Phosphorus Speciation in Sequentially Extracted Agro‐Industrial By‐Products: Evidence from X‐ray Absorption Near Edge Structure Spectroscopy

Journal of Environmental Quality - Tập 39 Số 6 - Trang 2179-2184 - 2010
Jens Kruse1, Wakene Negassa2, N. Appathurai3, Lucia Zuin4, Peter Leinweber2
1Univ. of Rostock, Institute for Land Use, Justus-von-Liebig Weg 6, D-18051 Rostock, Germany
2Univ. of Rostock, Institute for Land Use Justus‐von‐Liebig Weg 6 D‐18051 Rostock Germany
3Synchrotron Radiation Center Univ. of Wisconsin–Madison Stoughton WI 53589
4Canadian Light Source Univ. of Saskatchewan Saskatoon SK S7N 0X4 Canada

Tóm tắt

The phosphorus (P) in agro‐industrial by‐products—a potential source of freshwater eutrophication but also a valuable fertilizer—needs to be speciated to evaluate its fate in the environment. We investigated to what extent X‐ray absorption near edge structure (XANES) spectroscopy at the P K‐ and L2,3‐edges reflected differences in sequentially extracted filter cakes from sugarcane (Saccharum officinarum L.) (FIC) and niger seed (Guizotia abyssinica Cass.; NIC) processing industry in Ethiopia. The P fractionation removed more labile (54%) and H2SO4–P (28%) from FIC than from NIC (18% labile, 12% H2SO4–P). For the FIC residues after each extraction step, linear combination (LC) fitting of P K‐edge spectra provided evidence for the enrichment of Ca‐P after the NaOH‐extraction and its almost complete removal after the H2SO4–treatment. The LC‐fitting was unsuccessful for the NIC samples, likely because of the predominance of organic P compounds. The different proportions of Ca‐P compounds between FIC (large) and NIC (small) were more distinctive in L2,3‐ than in the K‐edge XANES spectra. In conclusion, the added value of complementary P K‐ and L2,3‐edge XANES was clearly demonstrated, and the P fractionation and speciation results together justify using FIC and NIC as soil amendments in the tropics.

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Thông tin xuất bản

Journal of Environmental Quality

Tập 39 Số 6

2179-2184

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