Determination of the chemical oxygen demand index (ST-COD)

Applications of Lovibond Reagents » Applications reagents
Reagents for Photometry » Applications reagents
Reagents also suitable for use in Hach® (Disclaimer) devices » Applications reagents

  • Waterproof*)
  • Scroll Memory
  • Automatic Switch-Off
  • Real-Time-Clock and Date
  • Calibration Mode
  • Backlit Display
  • Storage Function
  • Suitable for use as a reference instrument
    *) as defined in IP 68, 1 hour at 0.1 meter, buoyant
ST-COD sealed tubes ready for use
Suppression of chloride interference
up to 1000 mg/l (LR & MR)
up to 10000 mg/l (HR)3 ranges:
Low range: 0 – 150 mg/l,
Middle range: 0 – 1500 mg/l,
High range: 0 – 15000 mg/l

Waste water parameter COD

The chemical oxygen demand, ST-COD value
(ST = small scale sealed tube), of water as determined by this dichromate method can be considered as an estimate of the theoretical oxygen demand, i.e. the amount of oxygen consumed in total chemical oxidation of the organic constituents present in the water.

MD 200 COD VARIO Photometer

With a measuring range from 0 to 15,000 mg/l O2, the Lovibond® COD VARIO photometer are suitable for waste water testing.

Two LEDs light sources with long-term stability
1 = 430 nm; λ2 = 610 nm, according to ISO 15705:2002), a waterproof sample chamber, a large digital display, and the user-friendly keypad ensure maximum operating reliability and convenience.


The Lovibond® COD VARIO set-up allows highly sensitive and precise water testing with minimum effort. It measures the ST-COD concentration by photometric detection employing a linear relationship between absorbance and concentration.

After adding the sample to a Lovibond® COD VARIO tube test (LR, MR according to ISO 15705:2002), it is heated in the reactor and then analysed in the photometer.


0 –150 mg/l O2 ±3,5%*) FS
0 –1500 mg/l O2 ±3,5%*) FS
0 –15000 mg/l O2 ±3,5%*) FS

*tolerance based on the use of potassium-hydrogenephthalate standards (DIN 38409)

Scroll Memory (SM)

To avoid unnecessary scrolling for the required test method, the instrument memorizes the last method used before switching off the instrument. When the instrument is switched on again, the scroll list comes up with the last used test method first.


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