K. Mizuishi et al., TRACE ANALYSIS OF TRIBUTYLTIN AND TRIPHENYLTIN COMPOUNDS IN SEA-WATERBY GAS CHROMATOGRAPHY-NEGATIVE ION CHEMICAL-IONIZATION MASS-SPECTROMETRY, Journal of chromatography, 800(2), 1998, pp. 267-273
Citations number
24
Categorie Soggetti
Chemistry Analytical","Biochemical Research Methods
An analytical gas chromatography-mass spectrometry (GC-MS) method usin
g negative ion chemical ionization (NICI) has been investigated for th
e determination of trace tributyltin (TBT) and triphenyltin (TPhT) com
pounds in sea water. TBT and TFhT were extracted from samples as chlor
ide under;he acidic condition of HCl. Doping of the GC system with a d
ilute HBr-methanolic solution resulted in direct detection of the chlo
rides of TBT, TPhT and tripentyltin (TPenT, internal standard). As the
result of HBr doping, a sharp peal, of the respective organotin bromi
des appeared: during GC analysis, halogen exchange from the chloride t
o the bromide occurred. NICI-MS was highly selective and sensitive for
the detection of TBT, TPhT and TPenT bromides. In the selected ion mo
nitoring mode of NICI-MS, the minimum detectable amounts defined as th
e signal equal to three times the standard deviation (3 sigma) of the
baseline noise were 20 and 25 pg ml(-1) for TBT and TPhT, respectively
. These amounts are approximately 250-400 rimes better than those in e
lectron impact mode. The combination of GC using an apolar capillary c
olumn doped with a dilute HBr-methanolic solution and NICI-MS made it
possible to determine TBT and TPhT at less than the ng l(-1) level in
sea water. (C) 1998 Elsevier Science B.V.