Mathematical algorithm for qualitative and semiquantitative analysis of petroleum hydrocarbons in solid wastes using on-line gas chromatography.

Non-degradated mineral-oils like gasoline, solvent naphtha, diesel fuel, fuel and lubricating oils provide a characteristic fingerprint gas chromatogram. This visual classification, e.g. in solid wastes, is complicated due to the simultaneous presence of several mineral-oils. Therefore, a mathematical algorithm for the separation of gas chromatographic fingerprint of "single mixtures" of aliphatic hydrocarbons is developed. The technique is essential for analysis of time-overlapping "single mixtures" of petroleum hydrocarbons (so-called "complex mixtures") and it relies on the concentration-varying hydrocarbons during evaporation. It is possible to separate the data from the gas chromatogram of a "complex mixture" of hydrocarbons into the chromatograms of the pure "single mixtures" and to give their respective concentrations. A synthetic "complex mixture" of kerosene, diesel fuel and lubricating oil is used to illustrate the method.

[Monitoring sodium valproate treatment of epilepsy in the development years]. / Walproinian sodu w leczeniu monitorowanym padaczki wieku rozwojowego.

The levels of sodium valproate were determined in the blood and saliva of children treated for epilepsy. The determination of drug in saliva may be a simple test checking whether the patient is taking the drugs systematically, and makes possible determination of the approximate level in the serum without blood sampling. In doubtful cases poorly responding to treatment serial monitoring of valproic acid should be undertaken.