✦ LIBER ✦

Capillary electrophoresis time-of-flight mass spectrometry of paraquat and diquat herbicides

✍ Scribed by Iulia M. Lazar; Milton L. Lee

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 120 KB
Volume: 11
Category: Article
ISSN: 1040-7685
DOI: 10.1002/(sici)1520-667x(1999)11:2<117::aid-mcs4>3.0.co;2-x

No coin nor oath required. For personal study only.

✦ Synopsis

Capillary electrophoresis CE and mass spectrometry MS were investigated for the analysis of paraquat and diquat herbicides. The mass spectrometer Ž . was a home-built time-of-flight instrument TOFMS equipped with an electro-Ž . spray ionization ESI source. A coaxial liquid sheath ESI source was utilized for interfacing the CE to the TOFMS, and mass spectra were acquired with both liquid sheath and microspray sources. The ESI-TOF spectra of paraquat and diquat were dependent on the background electrolyte composition; singly or doubly charged ions were displayed preferentially. Volatile buffer systems, compatible with the ESI-MS, were used in mixed aqueousrorganic solvents. By using the sample stacking technique at the CE injection port, low femtomole detection was achieved from 5 M solutions.

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