Pulsed coulometric detection with automatic rejection of backgro

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

1988-09-26

1990-07-10

Kaplan, G. L.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

204402, G01N 2742, G01N 3062

Patent

active

049399241

ABSTRACT:
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 drift caused by surface roughening and changes in pH. The technique is examined at a Au electrode for flow-injection 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 following 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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