| 贵阳百花湖汞的地球化学研究 |
| 王战平
|
| 1993
|
| 学位授予单位 | 中国科学院地球化学研究所
|
| 学位授予地点 | 中国科学院地球化学研究所
|
| 学位名称 | 博士
|
| 关键词 | 二次污染
再悬浮
次生汞污染层
|
| 摘要 | 百花湖属岩溶山区严重汞污染湖泊，是二次污染的典型。过去二十多年在猫跳河上游河床中沉积的汞大部分已被流水携带转移到湖区，在湖底形成了厚度10－16厘米的次生汞染层，含汞量在1.2-33.5ppmpp之间，最大值出现在5厘米层位，向上或向下含汞量明显减少。底质汞以过氧化氢溶态为主，次为王水溶态和腐植酸结合态。底质汞无稳定化或矿化倾向。甲基汞的形成和释放只发生在表层。百花湖存在较强的再悬浮作用，水汞主要来自底质汞的再悬浮。湖水中甲基汞浓度：0.3ng/1左右，总汞浓度在10-81ppb之间。部分鲤鱼含汞量超出0.3ppm的食用标准。鲤鱼肌肉中大约90％的汞是甲基汞。 |
| 其他摘要 | Bai-hua Lake, which located in karst region, has been critically polluted by Hg for the past two decades. It's a typical example of secondary pollution. Most of the Hg formerly deposited in the upper reaches of the Mao-tiao River have been transferring to the lake by running water A secondary Hg polluted layer to a thickness of 10 to 16 cm with a Hg concentration of 1.2 to 33.5 ppm formed in the lake basin. Peak concentration appears in about 5 cm layer depth, the deeper and the upper Hg has an obvious and reguler decrease tedency. The main form of Hg in bottom sediments dissolves in H_2O_2, then in aqua regin and in rare-alkali. The forming and releasing of MeHg occur in surface layer only. Hg in bottom sediments havn't the tendency of stabilizing of mineralizing. There exist a strong recycling of Hg in the lake. The transporation of Hg from the bottom sediments to the lake waters if closely related to the second time suspension. In the lake waters, the MeHg concentrations are about 0.3 ng/1, the total Hg concentrations in carps exceed health administration guidelines of 0.3 μg/g(ww). About 90% of total Hg in carp's muscles in MeHg. |
| 页数 | 44
|
| 语种 | 中文
|
| 文献类型 | 学位论文
|
| 条目标识符 | http://ir.gyig.ac.cn/handle/352002/3930
|
| 专题 | 研究生_研究生_学位论文
|
推荐引用方式
GB/T 7714 |
王战平. 贵阳百花湖汞的地球化学研究[D]. 中国科学院地球化学研究所. 中国科学院地球化学研究所,1993.
|
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论