Fractionation of Inorganic Phosphate in Calcareous Lake Sediments

钙质的 化学 分馏 连二亚硫酸钠 碳酸氢盐 试剂 萃取(化学) 磷酸盐 无机化学 核化学 色谱法 地质学 有机化学 古生物学
作者
J. D. H. Williams,J. K. Syers,R. F. Harris,David E. Armstrong
出处
期刊:Soil Science Society of America Journal [Wiley]
卷期号:35 (2): 250-255 被引量:228
标识
DOI:10.2136/sssaj1971.03615995003500020023x
摘要

Abstract Inorganic orthophosphate (inorganic P) added with NH 4 F reagent to calcareous Wisconsin lake sediments was recovered in the NH 4 F (0–32%), citrate‐dithionite‐bicarbonate (18–23%), and first HCl (38–63%) reagents of an inorganic P fractionation scheme. Calcium fluoride, formed during NH 4 F extraction of calcareous materials, sorbed inorganic P, presumably resulting in the formation of a CaF 2 ‐orthophosphate complex; inorganic P was also sorbed by CaCO 3 and CaF 2 in an NaOH system. Consequently, the values of NH 4 F‐P and first NaOH‐P underestimated the amount of inorganic P released from secondary Al‐ and Fe‐containing sediment components during the NH 4 F and first NaOH extractions, whereas the values for “reductant‐soluble P” (citrate‐dithionite‐bicarbonate‐extractable) overestimated the amount of P occluded within Fe oxides, and the P extracted subsequently by HCl overestimated the amount of acid‐extractable Ca‐P present. Because of the side reactions with CaCO 3 , the NH 4 F reagent was omitted in subsequent fractionation studies. Added inorganic P sorbed from 0.1 N NaOH solution by CaCO 3 in pure form or in calcareous sediments was essentially quantitatively recovered in a subsequent citrate‐bicarbonate extraction. A proposed inorganic P fractionation scheme for calcareous materials, based on successive single extractions with NaOH, citrate‐dithionite‐bicarbonate, and HCl reagents, removed approximately 90% of the total inorganic P in the sediments. Native inorganic P released in the NaOH extraction originated from Fe‐ and Al‐bound P but not from Ca‐bound P, and P released in the subsequent citrate extraction was largely, if not wholly derived from P resorbed during the preceding NaOH extraction. Phosphorus released in the following HCl extraction was derived from Ca‐bound P. Previous inorganic P fractionation schemes have underestimated nonoccluded Fe‐ and Al‐bound P and overestimated Cabound P and, frequently, occluded Fe‐bound P in calcareous soils and sediments.
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