Collisional activation mass spectra of M-. ions of azo dyes containing 2-naphthol.
Collisionally activated decomposition mass spectra of M-. ions of azo dyes are presented. The compounds are of general structure Ar(1)--N = N--Ar(2), where Ar(1) is substituted phenyl and Ar(2) is 2-naphthol. Characteristic fragment ions observed include m/z 157, which corresponds to the 2-naphthol substituent with cleavage of the--N = N--bond represented as [Ar(2)--N]-.. Ion of general structure [Ar(1)--NH]- are also observed. Parent ion scans of m/z 157 provide a potential screening technique for 2-naphthol-containing axo dyes. Specific results are reported for the chloroform extract of FD&C Red #8, and capillary gas chromatographic introduction is compared with direct exposure probe introduction for the identification of dyes.
US Environmental Protection Agency, Environmental Monitoring Systems Laboratory, Las Vegas, Nevada 89193.
W C
WC
Brumley
G M
GM
Brilis
R J
RJ
Calvey
J A
JA
Sphon
D001391:Azo Compounds / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D013058:Mass Spectrometry; D009284:Naphthols / Q000032:analysis*; D012997:Solvents
D001391:Azo Compounds; D009284:Naphthols; D012997:Solvents; C024336:1-phenylazo-2-naphthol; C028405:2-naphthol