Sample preparation can be used in biology and ecology for gas chromatographic determination of organochlorine pesticides (OCP), namely, α-, β- and γ-isomers of hexachlorocyclohexane (HCH), dichlorodiphenyltrichloroethane (DDT) and its metabolites dichlorodiphenyldichloroethane (DDD) and dichlorodiphenyldichloroethylene (DDE) in various aquatic organisms (molluscs, fish, birds and mammals) containing lipids (because organochlorine pesticides are lipophilic) in the internal organs and tissues, fat, skin and feather cover. The method is easy to implement and economically profitable, it can be used in laboratories without special extraction equipment, as well as in the field, with a minimum set of glassware and reagents. The result of this process is an increase of efficiency and precision of research through a more complete extraction of pesticides chemically bonded with lipids using n -hexane and a reduction of the number of steps needed for the extraction and purification of co-extrusive substances with concentrated sulphuric acid.
Abstract
Sample preparation can be used in biology and ecology for gas chromatographic determination of organochlorine pesticides (OCP), namely, α-, β- and γ-isomers of hexachlorocyclohexane (HCH), dichlorodiphenyltrichloroethane (DDT) and its metabolites dichlorodiphenyldichloroethane [...]
The article discusses the process of preparing samples with an anodic Al2O3 layer for tribological tests in the combination of sliding, reciprocating on the T17 tester. The method of cutting, grinding, drilling, threading, gluing, etching, and anodizing samples used in laboratory conditions was presented. As shown in the article, the number of factors influencing the surface quality of the oxide layer produced in terms of tribological associations is significant; therefore, the appropriate sample preparation methodology is so important.
Abstract
The article discusses the process of preparing samples with an anodic Al2O3 layer for tribological tests in the combination of sliding, reciprocating on the T17 tester. The method of cutting, grinding, drilling, threading, gluing, etching, and anodizing samples [...]
Sample Preparation Method for the Determination of Organochlorine Pesticides in Aquatic Organisms by Gas Chromatography 