A Rapid Method for the Analysis of Diquat and Paraquat in Potatoes
作者:
BrianL. Worobey,
LuzG. Panopio,
期刊:
Analytical Letters
(Taylor Available online 1983)
卷期:
Volume 16,
issue 15
页码: 1235-1252
ISSN:0003-2719
年代: 1983
DOI:10.1080/00032718308077159
出版商: Taylor & Francis Group
关键词: N/P-GLC;Diquat;Paraquat;Potatoes;Herbicides
数据来源: Taylor
摘要:
A rapid method was developed for the analysis of paraquat dication (I) and diquat dication (II) as their diene reduction products (ID and IID respectively) in potatoes. Macerated potato tissue was spiked with various levels of the dications, 0.05, 0.5, and 5.0 ppm. The dications were reduced using a sodium borohydride/ethanol reduction procedure with reduction and simultaneous extraction in a single 50 ml glass-stoppered centrifuge tube. The diene reduction products were extracted into hexane and analyzed by gas-liquid chromatography (GLC) and a N/P-thermionic detector. Quantification by external standard method or internal standard method resulted in recoveries of 35, 38, 48 and 39,42, 64% for diquat and paraquat respectively. When a spiked macerate was well-mixed, recoveries were low due to adsorption; precision was within 5 5.4% (standard deviation). The importance of spiking technique was also illustrated. Upon thorough mixing and equilibration, of diquat spiked potatoes, recoveries were reduced dramatically. Adsorption of the dications and diene reduction products to glassware reduced recoveries and accounted for poorer precision; this latter effect was overcome by prior silanization of the glassware. Modification of existing NaBH4methods resulted in a procedure for I and II analysis requiring only 30 minutes per sample for complete analysis. Use of NaBH4reduction and analysis of I in potatoes has not been previously reported.
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