... in the Pakchongsoil supports the contention that the initial contents of water soluble Cu(II), Pb(II) and Zn(II) were the high-est in the Pakchong soil (Figs. 3 – 5). The pH profiles along the ... Among these foursoils, the Pakchong soil was conspicuous and the pHwas far below 3 in the first through fifth sections. In the Nakajo, Fukuchiyama, and Harumachi soils, on the other hand, the ... seems contradictory that the Pakchong soilcontaining the largest amount of free iron oxide,which can uptake H+ions and anions, exhibited the lowest pH. However, iron oxide in the Pakchong soilwas...