Amperometric sensor nitrite

Poly(toluidine blue) electrode was used as a nitrite amperometric sensor [235]. Because this compound also exhibits good electrocatalytic activity toward NO, such a sensor was also developed [170]. The product of the electroreduction of NAD was identified as enzymatically active NADH at poly(neutral red) electrodes, which is a very important recognition regarding the application of PNR electrodes in the study, and the electrochemical regeneration of nicotinamide adenine dinucleotide [236]. 

Santos WJR, Sousa AL, Luz RCS et al (2006) Amperometric sensor for nitrite using a glassy carbon electrode modified with alternating layers of ironflll) tetra-(lV-methyl-4-pyridyl)-porph5oin and cobalt(II) tetrasulfonated phthalocyanine. Talanta 70 588-594... 

Karube I, Okada T, Suzuki S, Suzuki H, Hikuma M, Yasuda T (1982) Amperometric determination of sodium nitrite by a microbial sensor. Eur J Appl Microbiol Biotechn 15 127-132... 

Yang, W. W., Bai, Y., Li, Y. C. and Sun, C. Q. (2005a), Amperometric nitrite sensor based on hemoglobin/colloidal gold nanoparticles immobilized on a glassy carbon electrode by a titania sol-gel film. Anal. Bioanal. Chem., 382(1) 44-50. 

Nitrite Nitrite is an important indicator of fecal pollution in natural waters as well as a potential precursor of carcinogenic species. A rush of flow and sequential injection spectrophotometric method based on Griess-type reactions has been proposed, also coupled to online sorbent enrichment schemes. The catalytic effect of nitrite on the oxidation of various organic species constitutes the basis of fairly sensitive spectrophotometric methods. Fluorometric methods based on the formation of aromatic azoic acid salts, quenching of Rhodamine 6G fluorescence, and direct reaction with substituted tetramine or naphthalene species have been also reported. Indirect CL methods usually involve conversion into nitric oxide and gas-phase detection as mentioned in the foregoing section. The redox reaction between nitrite and iodide in acidic media is the fundamental of a plethora of flow injection methodologies with spectrophotometric, CL, or biamperometric detection. New electrochemical sensors with chemically modified carbon paste electrodes containing ruthenium sites, or platinum electrodes with cellulose or naphthalene films, have recently attracted special attention for amperometric detection. 

Strehlitz, B. Gruendig, B. Schumacher, W. Kroneck, P. M. H. Kotte, H. A nitrite sensor based on a highly sensitive nitrite reductase mediator-coupled amperometric detection. AnaZ. Chem. 1996,68, 807-816. 

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