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A novel method performing for coulometric backtitrations in flow channels was developed, which was applied for the precise and sensitive determination of low concentrations of nitrite. Under acid conditions nitrite is reacting stoichiometrically with hydrazine, the remained excess of which is backtitrated with electrogenerated bromine. The titration course(More)
The interaction of Ru(bipy)2(dppx)2+ (bipy = 2.2'-bipyridine,dppx = 7,8-dimethyldipyrido phenazine) with the calfthymus DNA has been studied with fluorescence and ultraviolet visible absorption spectroscopy. The results of fluorescence quenching and salt effect show that Ru(bipy)2(dppx)2+ intercalate into the double helix of DNA. The ultraviolet visible(More)
A precise and sensitive working microflow titration procedure was developed to determine creatinine and ammonia in urine samples. This procedure is based on enzymatic conversion of creatinine, gas diffusional membrane separation of the released ammonia into an acid acceptor stream, and coulometric titration of ammonia with hypobromite. The hypobromite is(More)
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