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. 2019 Jan 1;2019:4687685. doi: 10.1155/2019/4687685

Table 1.

Physicochemical parameters and water quality index (WQI) of the water sampled at the Reconquista river.

Parameters Units Methodology Reconquista River water Argentine 
Guidelinesa
(mg/L)
Temperature °C 11.5 ≤ 45
pH UpH Hanna field meter 7.9 ± 0.1 (3) 6.5–10
Conductivity µS/cm Hach field meter 720 ± 5 (3)
Turbidity UNF 94 ± 2 (3)
Hardness mg CaCO3/L EDTA titration 65 ± 5 (3)
Alkalinity mg CaCO3/L H2SO4 titration 678.6 ± 5.8 (3)
Chlorides mg Cl/L AgNO3 titration 27 ± 1 (3)
DO mg O2/L Iodometric 3.4 ± 0.1 (3)
Ammonium mg N-NH4+/L Colorimetry 0.41 ± 0,03 (3) 0.05–0.47
Nitrites mg N-NO2/L Colorimetry 0.05 ± 0.01 (3) ≤ 0.06
PRS mg P-PO43-/L Colorimetry 0.29± 0.004 (3)
BOD5 mg O2/L Iodometric 1.93 ≤ 50
COD mg O2/L Colorimetry 18 ≤ 250
COD/BOD5 9.33
WQI 7.33
Heavy metal mg/L Atomic absorption spectrophotometry
Cr < 0.005 0.002
Pb < 0.010 0.001
Cd < 0.005 0.0001–0.0004
Cu 0.010 0.002–0.004
Zn 0.013 ≤ 0.030
As 0.009 ≤ 0.03

aArgentine Surface Water Guidelines for protection of aquatic life or maximum allowable content in effluents disposed in a water body. Data are expressed as mean ± SEM of three readings.