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Abstract
Amorphous calcium phosphate (ACP) possesses an ultrahigh specific surface area and, thus, has great potentials for the use as adsorbent material. We herein demonstrated the use of ACP as a novel solid-phase extraction adsorbent for selective adsorption of oxalic acid, so as to eliminate the interference from nitrate on oxalic acid in reversed phase high performance liquid chromatography (RP-HPLC). And the adsorbed oxalic acid could be eluted with diammonium phosphate. The optimum experimental conditions for the separation and determination of oxalic acid were studied. After the interference was eliminated, oxalic acid was determined by RP-HPLC at the optimum chromatographic conditions with an average recovery ranging between 96.1% and 102.4%, and the relative standard deviations were less than 3.0%. The main advantage of ACP adsorbent was that it affords high adsorption capacity and selectivity for oxalic acid over a wide range of pH values. The proposed method was successfully applied to the analysis of oxalic acid in xylem saps of Indian mustard.