Issue 10, 1997

Sorption–Catalytic Determination of Manganese Directly on a Paper-based Chelating Sorbent

Abstract

A hybrid technique based on a catalytic reaction carried out on the surface of a paper-based sorbent is proposed. It is shown that MnII exhibits its catalytic action in the oxidation of 3,3′,5,5′-tetramethylbenzidine with periodate in aqueous solution as well as on filter-paper with or without attached diethylenetriaminetetraacetate (DETATA) groups. Optimum conditions differ for the reaction in solution and on filter-paper. For equal catalyst concentrations, higher initial reaction rates are attainable on the filter-papers. Preconcentration of manganese on the DETATA sorbent combined with the subsequent catalytic reaction improves the selectivity, reduces the limit of determination down to 5 × 106 mg l1 (as compared with 6 × 105 mg l1 in solution) and expands the linear range by an order of magnitude (to 5 × 106–2.5 × 103 mg l1). The precision of manganese determination on the sorbent is high (the RSDs are ≤5% for ≥6 × 104 µg Mn). Samples of tap and river water were analyzed by use of the proposed sorption–catalytic technique. A rapid procedure for the determination of manganese with visual detection was also developed.

Article information

Article type
Paper

Analyst, 1997,122, 1161-1166

Sorption–Catalytic Determination of Manganese Directly on a Paper-based Chelating Sorbent

M. K. Beklemishev and T. A. Stoyan, Analyst, 1997, 122, 1161 DOI: 10.1039/A702595E

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