The Impact of Pesticides - Academy Publish

In general, agricultural scale production in Bacninh is higher than Hanoi. Therefore,the larger quantity of DDT used for crop protection from pest is possible. This mightbe the reason for higher levels of DDT contamination. In non-agricultural areas suchas town and traditional village, ΣDDT was also detected, which ranged from N.D to39.45 ng g -1 (mean 12.09 ± 16.42 ng g -1 ). It might be as results of DDT used as avector control for public health purposes in these areas. Unfortunately, the officialquantitative information on the cumulative use of DDT in Hanoi and Bacninh overthe years is lacking. Thus, it is impossible to calculate their possible quantity whichpenetrated into the soil. According to Hung et al. (2002), 24,042 tonnes of technicalDDT were used against malaria and mosquitoes from 1957 to 1994 in Vietnam.When compared with other regions in the world (Table 6), the analysedconcentrations of ΣDDT in Hanoi are comparable with those of Shanghai (China),lower than those in Tasman (New Zealand) or Beijing (China) and higher thanresidues found in others regions.Table 6. ΣDDT concentration in soil from other regions in the world (ng g -1 )Locations ΣDDT ReferencesShanghai (China) 18 – 142 Nakata et al. (2005)Guanting (China) N.D – 94.07 Zhang et al. (2005)Tasman (New Zealand) 30 – 34500 Gaw et al. (2006)Beijing (China) 0.77 – 2178 Zhu et al. (2005)Tanzania