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Determination of anatoxin-a in environmental water samples by solid-phase microextraction and gas chromatography-mass spectrometry

✍ Scribed by Vania Rodríguez; Mauricio Yonamine; Ernani Pinto

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
499 KB
Volume
29
Category
Article
ISSN
1615-9306

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✦ Synopsis

Abstract

In the present work, a method was developed and optimized aiming at the determination of anatoxin‐a in environmental water samples. The method is based on the direct derivatization of the analyte by adding hexylchloroformate in the alkalinized sample (pH = 9.0). The derivatized anatoxin‐a was extracted by a solid‐phase microextraction (SPME) procedure, submersing a PDMS fiber in an amber vial for 20 min under magnetic stirring. GC‐MS was used to identify and quantify the analyte in the SIM mode. Norcocaine was used as internal standard. The following ions were chosen for SIM analyses (quantification ions in italics): anatoxin‐a: 191, 164, 293 and norcocaine: 195, 136, 168. The calibration curve showed linearity in the range of 2.5–200 ng/mL and the LOD was 2 ng/mL. This method of SPME and GC‐MS analysis can be readily utilized to monitor anatoxin‐a for water quality control.

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