Pulsed coulometric detection with automatic rejection of...

Details Pulsed coulometric detection with automatic rejection of... Pulsed coulometric detection with automatic rejection of...

G - Physics

01

N

324/27

G01N 27/42 (2006.01)

Patent

CA 1300683

Abstract of the Invention A variation of Pulsed Coulometric Detection (PCD) is described in which the detection potential is scanned in a cyclic fashion during current integration to achieve automatic and virtual elimination of baseline draft caused by surface roughening and changes in pH. The technique is examined at a Au electrode for flow-injec- tion determination if thiourea which is typical of numerous sulfur compounds whose anodic reactions are catalyzed by formation of surface oxide. The baseline decays quickly to a near-zero equilibrium value follow- ing start-up and is unchanged for a pH step of ca. 2 units. The technique is concluded to be compatible with pH-gradient chromatography.

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