Improved methods of soil acidification

摘要

PPROBLEM TO BE SOLVED: To reduce the eluation volume of cationic heavy metals contained in acidified soil at a low cost and effectively. PSOLUTION: The sodium ion of zeolite is subjected to an ionic exchange with a calcium ion alone or at least, a kind of the group consisting of an iron ion, a hydrogen ion, a magnesium ion and a potassium ion, and a calcium ion. Further, after the ionic exchange, a soil conditioner whose ratio of the total volume of an exchangeable cation to the exchange volume of the cation is not less than 0.7, is used. The dosage of the soil conditioner is not less than 0.666 g to not more than 78 g per liter of soil. PCOPYRIGHT: (C)2009,JPO&INPIT