Search results for: 2.0ml Screw Cap Micrewtube
#19219474 
2009/02/14
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Trihalomethane formation during water disinfection in four water supplies in the Somes river basin in Romania.
After the discovery of chloroform in drinking water, an extensive amount of work has been dedicated to the factors influencing the formation of halogenated disinfections by-products (DBPs). The disinfection practice can vary significantly from one country to another. Whereas no disinfectant is added to many water supplies in Switzerland or no disinfectant residual is maintained in the distribution system, high disinfectant doses are applied together with high residual concentrations in the distribution system in other countries such as the USA or some southern European countries and Romania. In the present study, several treatment plants in the Somes river basin in Romania were investigated with regard to chlorine practice and DBP formation (trihalomethanes (THMs)). Laboratory kinetic studies were also performed to investigate whether there is a relationship between raw water dissolved organic matter, residual chlorine, water temperature and THM formation.Dumitru Ristoiu, Urs von Gunten, Aurel Mocan, Romeo Chira, Barbara Siegfried, Melinda Haydee Kovacs, Sidonia Vancea
1617 related Products with: Trihalomethane formation during water disinfection in four water supplies in the Somes river basin in Romania.
50μl11roll100 μg
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#2499219 //
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Facilitated micromethod for measurement of metabolically generated 14CO2, with application to measurement of ornithine decarboxylase.
A modified microassay for the determination of metabolically generated 14CO2 is described and is applied to the measurement of ornithine decarboxylase in animal tissue preparations. In this technique, the reaction takes place in a microcentrifuge tube inside a 20-ml scintillation vial that also contains a center well with a CO2-trapping agent. The vial is sealed with a silicone septum-lined plastic screw cap. After the initial incubation period during which the enzymatic reaction occurs, acid is injected through the septum into the reaction tube, and 14CO2 is released during a second incubation period. The reaction vial is then removed, counting solution is added to the scintillation vial, and radioactivity is measured. Linearity is present with respect to both increasing amounts of tissue and incubation time. Recovery of evolved 14CO2 was greater (97.5 vs 91.5%) and variation between replicate samples was less (coefficient of variation 2.7 vs 8.5%) when the modified microassay was compared with an assay system that requires removal of the screw cap from the vial before acid injection. The modification allows greater safety and facilitated assays, which could result in savings of both time and laboratory personnel. Special precautions for the use of NaH14CO3 as the recovery marker are noted.D W Gaines, L Friedman, R C Braunberg