Photometer for peroxide in oils

The HI83730 portable photometer is used to determine the peroxide value in edible oils. Hanna’s portable photometers feature an advanced optical system. The combination of a special tungsten lamp, a narrow-band interference filter, and a silicon photodetector ensures accurate photometric readings every time. The exclusive cuvette locking system ensures that the cuvette is inserted into the measurement cell in the same position each time, maintaining a constant path length.

The HI83730 uses an adaptation of the CE 2568/91 method with the following modifications to measure peroxide values below 25.0 meq O₂/kg. When the reagent is added to a sample containing peroxides, the sample turns yellow. The higher the concentration, the deeper the color. The resulting color change is then analyzed colorimetrically according to the Beer-Lambert law. This principle states that light is absorbed by a complementary color, and the transmitted light depends on the concentration. For peroxide value determination, a narrow-band interference filter at 466 nm (blue) allows only blue light to be detected by the silicon photodetector, blocking all other visible light emitted by the tungsten lamp. As the reacted sample’s color change increases, the absorbance at the specific wavelength rises while transmittance decreases.