Separation and quantification for various phosphorus oxoacids by isotachophoresis.

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The analytical procedure for the separation and quantification of various phosphorus oxoacids was investigated by the capillary type isotachophoresis. The various phosphorus oxoacids, such as linear-, cyclic-, and lower phosphorus oxoacids, were separated at pH 5.5 with a 0.01 mol dm−3 hydrochloric acid–histidine–0.1% triton X-100 mixture as the leading electrolyte and a 0.01 mol dm−3 hexanoic acid as the terminating electrolyte. The PU value increased in the order of P3m<P4m<P3<P2<\overset1P<\overset3P<P1. The calibration curves for the various phosphorus oxoacids were linear in the range of 0.5–3.5 μg as phosphorus oxoacids. Coefficients of variation for the measured phosphorus oxoacids were less than 2% except for P3. Separation times were approximately 15 min. This procedure was applied to the ground phoshates.
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