Comparison of extraction methods for triazine herbicides in root crops using electrolytic conductivity detection

1974 ◽  
Vol 22 (1) ◽  
pp. 137-140 ◽  
Author(s):  
James F. Lawrence
Keyword(s):  
Extraction Methods ◽  
Electrolytic Conductivity ◽  
Triazine Herbicides ◽  
Conductivity Detection ◽  
Root Crops

Evaluation of Electrolytic Conductivity Detection for Gas-Liquid Chromatographic Screening of Some Organonitrogen Herbicides and Fungicides in Foods

1977 ◽  
Vol 60 (4) ◽  
pp. 979-981
Author(s):  
James F Lawrence ◽  
Harry A McLeod
Keyword(s):  
Petroleum Ether ◽  
Methylene Chloride ◽  
Electrolytic Conductivity ◽  
Conductivity Detection ◽  
Organic Extracts ◽  
Liquid Chromatographic

Abstract Electrolytic conductivity detection for the gas-liquid chromatographic (GLC) screening of 15 organonitrogen herbicides and fungicides was investigated. Spiked samples of crop material were extracted with acetone and the filtered sample extracts were partitioned with methylene chloride-petroleum ether (1+1) followed by second and third extractions with methylene chloride. The combined organic extracts were evaporated to dryness and the residues were dissolved in hexane for cleanup on a 2% deactivated Fiorisil column. The pesticide fractions were determined directly by GLC. All pesticides could be detected at 0.1 ppm in the foods studied.

Gas-Solid Chromatographic Confirmation of Vinyl Chloride Levels in Oils and Vinegars by using Electrolytic Conductivity Detection

1977 ◽  
Vol 60 (3) ◽  
pp. 576-578
Author(s):  
B Denis Page ◽  
Ronald O’Grady
Keyword(s):  
Vinyl Chloride ◽  
Electrolytic Conductivity ◽  
Conductivity Detection ◽  
Flame Ionization ◽  
Ionization Method

Abstract A gas-solid chromatographic headspace method has been developed for the quantitative confirmation of vinyl chloride (VC) in oils and vinegars. The method, based on the electrolytic conductivity detector, permits quantitative confirmation of VC residues as low as 0.05 and 0.02 ppm for oil and vinegar, respectively. A number of samples were analyzed by using a previously reported flame ionization method and the proposed technique. The results by using the latter technique averaged 5% lower.

Sign in / Sign up

Export Citation Format

Share Document