2001/07/01 by G. F. Koopmans, G.F. Koopmans, M. E. van der Zeeuw +4 · 22 citations
Chemistry · Energy · Engineering · Environmental Science · #Adsorption #Ammonium #Ammonium oxalate #Chemistry #Contamination #Desorption #Environmental chemistry #Environmental remediation #Geology #Hydroxide #Inorganic chemistry #Iron oxide chemistry and applications #Leaching (pedology) #Oxalate #Phosphorus #Sink (geography) #Soil and Unsaturated Flow #Soil and Water Nutrient Dynamics #Soil science #Soil water #Sorption
paper · open access · doi:10.1097/00010694-200107000-00005
published in Soil Science 166(7), 475-483 (Lippincott Williams & Wilkins)
openalex publication_date 2001/07/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Leaching of phosphorus (P) can be a serious problem in P-enriched sandy soils. Techniques that decrease the P content of such soils have been proposed as possible remediation methods. In this study, we determined the effect of P removal from two P-rich sandy soils on extractability of soil P in a laboratory experiment. We created soil samples in increasing stages of P depletion by using a sink method, which consists of a dialysis membrane tube filled with hydrous Fe-(hydr)oxide (DMT-HFO). Total amounts of P removed were relatively small compared with the high initial ammonium-oxalate extractable P contents. However, amounts of water and CaCl2 extractable P in the depleted soil samples decreased by 57 to 80%, on average, for both soils. On the other hand, the ammonium-oxalate-based P saturation index decreased by only 11%. Apparently, labile P forms were readily removed, which means that depletion by the DMT-HFO was selective. Our results suggest that remediation methods that remove a small but selective amount of P from soil may cause a significant decrease of the soil potential to release dissolved P. We also used our results to evaluate the suitability of the DMT-HFO to act as an infinite sink for P. For that, the desorption results were described with a simple kinetic Langmuir equation. Errors of kd (desorption constant) and Q0 (amount of P initially adsorbed) were calculated. Although the model fit was good for both soils (r2=0.98*** and 0.99***), errors in Q0 and kd were large. Therefore, the DMT-HFO method could not be used to determine the desorption constants of our soils. Values of kd and Q0 obtained by this method should not be used in modeling studies.