Is your GC/MS prepared for the unexpected?
Figure 1. EI (top) and NICI (bottom) total ion chromatograms from the fish extract demon strate the lower background interference and greater sensitivity with negative ion chemical ionization.
Figure 2. EI (top) and NICI (bottom) chromatograms from scan 1200 to 1360 are compared. The component at 1263 in the EI chromatogram is a phthalate ester.The com ponent at 1290 in the NICI chromatogram is mlrex (C10CI12).
Figure 3. Mass chromatograms of πι/ζ 404 (top) and τη/ζ 439 (middle), the most intense peaks of the (M-4C1)" and (M-3C1)' isotopic clusters in mirex's mass spectrum, are shown. At the bottom is the NICI total ion chromatogram from scan 1200 to 1360.
Perhaps you depend on your GC/MS for meeting regulatory protocols. Maybe you need it for quality control or general analysis.The fact is, tough analytical problems are a way of life in the mass spec lab. And you never know what's in store for tomorrow. One of our customers asked for assistance in identifying halogenated organic contaminants in a fish extract. We used the Finnigan MAT INCOS™ 50 equipped with both electron ioniza tion (EI) and negative ion chemical ionization (NICI).The results are shown in the figures here.
The negative ion chromatogram revealed a startling component: mirex, an insecticide and fire retardant.The presence of mirex was confirmed both by comparison with a standard's re tention time and NICI mass spectrum. NICI's greater sensitivity for good electron capture molecules such as mirex provided the answer that EI alone could not deliver. The INCOS 50. The only GC/MS within its price range to offer the full repertoire of ionization techniques for your most challenging samples. Read our Applications Report,"Evalua-
tion of Different Ionization and Inlet Techniques on the INCOS 50."Ask for a demonstration. And never miss an important component again.
FMAT
Finnigan
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