Design Of Quantitative Hydrogen Peroxide Detector

Hydrogen Peroxide is a strong oxidizer, and only nontoxic water and oxygen are generated after the hydrogen peroxide is decomposed. So the food grade hydrogen peroxide is widely applied in the field of food sterilization. But sometimes the hydrogen peroxide is used as food additive by some unscrupulous traders in order to make the food look better, as well as keep the food fresh. This results in the existence of hydrogen peroxide in foods.Hydrogen peroxide does great damage to human health after entering human body. As a result, detecting the existence of hydrogen peroxide in foods is of importance in the field of food safety. There is a good prospect on the development of portable hydrogen peroxide detector.The embedded system which takes the application as its center is a kind of special computer system. It’s the combination of different technologies such as computer, semiconductor, electronic and various industries. The hardware and software of embedded system could be customized according to the requirement and the reliability, cost, bulk and power consumption all need to be controlled strictly. The portable hydroden detector based on the embedded system adopts a kind of convenient measurement method so that it could help the user measure the concentration of hydrogen peroxide in foods conveniently.Quantitative hydrogen peroxide detectors based on spectrophotometry and electrochemistry were developed. It is used to detect the existence of hydrogen peroxide in foods. Some particular monochromatic light would be emitted by reaction between hydrogen peroxide and horseradish peroxidase. The concentration of hydrogen peroxide could be determined by evaluated the absorbance changes after mixed the sampling solution with the horseradish peroxidase. After the reaction between hydrogen peroxide and the specific reagent on a disposable test strip where a const voltage is applied, a micro-current signal is generated. The concentration of hydrogen peroxide in the sample will be quantitatively determined by the generated current signal. Both hardware and software design of the meter are presented. Testing experiments were carried out to access the accuracy and resolution of the meter.