Photometry Compendium Episode 6
Optical Reagent-Free Measurement
Besides the methods that use a chemical reaction to create a concentration dependant colour change, which can then be measured, there are many substances that can be measured without a colour reaction provided they absorb light within the wave length range of the photometer.
To date, used exclusively in water treatment plants, a technique is available which is able to detect several parameters simultaneously while directly determining cumulative parameters like the “Chemical Oxygen Demand (COD)” in addition.
This technology is now available for lab photometers and, under certain conditions, makes it possible to measure COD, nitrate and nitrite content quickly, directly, without any reagents or an extraction process, therefore making it environmentally friendly.
Do you have any questions regarding photometry? Please contact WTW!