Sampling And Analysis Of Carbonyl In Laboratory Atmospheres

Abstract

A sampling and analytical method has been developed for carbonyl concentrations in different laboratory atmospheres at the faculty of Science Bayero University; Kano, Nigeria using cold oximation followed by titrimetric finish. The analysis was carried out between 008 and 1800 hrs from from October 2002 to June 2003. Samples of air were collected from each laboratory by bubbling through 6% hydroxylamine hydrochloride releasing hydrochloric acid equivalent to the carbonyl in the air. The collection was 100 percent in the range 2-50 ppb carbonyl and the trapping solution was stable for over 30days both before and after carbonyl collection. The carboynl concentrations in each laboratory are functions of the activities and type of chemicals stored or used in them. The mean carbonyl level in these laboratories was 14.63ppb with a coefficient of variations of 11.25%.

KEY WORDS: Carbonyl, determination, laboratories Bayero University, Kano, Nigeria.

Global Journal of Environmental Sciences Vol.3(1&2) 2004: 45-49