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| The analysis sample is heated at 148 °C during a certain time in a strong sulphuric acidic environment in presence of silver sulphate and mercury(II) sulphate with a surplus of potassium dichromate. The present oxidizable substances are oxidized by the potassium dichromate. The consumed quantity of potassium dichromate is determined spectrofotometrical and is a measure for the chemical oxygen consumption.The measurement in the high range (up to 1000 mg/l O2) are performed at a wavelenght of 605 nm. Measurements in the range up to 150 mg/l O2 are performed at a wavelenght of 440 nm. |
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| Matrices qualified by the Dutch RvA: | Wastewater, Groundwater, Surface water |
| Reporting limit: | 5 mg O2/l, matrix dependent |
| Measurement uncertainty: | 20% |
| Sustainability: | 28 days
, if conserved with H2SO4
|
| Sampling bottle: | Glass
, brown
, 250 ml
, conservation with H2SO4
(fill up to the neck of the bottle)
|
