A SEQUENTIAL SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF PARAQUAT AND DIQUAT IN PLASMA

Authors
SELLERO IS LOPEZRIVADULLA M CRUZ A BERMEJO A FERNANDEZ P
Citation
Is. Sellero et al., A SEQUENTIAL SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF PARAQUAT AND DIQUAT IN PLASMA, Analytical letters, 26(9), 1993, pp. 1891-1904
Citations number
29
Categorie Soggetti
Chemistry Analytical
Journal title
Analytical letters → ACNP
ISSN journal
00032719
Volume
26
Issue
9
Year of publication
1993
Pages
1891 - 1904
Database
ISI
SICI code
0003-2719(1993)26:9<1891:ASSMFT>2.0.ZU;2-Z
Abstract
A sequential spectrophotometric method for the simultaneous determinat ion of paraquat and diquat in plasma using second-derivative spectrosc opy after ion-pair liquid-liquid extraction was developed. The paraqua t and diquat in the last extract are reduced with alkaline sodium dith ionite to coloured complexes whose absorption peaks appear at a differ ent wavelength. The two herbicides can thus be determined sequentially over the wavelength ranges 454.3-446.4 nm (diquat) and 460-396 nm (pa raquat), respectively.