On-line microcolumn preconcentration with desolvation and determination of trace elements by flow-injection inductively coupled plasma atomic emission spectrometry

✍ Scribed by Xuejun Peng; Zucheng Jiang; Yun'e Zen

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 512 KB
• Volume: 283
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)85302-z

✦ Synopsis

A desolvation device was connected to a microcolumn (40 mm X 3.0 mm i.d.) in which 8-hydroxyquinoline-5sulphonic acid was immobilized on the substrate of active carbon-silica gel. The analyte and 1.0 M sodium acetate-acetic acid buffer solution (pH 5.6) were mined and pumped through the microcolumn. The analyte was then preconcentrated and eluted from the column with 2.0 M hydrochloric acid. The efficiency of desolvation, improvement in sensitivity and signal stability over the temperature range 70-12O"C were studied in detail. It was found that ahrminium, copper, cadmium, iron and manganese could be separated from various co-existing elements with a sample volume of 1.2 ml and a carrier flow-rate of 1.2 ml min-'. The desolvation efficiency at a desolvation temperature of 120°C was 73%. The column could be used more than 100 times. The detection limits for the above metal ions were 0.34-5.1 ng ml-' and the relative standard deviations (n = 6) were 2.6-4.3%. The reliability of the method was confhmed for the analysis of human serum, and the results were in good agreement with those given by graphite furnace atomic absorption spectrometry.