Issue 4, 2005

Redistribution reactions of butyl- and phenyltin species during storage in methanol

Abstract

The stability of organotin species, which are frequently used as standards, in methanol has been investigated by gas chromatography coupled to either quartz furnace atomic absorption spectrometry, inductively coupled plasma mass spectrometry or mass spectrometry. Ethylation with sodium tetraethylborate was used during sample preparation. The species composition of single or mixed standard solutions at a concentration of 10 μg g−1 was investigated after storing at −20 °C, +4 °C and +22 °C for various time periods. All butyltin species (monobutyltin—MBT, dibutyltin—DBT and tributyltin—TBT) were found to be stable for all storage conditions, even when mixed. The single triphenyltin (TPhT) standard was also stable, whereas mono-and diphenyltin (MPhT; DPhT) were unstable. MPhT redistributed to DPhT and inorganic tin (IOT), while DPhT redistributed to MPhT and to a minor extent to TPhT. In a mixture containing MBT, DBT, TBT, MPhT, DPhT and TPhT, besides the above mentioned reactions, DPhT was found to react strongly with MBT forming up to 73% monobutyl-monophenyltin (MBMPhT) and MPhT. The composition of MBMPhT was investigated by GC-MS. Suggestions for the type of reactions leading to the redistribution of OT species are outlined and suggestions on how to prepare stable OT standards are made.

Graphical abstract: Redistribution reactions of butyl- and phenyltin species during storage in methanol

Article information

Article type
Paper
Submitted
28 Oct 2004
Accepted
26 Jan 2005
First published
22 Feb 2005

J. Anal. At. Spectrom., 2005,20, 266-272

Redistribution reactions of butyl- and phenyltin species during storage in methanol

D. Nguyen Van, R. Lindberg and W. Frech, J. Anal. At. Spectrom., 2005, 20, 266 DOI: 10.1039/B416570E

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