Abstract
The negative ions observed by plasma chromatography (PIC) and atmospheric pressure ionization mass spectrometry (APIMS) were compared for maleic acid, fumaric acid, and the isomeric phtalic acids. Although the product ionic species observed by PIC and APIMS are expected to the same, based on similar ionization mechanisms and conditions, there are some exceptions. All three isomers of phthalic acid show the identical ionic species of (M — 18) − and (M + O) − in APIMS, while phthalic aci and isophthalic acid show a single ionic species with different ion mobilities in PIC. Maleic acid and fumaric acid display the same patterns of negative product ions in either PIC or APIMS. It may be concluded that if the ion survival time τ of product ion from a compound is longer than the time of PIC detection, ieτ⩾ 10 −2 sec, then the ion can be observed by both techniques; if τ ⩾ 10 −5 sec then the ion can be observed only by APIMS.
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