Dry analysis element for the analysis of iron ions

Details Dry analysis element for the analysis of iron ions Dry analysis element for the analysis of iron ions

1991-10-18

1993-02-16

Johnston, Jill A.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

436 74, 436 78, 436 84, 436170, 436175, G01N 3122

Patent

active

051868946

ABSTRACT:
A dry analysis element for the analysis of iron ions, which is improved in selectivity so that iron ions can be analyzed reliably at a high sensitivity without the interferences by the presence of hindering Cu.sup.2+ and/or Zn.sup.2+ ions. The analysis element comprises a detection reagent layer containing Nitro-PAPS acting as a chelating agent and a cationic compound, and a pre-treating layer containing a Cu.sup.2+ -specific chelating agent. The analysis element further includes a pH buffer for keeping the pH value of the detection reagent layer within the range of from pH 3.0 to 5.0. The pH adjusting buffer may be contained in either one of the detection reagent layer or the pre-treating layer, or may be contained in another layer. The detection reagent layer may be composed of a coloring reagent layer containing Nitro-PAPS acting as the chelating agent, and a diffusion-preventing layer laminated on the coloring reagent layer and containing the cationic compound.

REFERENCES:
patent: 4810656 (1989-03-01), Torelli
patent: 5017498 (1991-05-01), Fossati et al.
Chemical Abstracts, vol. 108, No. 15, Apr. 11, 1988, Columbus, Ohio, US. Abstract No. 127912-A Sensitive Direct Colorimetric Assay of Serum Ion Using the Chromogen, Nitro-PAPS-p. 393.
Chemical Abstracts, vol. 114, No. 25, Jun. 24, 1991, Columbus, Ohio, US. Abstract No. 243746-A Sensitive Direct Colorimetric Assay of Serum Zinc Using the Nitro-PAPS and Microwell Plates-p. 414.

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