The determination of chemical oxygen demand (cod) what are the factors influencing the apparatus and equipment
Atmospheric pressure, temperature, gas volume is required
If use digestion spectrophotometry. 1, calibration. If long time no calibration or not in accordance with the manual calibration instrument may cause certain deviation. 2, inside and outside tube wall cannot have dirt. 3, add resolution liquid. Should use sophisticated equipment to add. 4, digestion temperature and time setting. 5, the sample to be tested visual situation, whether to have floc, clean, impurities and so on.
Sample pretreatment, dissolve quantity, temperature, pH value, the sludge for determination of chemical oxygen demand (cod) will have certain influence
