Exposure to metallic mercury in workers in a tropical chloralkali plant evaluated through urine analysis, Rio de Janeiro, Brazil.
International Conference on Mercury as a Global Pollutant. Hamburg (DEU), 1996/08/04.
Occupational exposure to Hg vapour was investigated in 78 workers during three periods with different temperatures : August 1991, December 1991, and February 1992.
Each individual was sampled twice in each period ; before and after a six working days period (with a two free days interval).
As an attempt to normalise Hg excretion urine was sampled always after a normal 8 hours night sleeping and immediately frozen.
Mineralisation was done with acid and oxidant mixture and determination by cold vapour Atomic Absorption Spectrophotometry (Varian VGA-76 and AA-1475).
Analytical accuracy was controlled by routine analysis of certified reference material (Seronorm TM trace elements, Nycome As diagnostics Olso - Norway) and all samples were analysed in triplicates.
Of a total of 355 samples analysed 13% were over the maximum limit for occupational exposure (50 mug. l-1 or ppb).
From the 78 individuals investigated 13% presented average value smaller than 10 ppb ; just 8% had the average over 50 ppb ; 64% showed averages smaller than 30 ppb ; and 28% were between 30 and 50 ppb.
Seasonal variation was observed with the highest values in the hottest periods.
High variability was observed in the same individual even within an interval of just few days (seven days).
No increase of Hg in urine after the six days of exposure was observed when compared with the values after the two free days interval.
Mots-clés Pascal : Mercure, Métal lourd, Vapeur, Exposition professionnelle, Médecine travail, Homme, Brésil, Amérique du Sud, Amérique, Surveillance biologique, Urine, Liquide biologique
Mots-clés Pascal anglais : Mercury, Heavy metal, Vapor, Occupational exposure, Occupational medicine, Human, Brazil, South America, America, Biological monitoring, Urine, Biological fluid
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0465732
Code Inist : 002B03L05. Création : 03/02/1998.