✍ Scribed by Stéphanie Reader; Emilien Pelletier
No coin nor oath required. For personal study only.
Capillary column gas chromatography wth ion-trap detection (ITD) was used m the ldenttication and detemunation of mono-, ch-and tributyltm compounds extracted from natural sea water with dlchloromethane and tropolone (0 2%, w/v) Butyltms were treated with hexylmagnesmm bromide to form volatile butylhexyltm denvatlves Standard test solutions contammg tnpropyltm (used as internal standard), tnbutyltm, dlbutyltm and monobutyltm were denvatlzed and used to deternune the response of the Ion-trap detector to these analytes The ion-trap detector, operating m the total Ion morutormg mode (electron nnpact), pmded a detectIon hnut of 5 ng I-' Hnth a sIgnal-to-nose ratlo of 3 for tnbutyltm m sea water ITD mass spectra of tnbutylhexyltm were characterized by the presence of numerous [M -R + l]+, [M -R + 2]+ and [M -R + 3]+ ions m most ion clusters The presence of these hydnde ions IS usual m mass spectrometry of tin compounds and IS attnbuted to a fragmentation property of alkyltms A fragmentation pattern of tnbutylhexyltm mvolvmg stepwlse alkene ehmmatlons, formation of hydnde ions and also molecular hydrogen ehmmation IS discussed The spacechargmg effect previously reported for polycychc aromatic hydrocarbons was also observed for organotm compounds at inJected amounts above 50 ng
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