PAHs and SOME ORGANIC SUBSTANCES IN CANALS SEDIMENT OF HO CHI MINH CITY

Abstract

    Investigate the findings related to PAHs monitoring and the organic components of these pollutants, which are particularly hazardous substances. Hence, it's crucial to comprehend the distribution of PAHs and their constituents within the canal sediment in urban locales. The monitoring findings of pollution indicators such as pH, NH₃, H₂S, and E.coli within canal sediments from November to December spanning 2019 to 2024 across ten basins in Ho Chi Minh City. The canals exhibit elevated concentrations of NH₃ in the upper layers, while H₂S levels are more pronounced in the bottom layers; specifically, NH₃ levels range from 1,500 to 2,500 ppm at the bottom layer and 1,600 to 2,700 ppm at the surface layer. H2S concentrations register between 1,400 and 2,400 ppm at the bottom and from 1,600 to 2,600 ppm on the surface. Moreover, PAHs are found in particularly high levels in Nam Tham Luong sections 1, 2, and 3 (with total PAHs exceeding 8,000 µg/kg), alongside significant NH₃ and H₂S concentrations (greater than 8,500 ppm). Some E. coli readings in certain canals are notably high, surpassing 10⁵ MPN/100ml, whereas other locations report much lower counts of less than 10² MPN/100ml. The contamination extends beyond the natural boundaries.