The change of polychlorinated biphenyls content in soil of coastal zone of Lake Baikal in 1997–2012

The content of polychlorinated biphenyls (PCBs) in the soil of coastal zone of Lake Baikal in 1997–2012 has been analyzed. Analysis of the samples taken at the same sites over the years has revealed the changes of the total PCBs content. On top of that, the PCBs concentration has been correlated with the organic carbon content in the soil, and the features of the individual congeners ratio under the different environmental conditions have been discovered.     

Изучеиис кииетики изотоииого обмсна кислорода между водой и углекислым газом в ирисутствии растворимых добавок

The δ¹³C values obtained on 25 crude oil samples representing the main producing oil fields in Egypt indicate a significant difference between the Gulf of Suez Province and the Western Desert Province which is attributed to environmental difference in the source rocks of the two province. Variations within each of the two provinces were compared and related to age, thermal maturity as well as migration processes. The variations in δ¹³C values were also releated to variations in GOR and API gravity values.     

Hydroxy- and alkoxymethylation of polyfluoroalkyl pyrazoles

A synthetic route to 1-hydroxy- and 1-alkoxymethyl-3-polyfluoroalkylpyrazoles via regioselective N-hydroxy- and alkoxymethylation of N-unsubstituted pyrazoles with paraformaldehyde has been proposed. The alkoxyalkylation of polyfluoroalkylpyrazoles proceeds in aqueous-alcohol medium, whereas hydroxymethylation requires anhydrous conditions.