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A Sequential Spectrophotometric Method for the Determination of Paraquat and Diquat in Plasma

 

作者: I.Sánchez Sellero,   M. López-Rivadulla,   A. Cruz,   A. Bermejo,   P. Fernández,  

 

期刊: Analytical Letters  （Taylor Available online 1993）
卷期: Volume 26, issue 9  

页码: 1891-1904

 

ISSN:0003-2719

 

年代: 1993

 

DOI:10.1080/00032719308017438

 

出版商: Taylor & Francis Group

 

关键词: paraquat;diquat;sequential determination;second-derivative spectrophotometry;plasma

 

数据来源: Taylor

 

摘要:

A sequential spectrophotometric method for the simultaneous determination of paraquat and diquat in plasma using second-derivative spectroscopy after ion-pair liquid-liquid extraction was developed. The paraquat and diquat in the last extract are reduced with alkaline sodium dithionite to coloured complexes whose absorption peaks appear at a different wavelength. The two herbicides can thus be determined sequentially over the wavelength ranges 454.3—446.4 nm (diquat) and 460—396 nm (paraquat), respectively.

 

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