Microwave-assisted photochemical digestion of natural waters:: Application in partition and speciation studies of copper

被引：23

作者：

Sodré, FF ^{[1
]}

Peralta-Zamora, PG ^{[1
]}

Grassi, MT ^{[1
]}

机构：

[1] Univ Fed Parana, Dept Quim, BR-81531990 Curitiba, Parana, Brazil

来源：

QUIMICA NOVA | 2004年 / 27卷 / 05期

关键词：

natural water digestion; speciation; partitioning;

D O I：

10.1590/S0100-40422004000500003

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The efficiency of a new procedure for the digestion of natural waters, based on a microwave-activated photochemical reactor was evaluated in this work. Fluorescence spectra showed a 99% reduction in the emission of a 40 mg L-1 humic acid solution after 15 min of UV irradiation. In the presence of H2O2, only 3 min were necessary to accomplish a reduction of almost 100% in the emission and 6 min to reduce the concentration of dissolved organic carbon by 95%. The copper recovery from synthetic samples containing commercial humic acid, from soil suspensions, as well as from natural waters varied between 91.5 and 106.6%. The digestion of dissolved and unfiltered samples was successfully accomplished in 6 and 12 min, respectively. No contaminations or sample losses were observed. Results of copper speciation in natural waters showed that this metal is predominantly bound to natural ligands. Only 3-6% of the total recoverable copper is present in the labile form.

引用

页码：695 / 700

页数：6

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