Comparison of the defluoridation efficiency of calcium phosphate and chitin in the exoskeleton of Antarctic krill

WANG Zhangmin; YIN Xuebin

doi:10.3724/SP.J.1085.2012.00149

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RESEARCH-ARTICLE

Comparison of the defluoridation efficiency of calcium phosphate and chitin in the exoskeleton of Antarctic krill

WANG Zhangmin1, 2, YIN Xuebin Correspondence author

, 1, 2

Correspondence: xbyin@ustc.edu.cn ORCID:

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Vol. 23, Issue 3, pp. 149-154 (2012) • DOI

First published at: Jan 25, 2012

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Abstract

Calcium (Ca), phosphorus (P), and chitin are the main components of the exoskeleton of krill. Defluoridation of a solution of sodium fluoride (NaF) using calcium phosphate (Ca₃(PO₄)₂) and chitin as defluoridation agents was studied. Orthogonal experiments were designed to find the optimum reaction conditions for defluoridation, to obtain the maximum defluoridation efficiency and fluoride removal capacity of calcium phosphate and chitin. At the same time, a comparison of the capacity of the two defluoridation agents was made. The results suggest that calcium phosphate has a far greater capability than chitin for the removal of fluoride (F) from water under similar reaction conditions. It is also suggested that Antarctic krill is likely to adsorb fluoride via compounds such as calcium phosphate, hydroxyapatite, and other compounds of Ca and P with the general form (Ca, X)_x(PO₄, HPO₄, Y)_y(OH, Z)_z, in addition to chitin.

Keywords

calcium phosphate; chitin; defluoridation; krill; orthogonal design

Author Address:

1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;
2. Advanced Lab for Eco-safety and Human health, Suzhou Institute of USTC, Suzhou 215123, China

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