Phosphorus Speciation of Sequential Extracts of Organic Amendments Using Nuclear Magnetic Resonance and X‐ray Absorption Near‐Edge Structure Spectroscopies

Journal of Environmental Quality - Tập 36 Số 6 - Trang 1563-1576 - 2007
Babasola Ajiboye1, O. O. Akinremi1, Yongfeng Hu2, Donald N. Flaten1
1Dep. of Soil Science Univ. of Manitoba Ellis Building, 13 Freedman Crescent Winnipeg MB Canada R3T 2N2
2Canadian Light Source Inc., Univ. of Saskatchewan 101 Perimeter Rd. Saskatoon SK Canada S7N 0X4

Tóm tắt

AbstractThe chemical forms of phosphorus in organic amendments are essential variables for proper management of these amendments for agro‐environmental purposes. This study was performed to elucidate the forms of phosphorus in various organic amendments using state‐of‐the‐art spectroscopic techniques. Anaerobically digested biosolids (BIO), hog (HOG), dairy (DAIRY), beef (BEEF), and poultry (POULTRY) manures were subjected to sequential extraction. The extracts and residues after extraction were analyzed by solution 31P nuclear magnetic resonance (NMR) and synchrotron‐based P 1s X‐ray absorption near‐edge structure (XANES) spectroscopies, respectively. Most of the total P analyzed by inductively coupled plasma– optical emission spectroscopy in the sequential extracts of organic amendments was orthophosphate, except POULTRY, which was dominated by organic P. The labile P fraction in all the organic amendments, excluding POULTRY, was mainly orthophosphate from readily soluble calcium and some aluminum phosphates. In the poultry litter, Ca phytate was the main P species controlling P solubility. The recalcitrant fraction of BIO was mainly associated with Al and Fe. Those of HOG, DAIRY, and POULTRY were calcium phytate, which were identified only as organic species in the XANES spectra. The combination of the three techniques—sequential chemical extraction, solution 31P NMR spectroscopy, and P 1s XANES—provided molecular characterization of P in organic amendments that would not have been possible with just one or a combination of any two of these techniques. Therefore, P speciation of organic amendments should use solid‐phase and aqueous speciation techniques as deemed feasible.

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Thông tin xuất bản

Journal of Environmental Quality

Tập 36 Số 6

1563-1576

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