Speciation of phosphorus in phosphorus-enriched agricultural soils using X-ray absorption near-edge structure spectroscopy and chemical fractionation

被引:270
作者
Beauchemin, S
Hesterberg, D
Chou, J
Beauchemin, M
Simard, RR
Sayers, DE
机构
[1] Nat Resources Canada, CANMET, Off 332A, Ottawa, ON K1A 0G1, Canada
[2] N Carolina State Univ, Dept Soil Sci, Raleigh, NC 27695 USA
[3] NIEHS, Res Triangle Pk, NC 27709 USA
[4] Canada Ctr Remote Sensing, Ottawa, ON K1A 0Y7, Canada
[5] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA
关键词
D O I
10.2134/jeq2003.1809
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Knowledge of phosphorus (P) species in P-rich soils is useful for assessing P mobility and potential transfer to ground water and surface waters. Soil P was studied using synchrotron X-ray absorption near-edge structure (XANES) spectroscopy (a nondestructive chemical-speciation technique) and sequential chemical fractionation. The objective was to determine the chemical speciation of P in long-term-fertilized, P-rich soils differing in pH, clay, and organic matter contents. Samples of three slightly acidic (pH 5.5-6.2) and two slightly alkaline (pH 7.4-7.6) soils were collected from A or B horizons in two distinct agrosystems in the province of Quebec, Canada. The soils contained between 800 and 2100 mg total P kg(-1). Distinct XANES features for Ca-phosphate mineral standards and for standards of adsorbed phosphate made it possible to differentiate these forms of P in the soil samples. The XANES results indicated that phosphate adsorbed on Fe- or Al-oxide minerals was present in all soils, with a higher proportion in acidic than in slightly alkaline samples. Calcium phosphate also occurred in all soils, regardless of pH. In agreement with chemical fractionation results, XANES data showed that Ca-phosphates were the dominant P forms in one acidic (pH 5.5) and in the two slightly alkaline (pH 7.4-7.6) soil samples. X-ray absorption near-edge structure spectroscopy directly identified certain forms of soil P, while chemical fractionation provided indirect supporting data and gave insights on additional forms of P such as organic pools that were not accounted for by the XANES analyses.
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页码:1809 / 1819
页数:11
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