160 ng / g; Farm dust mercury contains 160 ng / g; The amount ranges from 16 to 198 ng / g, with an average of 66 ng / g, and the dust range of wasteland is 3284 ng / g, with an average value of 50 ng / g. The distribution of dusty mercury in Uda area has remarkable heterogeneity. Compared with the background value of 18 ng / g in the Wuda area and 50 ng / g of the background value of the tidal soil in China, the dust mercury in the Wuda Industrial Park and the coal mining area is obviously enriched. Compared with domestic metal mining area and urban dust Hg content, the dust Hg content in Wuda coal mine area is lower, the relative position of coal mine dust mercury and coal fire area is related to the relative position of gangue mountain, and the urban area is located in the wind direction under coal mine area. Under the influence of coal and fire in coal mining area, vegetation is scarce, air drying and summer sunshine are the main controlling factors, and the maximum point of industrial park may be related to regional geographical location and PVC production. Through the calculation of Igeo value, it is found that the industrial park in Wuda district is polluted seriously, the heavily polluted area accounts for 36.597.32% of the total area, and the coal mine area is mostly moderately polluted and moderately polluted, the proportion in the whole area is 84.09, and the partial pollution area is only 2.27%. Farms and wasteland are less polluted.
【作者单位】： 中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;中国矿业大学(北京)地球科学与测绘工程学院;
【基金】：国家自然科学基金(41371449)
【分类号】：X513;X752
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本文编号：1983918