低電力マイクロ波トーチ放電による溶液試料の発光分光分析

概要

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A torch-like discharge supported at the mouth of a quartz tube (1.2 mm i.d., 4.2 mm o.d.) is described. Argon was used as a carrier gas at a flow rate of 0.5 l/min. Samples were introduced into the discharge with an ultrasonic nebulizer via a desolvation facility. An addition of 1 mg/ml of potassium chloride to the sample was taken as a standard procedure because of a considerable reduction of background and an enhancement of spectral intensity of metals. In the presence of potassium chloride, the torch extended to a height of 25 mm at a microwave power of ca. 100 W (2450 MHz). The maximum spectral emission for all the metals examined appeared at the same position near the bottom of the torch. This feature is convenient for simultaneous multi-element analysis. Detection limits were measured for silver, cadmium, cobalt, chromium, iron, lead, strontium and zinc, and compared with those obtained in the capillary discharge under the same instrumental conditions. The torch discharge was superior to the capillary discharge for all the elements, especially for cobalt, iron, chromium and strontium.
社団法人日本分析化学会の論文
1976-05-10