The modes of occurrence of potassium in coals were investigated by sequential extraction procedures with distilled water,1 mol/L ammonium acetate and 1 mol/L hydrochloric acid in turn.

• 通过萃取的方法,分别以水、醋酸铵和稀盐酸为萃取液对钾在我国一些煤中的存在形式进行了研究。