Effects of Potassium Chloride on the Analytical Characteristics of the Capillary Arc Excitation Source

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In emission spectrometry using a capillary arc as an excitation source, the effects of potassium chloride in solutions on the spectrum and background intensities, analytical curves, precision, and sensitivity have been investigated. Sample solutions were sprayed with a pneumatic glass nebulizer, passed through a modified desolvation device, and the desolvated aerosols were introduced into the arc plasma to be excited. The capillary arc operated satisfactorily at a low argon flow rate of 1.15<I>l</I>/min. The spectrum intensity of iron increased and the background emission decreased with increasing potassium chloride concentration. When spraying solutions with more than 0.5 M potassium chloride, potassium chloride deposited on the inside of the capillary, reducing the emission stability. The use of 0.1 M potassium chloride solutions resulted in the improvement in detection limits for all the elements tested but tungsten and zirconium without marked decrease in the slope of analytical curves and reduction in the precision of measurements.
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