The question of iconicity salt soluble is a difficulty in inorganic chemistry teaching.

Solubility of exchangeable bases in a compost amended soil extracted with 001 M copper chloride;

Under the natural ecological condition of rape field cultivation,effect on rape soil and dissolution in the base ions of K,Na,Ca and Mg with different pH of simulated acid rain was investigated by spraying and soil columns leaching experiments.

Significant correlation between the total amount of four kinds of base ions in the leacheate and concentration of H + of acid rain is evident.

The effects of simulated acid rain on releasing base cations of red soil were studied with leaching experiments.

The results showed that amounts of leaching base cations increased obviously when the pH value of simulated acidic rain was lower than 3.

The releasing characteristics and mechanism of base ions in four types of typical soils(yellow soil,grey-brown purplish soil,red-brown purplish soil,red purplish soil),which were collected from the Three Gorges Reservior Region,are studied by simulated acid rain leaching of soil columns equipment indoor.

Hydrogel_treatment markedly limited the buildup of salt ions(Na~+ and Cl~-) i.