Some methods of measuring the concentrations of free heavy metal ions were compared, and a new method, Donnan Membrane Technique (DMT), was established.

• 摘要对比了最近几十年来国内外土壤溶液中游离重金属离子浓度的测定方法，在此基础上建立了一种新的测量方法-唐南膜平衡法(DMT)。