Author(s)

S. Pongpiachan, C. Choochuay & C. Kositanon

Abstract

Temporal and spatial distributions of mutagenicity index (MI) extracted from PM10 samples collected during 2006 from seven monitoring stations in an urban residential area of Bangkok were carefully investigated. During the dry season (i.e. November–February), MI values of Salmonella typhimurium TA 98 was higher than those collected during the wet season (i.e. May–July). The addition of S9 mixture resulted in a 9.8% increase in total mean of the bacterial mutagenicity index. For S. typhimurium TA 100 without S9 mix, the total mean of mutagenicity index was 7.4% higher than those of S. typhimurium TA 98 at the same condition. The addition of S9 mix was also 9.1% increased in the mutagenicity index of S. typhimurium TA 100. The correlation of mutagenicity index between S9 mix added and non-added of the S. typhimurium TA 98 was higher than S. typhimurium TA100. All studied stations showed MI values lower than the safety level of 2.0. Keywords: PM10, PAH, mutagenicity index, Bangkok, Thailand.

Keywords

PM10, PAH, mutagenicity index, Bangkok, Thailand