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Quantification of Octacalcium Phosphate, Authigenic Apatite and Detrital Apatite in Coastal Sediments Using Differential Dissolution and Standard Addition : Volume 11, Issue 1 (31/01/2014)

By Oxmann, J. F.

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Book Id: WPLBN0004020825
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: Quantification of Octacalcium Phosphate, Authigenic Apatite and Detrital Apatite in Coastal Sediments Using Differential Dissolution and Standard Addition : Volume 11, Issue 1 (31/01/2014)  
Author: Oxmann, J. F.
Volume: Vol. 11, Issue 1
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Schwendenmann, L., & Oxmann, J. F. (2014). Quantification of Octacalcium Phosphate, Authigenic Apatite and Detrital Apatite in Coastal Sediments Using Differential Dissolution and Standard Addition : Volume 11, Issue 1 (31/01/2014). Retrieved from

Description: School of Environment, The University of Auckland, New Zealand. Knowledge of calcium phosphate (Ca-P) solubility is crucial for understanding temporal and spatial variations of phosphorus (P) concentrations in water bodies and sedimentary reservoirs. In-situ relationships between liquid and solid-phase levels cannot be fully explained by dissolved analytes alone and need to be verified by determination of particular sediment P species. Lack of quantification methods for these species limits the knowledge of the P cycle. To address this issue, we (i) optimized a specifically developed conversion-extraction (CONVEX) method for P species quantification using standard additions; and (ii) simultaneously determined solubilities of Ca-P standards by measuring their pH-dependent contents in the sediment matrix. Ca-P minerals including various carbonate fluorapatite (CFAP) specimens from different localities, fluorapatite (FAP), fish bone apatite, synthetic hydroxylapatite (HAP) and octacalcium phosphate (OCP) were characterized by XRD, Raman, FTIR and elemental analysis. Sediment samples were incubated with and without these reference minerals and then sequentially extracted to quantify Ca-P species by their differential dissolution at pH values between 3 and 8. The quantification of solid-phase phosphates at varying pH revealed solubilities in the following order: OCP > HAP > CFAP (4.5% CO3) > CFAP (3.4% CO3) > CFAP (2.2% CO3) > FAP. Thus, CFAP was less soluble in sediment than HAP, and CFAP solubility increased with carbonate content. Unspiked sediment analyses together with standard addition analyses indicated consistent differential dissolution of natural sediment species vs. added reference species and therefore verified the applicability of the CONVEX method in separately determining the most prevalent Ca-P minerals. We found surprisingly high OCP contents in the analyzed coastal sediments which supports the hypothesis of apatite formation by an OCP precursor.

Quantification of octacalcium phosphate, authigenic apatite and detrital apatite in coastal sediments using differential dissolution and standard addition

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