Optimum Needle Materials of the Corona Discharge Electrode for Quantitative Analysis by Liquid Chromatography/Atmospheric Pressure Chemical Ionization-Mass Spectrometry

概要

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Fourteen types of corona discharge needles made of different materials were used for high performance liquid chromatography/atmospheric pressure chemical ionizationquadrupole mass spectrometer (LC/APCI-QMS), and after a lapse of one hour and five hours from the start of the equipment, selected-ion monitoring determination of 3,5-di-tert-butyl-4-hydroxytoluene (BHT) was made seven times repeatedly. Suitability as a discharge needle was judged by the total (n=14) relative standard deviation (T-RSD) of the quantitative determination value. T-RSDs of the iron needle, tin-plated iron needle, silver alloy needle, platinum alloy needle and stainless steel needle were 1-3%.It could be elucidated from the scanning electron micrograph of the needle surface that suitability as a discharge needle was related to the stability of needle surface material against the corona discharge. The iron needle, having a small T-RSD was judged to be the most suitable as a corona discharge needle for quantitative analysis.
日本質量分析学会の論文
1995-12-20