Sorption-Catalytic Determination of Manganese Directly on a Paper-Based Chelating Sorbentстатья
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Дата последнего поиска статьи во внешних источниках: 12 октября 2013 г.
Аннотация:A hybrid technique based on a catalytic reaction carried
out on the surface of a paper-based sorbent is proposed.
It is shown that Mn(II) 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 5·10-6 mg/L (as
compared with 6·10-5 mg/L in solution) and expands
the linear range by an order of magnitude (to 5·10-6
– 2.5·10-3 mg/L). The precision of manganese
determination on the sorbent is high (the RSDs are <5%
for >6·10-4 microg 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.