Abstract
Calibration curves for copper determination were compared using several copper emission lines, when various dissolution acids were employed for sample preparation in inductively coupled plasma-optical emission spectrometry with a conventional and a hydrofluoric acid-proof torch. The conventional torch was composed of a plasma torch with a central tube made of quartz, a concentric-type nebulizer made of quartz and a cyclone-type spray chamber made of glass. On the other hand the hydrofluoric acid-proof torch was composed of a plasma torch with a central tube made of sapphire, a cross flow-type nebulizer made of platinum and a single-pass Scott-type spray chamber made of polytetrafluoroethylene. When sample solutions including nitric acid or a mixture of nitric acid and hydrofluoric acid were introduced to the ICP plasma through the hydrofluoric acid-proof torch, the emission intensities of the copper lines were observed with small fluctuations, leading to a more precise determination of copper. On the other hand, when sample solutions including sulfuric acid or tartaric acid were introduced into the ICP plasma, the emission intensities became smaller with poor analytical precision, independent of the kind of copper lines employed. The reason for this would be a physical interference caused by variations in the physical properties of each acid solution.
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