A two step filtration based fluorometric device for continuous measurement of DDT residues is developed. The device which exploits the native fluorescence of DDT can be easily adopted to a commercial spectrofluorometer. The device was tested for its use in measuring DDT contamination in soil, potato peel and orange juice extracts and provides a detection lin 1pIvL
A procedure has been developed for the measurement of ammonia in water. The paper describes the effect of the ammonia concentration on the emission of a fluorescent dye. From a plot of change in fluorescence against ammonia concentration, a linear response is achieved up to 25Oppb, with a detection limit of 8ppb. When subjected to a solution of 5Oppb NH, the device showed 90% recovery of the original signal, within 6 sec. The immobilised form of the fluorophore ensures an interaction with only molecular ammonia (NH3) rather than ammomum ions. Hence the fibre-optic device based on the method reported here is insensitive to pH effects.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.