Extraction of butyltin species and their gas chromatographic determination as chlorides in a sediment certified reference material for trace metals, PACS-1

Document Type

Article

Publication Date

1989

Publication Title

Journal of Chromatography A

Volume

475

Issue

2

First Page

373

Last Page

379

Abstract

A gas chromatographic method has been developed for the determination of butyltin species in sediments. The butyltin species are separated as chlorides by using a DB-608 open tubular column after their extraction from the sediment using a combination of sonication in methanolic HCl and solvent extraction. Two extractants are possible: toluene-isobutyl acetate-tropolone and hexane-isobutyl acetate. The efficiencies for the first extractant are: tributyltin, 94.4 ± 4.7%; dibutyltin, 94.9 ± 2.2%; and monobutyltin, 86.3 ± 4.2%. The absolute detection limits are about 30 pg tin. Using a 1-g sample, the relative detection limits are about 30 ng tin per g sediment. These may be lowered to 3 ng tin per g by starting with a 4-g sample and adding a concentration step. The reference material PACS-1 was found to contain 1.08 ± 0.31 μg tin per g of tributyltin and 1.13 ± 0.30 μg tin per g of dibutyltin. © 1989.

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