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GUIDE DE L’UTILISATEUR CODE 80158.02 REV 0 02/10/09 (Sous réserve de modification) Pag.: 28
DQO-01 DETERMINATION OF THE CHEMICAL DEMAND OF OXYGEN (C.O.D.)
Calculation of the results:
15- The chemical demand of oxygen, C.O.D., is expressed in mg of oxygen per litter, it is calculated by the
following formulae:
Volume of reagents for other ranges of C.O.D. determination
Note: for some of these ranges it could be necessary another shapes of the tubes and metallic bloc. These are
specified here for your information.
8000 x c x (V
1
-V
2
)
C.O.D. =
(mgO
2
/l) V
0
Macro/50ml Macro/10ml Micro/10ml Micro/low COD
Range: 50-800 mg/l COD 50-800 mg/l COD 50-800 mg/l COD 50-800 mg/l COD
Sample: 50ml 10ml 2ml 2ml
H2SO4: 75ml 15ml 2.5ml 2.5ml
K2Cr2O7: 0.3065g * 0.0613g * 0.00245g 0.00245g
AgSO4: 0.75 g 0.15 g 0.03 g 0.03 g
HgSO4: 1.0 g 0.2 g 0.03 g 0.03 g
where:
c is the concentration in mol/l of the solution of the iron sulphate (II) and of amonium already calculated (3).
V is the demanded volume, in ml, of the sample used for the determination before the dilution (if it exists).
V1 is the demanded volume, in ml, of the solution FAS (3) in the titration to the white.
V2 is the demanded volume, in ml, of the solution FAS (3) in the titration of the samples.
These values can be reduced 1/10 for the test with samples which COD is on the range 0-80.
CET ESSAI DEMANDE LA MANIPULATION DE SUBSTANCES DANGEREUSES
MANIPULATION OF CORROSIVE PRODUCTS IS REQUIRED
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