Speciation analysis of organotin in the River Scheldt by capillary gas chromatography atomic emission spectrometry (GC-AES).
Résumé
Two rapid, sensitive and interference-free anal. procedures were developed for the comprehensive speciation anal. of ionic Bu- and phenyltin compds. in water. One of them based on ethylation of ionic organotin in the aq. phase with Na tetraethylborate (NaBEt4) followed by the extn. of the derivatized species into hexane. The other method involved preconcn. of ionic organotin on a C18 cartridge followed by on-column ethylation in a semi-automated flow system. Sepn. and detn. of organotin species were performed by capillary GC-AES. A sample vol. of 20-50 mL was sufficient for the anal. and a detection limit of 0.1 ng/L (as Sn). The methods were applied to the detn. of organotin in the River Scheldt at 15 locations close to the Antwerp agglomeration. Butyltin compds. were detected in all the samples at concns. 10-140, 8-70, and 4-10 ng/L for the mono-, di-, and tributyltin in the dissolved phase, resp. No phenyltin species were detected. The agreement between the results from different methods was within 15%. [on SciFinder(R)]