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Chromatographic behavior of pyrithiones
Caren Anja Doose1, Maciej Szaleniec, Peter Behrend
1Center for Environmental Research and Environmental Technology, Department for Bioorganic Chemistry, University of Bremen, Bremen, Germany. c.doose@iu-bremen.de
Journal of Chromatography. A
|November 6, 2004
Summary
Pyrithione biocides show promise as replacements for tributyltin antifoulants. However, their chromatographic analysis is complicated by transformations into metal complexes and oxidation products, impacting environmental monitoring.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Marine Biology
Background:
- Pyrithione biocides are emerging as alternatives to tributyltin antifoulants in marine coatings.
- Understanding the behavior of pyrithione species is crucial for environmental risk assessment and regulatory compliance.
Purpose of the Study:
- To investigate the chromatographic behavior of pyrithione (PT) and its related compounds.
- To identify potential transformations of pyrithione species during analytical procedures.
- To assess the impact of these transformations on the accurate speciation and environmental analysis of pyrithiones.
Main Methods:
- UV-vis spectroscopy
- Electrospray ionization mass spectrometry (ESI-MSn)
- High-performance liquid chromatography with diode array detection (HPLC-DAD)
- High-performance liquid chromatography coupled with electrospray ionization mass spectrometry (HPLC-ESI-MSnD)
Main Results:
- Pyrithione (PT) undergoes transformations into copper or iron complexes and its oxidation product, bis(2-pyridinyl)disulfide 1,1'-dioxide (PT2).
- The observed transformations are dependent on the stationary phase utilized in chromatographic analysis.
- Direct chromatographic analysis of zinc [Zn(PT)2] and iron [Fe(PT)3] pyrithione complexes is complicated by their speciation.
Conclusions:
- Analytical methods for pyrithione speciation require careful development to account for analyte transformations.
- The observed chemical changes during chromatography can lead to inaccurate quantification and identification of pyrithione species in environmental samples.
- Further research is needed to develop robust analytical techniques for reliable environmental monitoring of pyrithione biocides.