CƠ SỞ KHOA HỌC TÍNH HỆ SỐ K ĐỂ XÁC ĐỊNH KHẢ NĂNG TRAO ĐỔI CATION (CEC) TRONG SÉT

Nguyễn Khang, Tô Cẩm tú, Lê Nhị Thuỷ (trang 111-115)

Từ khoá: hệ số K, trao đổi cation, cation, CEC, sét

Summary

Scientific basis for calculating K coefficient in order to define cation exchange capacity (CEC) in clay

FAO-UNESCO suggested formula calculating CEC: CEC (clay) =CEC (soil)/CEC (clay) x 100 – 3,5%C.

We have suggested 2 methods calculating CEC (clay) in Vietnam condition. Offer to use one of two formulas calculating CEC (by theorical method or by defining K coefficient in the table) in Vietnam condition.