JPS5740651A - Soil percolating method - Google Patents

Abstract

PURPOSE:To percolate soil during a short period with a simple device structure without requiring heating, by a method wherein after a percolating reagent solution and sample soil are contacted left at rest within a vessel with a particular specification and with a constant rate during constant time, with a stopcock opened thereby the solution is flowed out. CONSTITUTION:With a stopcock 3 of a percolating tube 1 closed, an 1N ammonium acetate aqueous solution with pH7 of a constant volume is entered said tube 1, and then a prescribed amount of sample soil 5 is thrown into it. Further, after contacting them at rest for constant time positive ions in the soil are substituted for NH4<+> ions, with the stopcock 3 opened, the aqueous solution is washed away in a receiver. Then, with a 80% methanol aqueous solution with pH7 of prescribed amount excess ammonium acetate in the soil is washed away. Further, with the stop cock 3 closed, 1NKCl aqueous solution with pH7 of a prescribed amount is added in the percolating tube 1, and NH4<+> ions are, after contacted with the soil at rest for constant time, substituted for K<+> ions. Then, with the stopcock opened, the solution is flowed out into a new receiver 4. Next, by a steam distillation method and others, NH4<+> ions are determined and then the amount of base substitution in the sample soil is calculated.