rivière et lac d'afrique

2009-07-16, 9:57 am

Benue River
Conductivity: K20 35–55 μS/cm
pH : 7.1–7.4

Corubal / Tomine River
Surface temperature: 22 °C
pH: 6.1
Ionic composition: Na 96.8 mg/l,
K 3.2 mg/l,
Ca 21.4 mg/l,
Mg 5.0 mg/l,
CO3 24.4 mg/l,
Cl 193.7 mg/l,
SO4 56.2 mg/l
SiO2 38.0 mg/l,
Fe 11.3 mg/l,
NO3 8.8 mg/l

Gambia River
Temperature: about 20° C
pH: 6.3

Niger River
Conductivity: K20 31 μS/cm (upper course)
Temperature: 19 – 30 °C (upper course)
pH: 7.2 (upper course), 6.7 – 6.8 (middle course)
Ionic composition:
At level of Central delta
Na 2.99 mg/l,
K 1.96 mg/l,
Ca 4.01 mg/l,
Mg - mg/l,
Cl 1.07 mg/l,
SO4 - mg/l,
At level of Kainji dam
Na 2.25 – 5.80 mg/l,
K - mg/l,
Ca 3.45 – 5.98 mg/l,
Mg 1.18 – 2.69 mg/l,
Cl trace -1.28 mg/l,
SO4 0 – 1.73 mg/l,
HCO3 24.64 – 38.67 mg/l,
NO3 1.43 – 6.29 μg/l,
PO4 0.483 – 3.102 μg/l.

Senegal River
Ionic composition:
Upper course
Na 2.5 mg/l,
K 2.4 mg/l,
Ca 10.0 mg/l,
Mg 1.0 mg/l,
HCO3 22.0 mg/l,
Cl 3.0 mg/l,
SO4 11.0 mg/l.
Lower course
Na 0.09 – 2.1 mg/l,
K 0.04 – 1.6 mg/l,
Ca 0.29 – 5.8 mg/l,
Mg 0.45 – 5.5 mg/l,
HCO3 0.50–30.5 mg/l,
Cl - mg/l,
SO4 - mg/l.

Kainji Lake
Conductivity: K20 46.6–99.6 μS/cm (Welcomme, 1972) mean: 55 μS/cm (Henderson, 1973)
Surface temperature: 23 – 31° C
Dissolved solids: 50 mg/l
pH: 6 – 7.6
Ionic composition:
Na 1.8 – 5.2 mg/l,
K 1.4 – 3.6 mg/l,
Ca 3.0 – 11.2 mg/l,
Mg 2.6 – 3.3 mg/l,
HCO3 + CO3 0.45 – 0.69 mg/l,
Total Fe 1.6 mg/l,
NO3-N 0.45 – 0.6 mg/l,
Total P 0.02 – 10.6 mg/l.

KOLENTE RIVER
Conductivity: K20 60 μS/cm
pH: 7.1

KONKOURE RIVER
Surface temperature: 19 – 25 °C (Upper reaches), 23 – 27 °C (Middle reaches), 25 – 29 °C (Lower reaches)
pH: from 5.9 (Upper reaches) to 6.2 (Lower reaches).
Ionic composition: Na 10 mg/l,
Ca 5.6 mg/l,
Mg 1.1 mg/l,
Al 1.4 mg/l,
Cl 4.8mg/l,
SO4 11.4 mg/l

MOA RIVER
Conductivity: K20 36 μS/cm
pH : 6.6

KABA RIVER
Conductivity: K20 35 – 55 μS/cm
pH: 7.1 – 7.4

CROSS RIVER
Conductivity: 10 – 25 μS/cm
pH: 6.2 – 7.4
PO4: 0.0 – 0.1 mg/l

OSHUN RIVER
Conductivity: K20: 57 – 96 μS/cm
Ionic composition:
Ca 5.94 – 11.03 mg/l,
Mg 1.32–5.6 mg/l,
Si 10 – 26 mg/l,
SO4 mostly above 5 mg/l,
NO3-N 100 – 373 mg/l,
PO4 7 – 80mg/l,

CROSS RIVER
Conductivity: 10 – 25 μS/cm
pH: 6.2–7.4
PO4: 0.0 – 0.1 mg/l

OSHUN RIVER
Conductivity: K20: 57 – 96 μS/cm (Egborge, 1971)
Ionic composition:
Ca 5.94 – 11.03 mg/l,
Mg 1.32 – 5.6 mg/l,
Si 10 – 26 mg/l,
SO4 mostly above 5 mg/l,
NO3-N 100 – 373 mg/l,
PO4 7 – 80 mg/l,

SOKOTO RIVER
Temperature: 18 – 30 °C
pH: 6.9 – 8.1
Hardness CaCO3: 27.5 – 103.0 mg/l,
Alkalinity CaCO3: 42.5 – 127.5 mg/l
Ionic composition:
Na 3.1 – 11.0 mg/l,
K 2.8 – 13.2 mg/l,
Ca 10.0 – 42.0 mg/l,
Mg 2.0 – 10.0 mg/l,
Cl 1.0 – 15.0 mg/l,
HCO3 25.9 – 77.8 mg/l,
SiO2 10.0 – 20.0mg/l,
Mn <0.025 – 0.075 mg/l,
Fe Total 0.2 – 1.4 mg/l,
NO2 0.003 – 0.07 mg/l,
NO3 0.11 – 0.44 mg/l,
NH4 0.04 – 0.12 mg/l,
PO4 0 – 0.1 mg/l

2009-07-17, 9:09 pm

merci pour toutes ces précieuses infos!!!! :)

2009-07-17, 10:53 pm

c'est pas fini!!

mais j'ai d'autre pas à finir.

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