12.07.2015 Views

The Impact of Pesticides - Academy Publish

The Impact of Pesticides - Academy Publish

The Impact of Pesticides - Academy Publish

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

In Bacninh, low concentrations <strong>of</strong> ΣHCH were also detected in 29 <strong>of</strong> 40 soilsamples (Table 8). <strong>The</strong> ΣHCH concentrations in agricultural areas ranged from N.Dto 9.54 ng g -1 (mean 7.38 ± 2.17 ng g -1 ), while those from towns and traditionalvillages ranged from N.D to 5.86 ng g -1 (mean 1.58 ± 2.18 ng g -1 ). γ-HCHconcentrations in the analysed soil were also much lower than MAC (γ-HCH < 100ng g -1 ). Similar to the explanations for Hanoi, the contamination <strong>of</strong> HCH originatedin the usage as pesticides for crop protection and as vector control for public healthpurposes. Obtained results show that the level <strong>of</strong> HCH contamination in Bacninh issimilar with those from Hanoi. At present, <strong>of</strong>ficial information on HCHconsumption in Hanoi and Bacninh is not available. Thus, it is not possible to assessin detail the relation between the really used HCH quantity and the contaminationstatus. Results <strong>of</strong> table 7 and table 8 shows that HCH mean concentrations inagricultural areas from Bacninh are higher than those in other areas in Hanoi but thedifference is not remarkable.Table 8. Concentrations <strong>of</strong> HCH isomers (ng g -1 dw) in the surface soil fromBacninhLocation α-HCH β-HCH γ-HCH δ-HCH ΣHCHA. Agricultural areasTuSon 1 N.D –3.97(2.85)TienDu 1 3.09 –4.05(3.55)Bacninhtown 11.47 –2.36(1.89)YenPhong 1 2.08 –3.08(2.55)N.D – 4.56(3.35)3.35 – 4.07(3.95)2.05 – 2.96(2.35)2.86 – 3.46(3.09)B. Towns and traditional villagesTuSon 2 N.D - 3.65(0.89)N.D - 2.58(1.05)TienDu 2 N.D - 1.79(0.88)Bacninhtown 2N.D - 1.56(0.29)N.D - 1.98(1.05)N.D - 1.75(0.35)N.D –0.88(0.59)0.57 –1.17(0.86)0.45 –0.55(0.49)0.57 –0.85(0.66)N.D -0.66(0.26)N.D -0.45(0.25)N.D -0.39(0.08)N.D –0.93(0.45)0.65 –0.99(0.76)0.46 –0.98(0.59)0.38 –0.89(0.58)N.D -0.35(0.15)N.D -0.35(0.18)N.D -0.49(0.09)N.D – 9.45(7.19)8.36 –9.58 (9.08)4.69 –6.78 (5.35)5.97 –8.28 (6.88)N.D - 5.86(2.35)N.D - 4.57(2.35)N.D - 4.19(0.85)YenPhong 2 N.D N.D N.D N.D N.DWhen compared with other regions in the world (Table 9), the analysedconcentrations <strong>of</strong> ΣHCH in Hanoi and Bacninh are comparable with those <strong>of</strong><strong>Academy</strong><strong>Publish</strong>.org - <strong>The</strong> <strong>Impact</strong> <strong>of</strong> <strong>Pesticides</strong>305

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!