A chemiluminescence sensor for the determination of hydrogen peroxide.

A chemiluminescence one-shot sensor for hydrogen peroxide is described. It is prepared by immobilization of cobalt chloride and sodium lauryl sulphate in hydroxyethyl cellulose matrix cast on a microscope cover glass. Luminol, sodium phosphate and the sample are mixed before use and applied on the membrane by a micropipette. The calibration graph is linear in the range 20-1600mug/L, and the detection limit of the method (3sigma) is 9mug/L. A relative standard deviation of 4.5% was obtained for 100mug/L H(2)O(2) (n=11). The sensor has been applied successfully to the determination of hydrogen peroxide in rainwater.

(Bio)sensors based on manganese dioxide-modified carbon substrates: retrospections, further improvements and applications.

An overview is presented which summarizes our accomplishment in the development of sensors and biosensors based on heterogenous carbon electrodes modified with manganese dioxide. Brief account of each sensor and biosensor has been given and example of real sample applications provided where appropriate.