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利用连续化学浸取实验方法，对采自贵州省二叠纪龙潭组的３２ 个煤样中的１０ 种潜在毒害微量元素的化学活动性进行了研究．结果表明：煤中Ｈｇ、Ａｓ、Ｓｅ、Ｃｄ、Ｃｕ、Ｐｂ 等元素具有极强的化学活动性，其中平均８３－８％ 的Ｈｇ 、９３．５％ 的Ａｓ、８０－３ ％ 的Ｓｅ、６３ ．３ ％ 的Ｃｄ、７１ ．１ ％ 的Ｃｕ 和８６－８ ％ 的Ｐｂ 可以被带出煤中而进入表生环境；煤中Ｚｎ 的化学活动性次之，只有平均４６－６ ％ 的Ｚｎ 可能迁移进入环境中；Ｔｌ、Ｃｒ、Ｎｉ 的化学活动性最差，平均可浸取比例分别是２２－９％ 、１９－７ ％ 和２５－７％ ．煤中潜在毒害微量元素的化学活动性取决于其在煤中的赋存状态．存在于硫酸盐、碳酸盐、硫化物和部分有机相中的元素在风化过程中很容易被带出，而存在于硅酸盐矿物相中的元素在表生条件下是非常稳定的．
The chemical activities of 10 potentially toxic trace elements in 32 coal samples collected from Longji Formation of Permian in Guizhou Province were studied by using continuous chemical leaching method. The results show that Hg, As, Se, Cd, Cu, Pb and other elements in coal have extremely high chemical activity, with an average of 83-8% of Hg, 93.5% of As, 80-3% of Se, 63 . 3% of Cd, 71. 1% Cu and 86-8% Pb can be taken out of the coal to enter the superficial environment. The chemical activity of Zn in the coal is second, and only 46-6% of the average Zn can migrate into the environment. Tl, Cr , Ni had the poorest chemical activity with the average leachable ratio of 22-9%, 19-7% and 25-7% respectively. The chemical activity of potentially toxic trace elements in coal depends on its state of occurrence in the coal. The elements present in sulphate, carbonate, sulphide and some organic phases are easily carried out during weathering, while the elements present in the silicate mineral phase are very stable under supercritical conditions.