引用本文:
洪秀萍, 梁汉东, 张玉法, 徐德明. 云贵川交界区晚二叠世煤系地层出露风化土的酸性特征[J]. 环境化学, 2017, 36(8): 1831-1841
HONG Xiuping, LIANG Handong, ZHANG Yufa, XU Deming. Acidity characteristic of efflorescent clay in late Permian coal-bearing strata in border area of Yunnan, Guizhou and Sichuan[J]. Environmental Chemistry, 2017, 36(8): 1831-1841

云贵川交界区晚二叠世煤系地层出露风化土的酸性特征
洪秀萍1,2, 梁汉东1,2, 张玉法3, 徐德明3
1. 中国矿业大学(北京), 煤炭资源与安全开采国家重点实验室, 北京, 100083;
2. 中国矿业大学(北京), 地球科学与 测绘工程学院, 北京, 100083;
3. 四川省煤田地质工程勘察设计研究院, 成都, 610072
摘要:
云贵川交界区农村流行地氟病且曾以"土"拌煤作为生活燃料的现象普遍,煤系地层广泛出露且前人观察指出当地拌煤"土"常取自煤系地层风化土.本文以采自该区7个县域的71件煤系地层出露风化土为样本进行研究,结果表明,52%的风化土呈酸性,pH均值为4.62(2.39-5.54,n=37);硫酸根含量显著偏高,均值达到1778 μg·g-1(295-13086 μg·g-1n=71);氟含量总体偏高,均值达到751 μg·g-1(237-1764 μg·g-1n=71).酸性风化土的pH与其硫酸根含量的负对数-lgC[SO42-]成正相关(r=0.75),表明风化土中酸的存在形式可能为酸性硫酸盐如KHSO4 或 NaHSO4, 而后者可能源自煤系地层中黄铁矿的风化.在一定条件下(燃烧),风化土内部的酸与氟在燃烧条件下的相互作用可能导致氟化氢释放,且风化土中氟与高硫煤在燃烧条件下相互作用可能加剧氟化氢释放.
关键词:    风化土    酸度    氟化氢    地氟病    云贵川交界区   
Acidity characteristic of efflorescent clay in late Permian coal-bearing strata in border area of Yunnan, Guizhou and Sichuan
HONG Xiuping1,2, LIANG Handong1,2, ZHANG Yufa3, XU Deming3
1. State Key Laboratory of Coal Resources and Safety Mining, Beijing, 100083, China;
2. College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing, 100083, China;
3. Sichuan Institute of Coal Field GeologicalEngineering Exploration and Designing, Chengdu, 610072, China
Abstract:
It is an universal phenomenon that clay is used for coal-burning in fluorosis areas in the border of Yunnan, Guizhou and Sichuan, where coal-bearing strata is widely outcropped, and clay for coal-burning is usually considered to be collected from efflorescent clay in coal-bearing strata by some scholars. About 71 samples of efflorescent clay of coal-bearing strata were collected from seven counties in this area and the results confirms that 52% of efflorescent clay was acidic, and the average pH was 4.62 (2.39-5.54,n=37); the content of sulfate was very high, with an average of 1778 μg·g-1(295-13068 μg·g-1,n=71); The fluorine content of efflorescent clay was high as a whole, with an average of 751 μg·g-1 (237-1764 μg·g-1, n=71). The pH value of the efflorescent clay was positively correlated with the -lgC[SO42-](r=0.75), which indicated that the acid may exist in the form of acidic sulfate such as KHSO4 or NaHSO4. Under certain conditions(combustion), the interaction between fluorine and acidity in the efflorescent clay may result in the release of hydrogen fluoride under combustion, and the interaction between fluorine and high sulfur coal may intensify the release of hydrogen fluoride in clay under combustion.
Key words:    efflorescentclay    acidity    hydrogen fluoride    endemic fluorosis    the border area of Yunnan    Guizhou and Sichuan   
收稿日期: 2016-11-26
基金项目: 国家自然科学基金(41371449)资助.
梁汉东,E-mail:HDL6688@vip.sina.com
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