Determination of copper content in polyolefin resin by microwave plasma torch atomic emission spectrometry through sensitivity enhancement with surfactant
ZHANG Qi-kai, JIAO Jin-qing
Technology Organization, 81, Mihogaoka, Ibaraki, Osaka 567 0047, Japan; 3. Department of Grafic Art Technology and Applied Photochemistry, Faculty of Chemical and Food
Abstract:A new method was studied of the microwave plasma torch atomic emission spectrometry (MPT-AES) with surfactant sensitization for the determination of copper content in polyolefin resins. The effect of the working conditions of the instrument,acid effect and the co-existing elements on copper determination was investigated in detail. The experimental results showed that the surface active agent (CTMAB) has the obvious sensitization effect on the determination of copper. The detection limit of this reaction was found to be decreased from 7.6 ng/mL to 3.1ng/mL, the allowance of V, Na, Mn, Fe, Ti and other ions was increased from 1 times to 5 times above. By ashing samples of polyolefin, the relative standard deviations were 3.0 % and 1.9 %in determination of copper in polyethylene and polypropylene by working curve method, and the recoveries were in the range of 98 % to 103 % and 99 % to 102 %.
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