Analysis of sulfonylurea herbicides by gas-liquid chromatography. 2. Determination of chlorsulfuron and metsulfuron-methyl in soil and water samples

1993 ◽  
Vol 41 (3) ◽  
pp. 396-401 ◽  
Author(s):  
Peter. Klaffenbach ◽  
Patrick T. Holland
Keyword(s):  
Liquid Chromatography ◽  
Water Samples ◽  
Gas Liquid Chromatography ◽  
Sulfonylurea Herbicides ◽  
Metsulfuron Methyl ◽  
Soil And Water

Bioremediation of oily hypersaline soil and water via potassium and magnesium amendment

2013 ◽  
Vol 59 (12) ◽  
pp. 837-844 ◽  
Author(s):  
D.M. Al-Mailem ◽  
M. Eliyas ◽  
S.S. Radwan
Keyword(s):  
Liquid Chromatography ◽  
Carbon Source ◽  
Chemical Analysis ◽  
Water Samples ◽  
Sole Carbon Source ◽  
Microbial Consortia ◽  
Gas Liquid Chromatography ◽  
Hypersaline Environments ◽  
Promising Practice ◽  
Soil And Water

Ten hydrocarbonoclastic halobacterial species and 5 haloarchaeal species that had been isolated on a mineral medium with oil as the sole carbon source grew better and consumed more crude oil, as measured by gas–liquid chromatography, in media receiving between 0.50 and 0.75 mol/L KCl and between 1.50 and 2.25 mol/L MgSO4. Chemical analysis revealed that within a certain limit, the higher the KCl and MgSO4 concentrations in the medium, the more K+ and Mg2+, respectively, was accumulated by cells of all the tested halobacteria and haloarchaea. Also, in experiments in which total natural microbial consortia in hypersaline soil and water samples were directly used as inocula, the consumption of hydrocarbons was enhanced in the presence of the above given concentrations of KCl and MgSO4. It was concluded that amendment with calculated concentrations of K+ and Mg2+ could be a promising practice for hydrocarbon bioremediation in hypersaline environments.

scholarly journals Оптимізація аналітичного контролю залишкових кількостей фунгіцидів цифлуфенаміду та дифеноконазолу у воді

2018 ◽  
Author(s):  
P. V. Stavnichenko ◽  
A. M. Antonenko ◽  
O. P. Vavrinevych ◽  
A. V. Stetsenko ◽  
S. T. Omelchuk. ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Water Samples ◽  
Analytical Determination ◽  
Gas Liquid Chromatography ◽  
Ecological Significance ◽  
Application Rates ◽  
The Cost ◽  
New Compounds ◽  
Active Substances

Introduction. Annually, the assortment and application rates of pesticides are supplemented with new compounds of various chemical classes. Methods for the determination of active substances in water by the method of gas-liquid chromatography are known to provide for the determination of only one fungicide, which is quite costly. Therefore, it remains an actual goal to develop a method that will simultaneously identify different substances in one sample. Such a technique allows significantly increasing the speed of one definition and reducing the cost of conducting it. Such a method has not only economic but also ecological significance, since it can be effectively used for monitoring environmental studies.The aim of the study – to development a technique for the analytical determination of cyflufenamide and difenoconazole microquantities in water simultaneously.Research Methods. Research includes extraction, concentration and chromatography of prepared water samples. The quantitative determination of cyflufenamide and difenoconazole was carried out by gas-liquid chromatography using an electron-capture detector.Results and Discussion. The best result of active substances extraction from water samples was achieved using chloroform as an extractant. Chromatography conditions were established under which the retention time is: for cyflufenamide – 3.19 minutes; difenoconazole – 12.58 minutes. Limit of the quantification of this method for cyflufenamide is 0.001 mg/dm3, difenoconazole – 0.001 mg/dm3.Conclusions. The conditions for simultaneous determination of cyflufenamide and difenoconazole by the method of gas-liquid chromatography are developed with their simultaneous presence in the water sample, which allows significantly speeding up the analysis and reducing the cost of conducting it.

GASCHROMATOGRAPHIC DETERMINATION OF STEROIDS IN THE URINE OF PATIENTS WITH CUSHING'S SYNDROME

1971 ◽  
Vol 67 (2) ◽  
pp. 303-315 ◽  
Author(s):  
A. J. Moolenaar ◽  
A. P. van Seters
Keyword(s):  
Liquid Chromatography ◽  
Cushing’S Syndrome ◽  
Normal Subjects ◽  
Diagnostic Value ◽  
Cushing's Syndrome ◽  
Gas Liquid Chromatography ◽  
Obese Subjects

ABSTRACT The 17-oxosteroids were estimated in the urine of 27 patients with Cushing's syndrome by gas-liquid chromatography (G. L. C.). The values of the various steroid fractions are compared with those of normal subjects, patients with thyrotoxicosis and obese subjects. The effect of the age of the patients on the diagnostic value of the invidual 17-oxosteroids and their ratios is discussed.

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