Abstract
The petroleum tracers nitrate and thiocyanate in subterranean waters were determined by capillary ion electrophoresis using direct UV detection. The high concentrations of salts in subterranean waters made the determination difficult. Taking sodium chloride to represent salts in subterranean waters, the effect of high concentrations of salts in samples on the determination was examined. Because of electrostacking and its inverse process, different concentrations of salts in samples could cause different peak heights and peak widths of constant concentration of an anion, but the peak area remained constant. The experimental results showed that the determination of the tracers was feasible using peak areas. By using 100 m M sodium chloride with 2.0 m M: cetyltrimethylammonium chloride as carrier electrolyte solution, determination of nitrate and thiocyanate was accomplished at concentrations of sodium chloride in the sample from 0 to 200 m M. Standard addition recoveries of the tracers in four subterranean water samples were between 91 and 113%.
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