Radiofrequency atomization and excitation with a hot graphite cup electrode for trace element determination by atomic emission spectrometry

摘要: A discharge lamp was constructed as an excitation source for the determination of trace elements in small samples by atomic emission spectrometry. graphite cup, which aliquot (10 mg) sample solution or powder loaded, located a stainless-steel cylinder. An r.f. formed between cup and grounded cylinder under reduced pressure argon. Concurrently with formation plasma, heated to about 1900 °C owing power dissipation. As result, thermally vaporized and/or atomized, subsequently excited emit radiation plasma surrounding cup. Basic characteristics were studied conjunction analytical performance. The matrix effect sodium tested found be negligible copper presence up 1000-fold excess sodium. linear dynamic range calibration graph obtained over four orders magnitude analyte mass. applied direct copper, zinc chlorine National Institute Standards Technology Standard Reference Materials biological samples.