Fig. 1From: Wien effect of Cd/Zn on soil clay fraction and their interactionNegative and positive charge densities of clay fractions (< 2 μm) of the studied soils (a) paddy soil (Inceptisols) and boggy soil (Histosols) (b) yellow drab soil (Ustalfs) and yellow brown soil (Haplic Luvisols) as a function of pHBack to article page