Comparison of two validated gas-chromatographic methods for the determination of trihalomethanes in drinking water

In this paper the results obtained using two validated gas-chromatographic procedures on drinking water for the determination of trihalomethanes are compared. The volatile compounds, chloroform (CF), bromodichloromethane (BDCM), dibromochloromethane (DBCM) and bromoform (BF) were detected by purge and trap capillary column gas-chromatography with electrolytic conductivity detector (ELCD) and the simple and rapid gas-chromatographic method by electron capture detector (ECD) after liquid-liquid extraction with n-pentane. For purge and trap ELCD method the response for the volatile compounds was linear for the concentrations of 0.5 to 40 µg/L...

Metodo modificado para a determinacao de tiocianato em urina por cromatografia de troca ionica e espectrofotometria / Modified method for the determination of thiocyanate in urine by ion-exchange chromatography and spectrophotometry

E proposto um metodo cromatografico de troca ionica para a separacao de tiocianato presente em amostras de urina. O procedimento colorimetrico da sintese de Konig para a obtencao de complexos coloridos com piridina e p-PDA foi usada. O metodo analitico mostrou ser preciso, sensivel e pode ser usado para detectar doses internas de cianeto em individuos ou grupos de individuos em casos de tabagismo, exposicao ocupacional e ingestao excessiva de mandioca (Manihot esculenta Crantz) ou outros vegetais ricos em glicosideos cianogenicos