STUDY ON DETERMINATION OF LINEAR SILOXANES IN INDOOR DUST FROM SEVERAL NORTHEARN CITIES, VIETNAM

Abstract

   In this study, seven linear siloxanes were found in indoor dust collected from four northerncities of Vietnam during March-May, 2014. The total concentration of linear siloxanes in 46indoor dust samples ranged from not detected to 1830 ng/g (mean: 262 ng/g). Theconcentration of linear siloxanes in dust samples collected from homes is higher than othermicroenvironments such as laboratories, offices, and public places. Comparison between foursurveyed cities, the dust samples collected from HaNoi contained the highest siloxaneconcentrations. Among 7 linear siloxanes, L8 was measured at the highest levels and morefrequency (mean: 117 ng/g and frequency: 78,3%). Based on the measured concentrations,the human exposure to linear siloxanes through dust ingestion were estimated for various agegroups. The exposure doses to linear siloxanes for infants, toddlers, chidren, teenagers, andadults were 0.983; 0.873; 0.409; 0.230, and 0.187 ng/kg/day, repestively.

Key words: Linear siloxanes, indoor dust, polysiloxanes, human exposure