Derivative ratio analysis: A new method for measurement of steroids and other compounds with specific functional groups using radioassay by gas-liquid chromatography

1963 ◽  
Vol 6 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Arthur Karmen ◽  
Irmgarde McCaffrey ◽  
Bernard Kliman
Keyword(s):  
Liquid Chromatography ◽  
Functional Groups ◽  
New Method ◽  
Gas Liquid Chromatography ◽  
Ratio Analysis

Inverse Gas–Liquid Chromatography Study of Asphalt Composition and Oxidative Aging

2005 ◽  
Vol 1901 (1) ◽  
pp. 18-23 ◽  
Author(s):  
Sang-Soo Kim ◽  
Raymond R. Robertson ◽  
Jan F. Branthaver
Keyword(s):  
Liquid Chromatography ◽  
Chemical Composition ◽  
Functional Groups ◽  
Asphalt Binder ◽  
Fatigue Cracking ◽  
Exchange Chromatography ◽  
Gas Liquid Chromatography ◽  
Retention Behavior ◽  
Oxidative Aging ◽  
Highly Correlated

The chemical composition of an asphalt binder significantly affects oxidative aging and interactions with both aggregate and binder modifiers. In turn, it may cause premature asphalt pavement failures through fatigue cracking, moisture damage, or other failure mechanisms. Analytical chemical procedures, such as ion exchange chromatography, are time-consuming and cost prohibitive as routine tests. Inverse gas–liquid chromatography (IGLC) is a relatively faster and simpler technique that provides the chemical composition and polarity characteristics of asphalt samples. In IGLC, asphalt is used as the liquid substrate on an inert support in a GLC column and is characterized by measuring the retention behavior of selected test compounds that possess different functional groups. The interaction behaviors between seven test compounds and 19 unaged and GLC column–aged asphalt samples were determined and compared with functional group concentrations presented in the asphalts and in a nonaqueous potentiometric titration study. It was found that the retention behaviors of the test compounds are strongly related to the types and concentrations of functional groups in the asphalt. For unaged asphalts, the retention behavior of strongly basic test compounds is highly correlated with the concentration of acidic functional groups in asphalts. The retention behavior of phenol with oxidatively aged asphalts is highly correlated with the concentration of sulfoxide, one of the major products of asphalt oxidation.

scholarly journals Modern modification of the method for determination of organochlorine pesticides in organic vehicles

2017 ◽  
Vol 188 (1) ◽  
pp. 244-250
Author(s):  
Andrey P. Chernyaev ◽  
Ekatherina Yu. Rychkova ◽  
Nickolay B. Kondrikov ◽  
Ekatherina N. Zyk
Keyword(s):  
Liquid Chromatography ◽  
Organochlorine Pesticides ◽  
Total Content ◽  
Liquid Extraction ◽  
Marine Organisms ◽  
New Method ◽  
Gas Liquid Chromatography ◽  
Okhotsk Sea ◽  
Liquid Liquid Extraction

New method for determination of organochlorine pesticides (DDT and its metabolites, HCH and its isomers) is presented. The method includes a liquid-liquid extraction of pesticides under ultrasound and the substance analysis by gas-liquid chromatography. The degree of DDT and γ-HCH extracting from tissues of marine organisms is (78 ± 2) % and (91 ± 2) %, respectively. The total content of organochlorine pesticides in muscles of walleye pollock from the Okhotsk Sea is evaluated by this method in the range from 25 to 73 pg/g of lipids.

A study of asphalt-aggregate interactions using inverse gas-liquid chromatography

1974 ◽  
Vol 24 (11) ◽  
pp. 645-654 ◽  
Author(s):  
F. Alan Barbour ◽  
Richard V. Barbour ◽  
J. Claine Peterson
Keyword(s):  
Liquid Chromatography ◽  
Gas Liquid Chromatography

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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