Heavy metal concentrations in surface water samples were achieved QCVN 08-MT: 2015 / BTNMT, type A1; while levels of mercury (Hg), content and technology is not detected (Hg <0.0005 mg / L; CN: <0.002 mg / L); As at 04 points concentrations undetectable (<0.0010 mg / l) is NM2, NM3, NM4, NM6, remaining at 04 points (NM1, NM5, NM7, NM8) ranged from 0.0012 to 0, 0016 mg / l. Concentration of copper (Cu) ranged from 0.0024 to 0.0125 mg / L, zinc (Zn) ranged from 0.0207 to 0.0341 mg / L, at 04 points Cd levels were undetectable (< 0.0012 mg / L) is the point NM1, NM3, NM4, NM6, remaining at 04 points (NM2, NM5, NM7, NM8) Cd concentrations ranging from 0.0014 to 0.0019 mg / L; levels of lead (Pb) ranged from 0.0019 to 0.0092 mg / L.
In general, a number of heavy metals such as As, Cd, Pb, Cu decreased compared to the sampling period 2015 rainy season in many points sampling levels of As, Cd not found; Hg content, no change in CN all sampling points are not detected.
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