Determination of butyltins in environmental samples using sodium tetraethylborate derivatisation: characterisation and minimisation of interferences

Bowles, KC; Tiltman, MD; Apte, SC; Hales, LT; Kalman, JR

Determination of butyltins in environmental samples using sodium tetraethylborate derivatisation: characterisation and minimisation of interferences

Bowles, KC Tiltman, MD Apte, SC Hales, LT Kalman, JR

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Publisher:: Elsevier Science Bv
Publication Type:: Journal Article
Citation:: Analytica Chimica Acta, 2004, 509 (2), pp. 127 - 135
Issue Date:: 2004-01

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Field	Value	Language
dc.contributor.author	Bowles, KC	en_US
dc.contributor.author	Tiltman, MD	en_US
dc.contributor.author	Apte, SC	en_US
dc.contributor.author	Hales, LT	en_US
dc.contributor.author	Kalman, JR	en_US
dc.date.issued	2004-01	en_US
dc.identifier.citation	Analytica Chimica Acta, 2004, 509 (2), pp. 127 - 135	en_US
dc.identifier.issn	0003-2670	en_US
dc.identifier.uri	http://hdl.handle.net/10453/551
dc.description.abstract	Interferences affecting the determination of butyltin species by sodium tetraethylborate (STEB) derivatisation followed by purgetrap preconcentration were systematically studied using synthetic solutions, natural water samples and sediment extracts. Substances that did not cause interferences included most common cations (apart from those metal ions listed below), anions, metalloids and polar organic compounds. Natural organic matter (NOM) specifically interfered with tributyltin (TBT) due to a mechanism involving partitioning of the butyltin to the hydrophobic portions of the NOM. The metal ions Ag(I) (?2 ?M), Cd(II) (?2 ?M), Cu(II) (?0.5 ?M) interfered predominantly with the determination of monobutyltin (MBT) due to catalytic degradation of the STEB reagent. Pb(II) (?14 ?M) interfered with butyltin determination by an unknown mechanism. Other interferences to the purgetrap method were shown to occur in the presence of chelating agents (e.g. EDTA) or hydrophobic liquids such as diesel fuel. A mixture comprising methanol (MeOH), EDTA and Mn(II) was used to partially mask the effect of interfering NOM and metals. Spike recoveries (mean±S.D. of n=7 different samples) of MBT, dibutyltin (DBT) and TBT in contaminated natural water samples were improved from 70±36,90±11 and 91±24 to 102±10,98±3 and 98±4%, respectively. Spike recoveries (mean±S.D. of n=5 different samples) of MBT, DBT and TBT in aliquots of sediment extracts were improved from 86±17,79±18 and 59±32 to 97±6.2,103±3.6 and 103±5.0%, respectively. The ability to analyse larger aliquots of sediment extracts in the presence of the masking mixture improved the detection limit four-fold if MBT and DBT determination was required and 10-fold if only TBT determination was required.	en_US
dc.publisher	Elsevier Science Bv	en_US
dc.relation.ispartof	Analytica Chimica Acta	en_US
dc.relation.isbasedon	10.1016/j.aca.2003.12.038	en_US
dc.subject.classification	Analytical Chemistry	en_US
dc.title	Determination of butyltins in environmental samples using sodium tetraethylborate derivatisation: characterisation and minimisation of interferences	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	509	en_US
utslib.for	0301 Analytical Chemistry	en_US
utslib.for	0399 Other Chemical Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access
pubs.consider-herdc	true	en_US
pubs.issue	2	en_US
pubs.volume	509	en_US

Abstract:

Interferences affecting the determination of butyltin species by sodium tetraethylborate (STEB) derivatisation followed by purgetrap preconcentration were systematically studied using synthetic solutions, natural water samples and sediment extracts. Substances that did not cause interferences included most common cations (apart from those metal ions listed below), anions, metalloids and polar organic compounds. Natural organic matter (NOM) specifically interfered with tributyltin (TBT) due to a mechanism involving partitioning of the butyltin to the hydrophobic portions of the NOM. The metal ions Ag(I) (?2 ?M), Cd(II) (?2 ?M), Cu(II) (?0.5 ?M) interfered predominantly with the determination of monobutyltin (MBT) due to catalytic degradation of the STEB reagent. Pb(II) (?14 ?M) interfered with butyltin determination by an unknown mechanism. Other interferences to the purgetrap method were shown to occur in the presence of chelating agents (e.g. EDTA) or hydrophobic liquids such as diesel fuel. A mixture comprising methanol (MeOH), EDTA and Mn(II) was used to partially mask the effect of interfering NOM and metals. Spike recoveries (mean±S.D. of n=7 different samples) of MBT, dibutyltin (DBT) and TBT in contaminated natural water samples were improved from 70±36,90±11 and 91±24 to 102±10,98±3 and 98±4%, respectively. Spike recoveries (mean±S.D. of n=5 different samples) of MBT, DBT and TBT in aliquots of sediment extracts were improved from 86±17,79±18 and 59±32 to 97±6.2,103±3.6 and 103±5.0%, respectively. The ability to analyse larger aliquots of sediment extracts in the presence of the masking mixture improved the detection limit four-fold if MBT and DBT determination was required and 10-fold if only TBT determination was required.

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