We studied the sorption reactions of zinc (Zn) with freshly prepared hydrous iron oxide gels modified to provide phosphorus/iron (P/Fe) ratios of 0, 0.05, 0.10, 0.20, and 0.40. Hydrous oxides have a high adsorptive capacity for Zn in acid soils and soils affected by submergence. Zinc concentrations from 0 to 10 mg/L were used to evaluate sorption phenomena where P and Zn interact to affect Zn solution concentration. Sorbed P tends to lower the ZPC of the oxides and increases the net negative charge on its surfaces. The pH of the media affects solution Zn-P-Fe relationships, because the surface charge on the oxide is pH-dependent. This study concludes that hydrous iron oxides may play an important role in the sorption of Zn in soils and possibly affect its availability to crops.
No takes yet. Share an insight, caveat, or question.
GHANEM et al. (1988) studied this question.