Concentration of As, Pb, Hg, Cd, Se, Cu, Sr, Ba, B and other tr ac e elements have been determinated in channel samples collected at main active mi nes in Weibei, Shaanxi province.

• 对陕西省渭北主要煤田主采煤层中的As、Pb、Hg、Cd、Se、Cu、Sr、Ba、B等微量元素的分析结果表明 :渭北原煤中Hg、Se、As、Pb、B含量明显高于地壳平均值 ,呈富集状态 ;