Determination of butyltin compounds in aqueous samples by gas chromatography with flame photometric detector and headspace solid-phase microextraction after in-situ hydride derivatization
Gb. Jiang et Jy. Liu, Determination of butyltin compounds in aqueous samples by gas chromatography with flame photometric detector and headspace solid-phase microextraction after in-situ hydride derivatization, ANAL SCI, 16(6), 2000, pp. 585-588
A method for the extraction and determination of butyltin species in aqueou
s samples by solid-phase microextraction (SPME) combined with a capillary g
as chromatography-flame photometric detector (GC-FPD) is described. The but
yltin species was converted to its hydride form by sodium tetrahydroborate
(NaBH4) in a closed headspace vial prior to extraction. A laboratory-assemb
led SPME device including a fused-silica fiber and a modified microsyringe
protection part was used throughout the experiment. The extraction was an e
quilibrium process that depended on the butyltin species partitioning betwe
en the liquid phase and the fiber. When the equilibrium was reached, the fi
ber was directly transferred to a GC column under the protection of a micro
syringe, where the analyte was thermally desorbed inside the heated injecto
r and subsequently, separated in a HP-1 capillary column and detected by a
laboratory-made flame photometric detector using quartz surface-induced tin
emission. The detection limits based on the signal equal to 3 times of the
base-line noise were 0.2 mu g/L, 0.2 mu g/L, 0.1 mu g/L and 0.02 mu g/L fo
r monobutyltin (MBT), dibutyltin (DBT), tributyltin (TBT) and tetrabutyltin
(TeBT), respectively. The recovery ranged from 85% to 117%. The proposed m
ethod has been applied to determination of butyltin species in Various aque
ous samples.