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14.
Flotation preconcentration of copper and iron by cobalt(III)
tetramethylenedithiocarbamate from fresh water and their
determination by atomic absorption spectrometry
Vangelica Enimiteva, Trajče Stafilov*, Katarina Čundeva
Institute of Chemistry, Faculty of Science, Sts. Cyril and Methodius
University, P.O. Box 162, 1000 Skopje, Macedonia; *Corresponding
author Fax: +389 2 3226 865; e-mail:
trajcest@iunona.pmf.ukim.edu.mk
Abstract:
A new
flotation method for separation and preconcentration of copper
and iron in traces from aquatic matrix was investigated. The
chelate cobalt(III) tetramethileneditiocarbamate, Co(ТMDTC)3,
was used as a collector of trace elements. The important
parameters necessary for the successful flotation of two
analytes tested determined in 0.5 L solutions were: pH of the
medium (6.0), mass of cobalt (3.5 mg), amount of used
dithiocarbamate (0.4 mmol), type of surfactant (sodium
dodecylsulfate, NaDDS) etc. After flotation preconcentration,
atomic absorption spectrometry (AAS) was used for determination
of analytes. The new developed method was tested and verified by
the method of standards additions and by its application to the
water reference standard material. The ETAAS limit of detection
for copper was 0.0045 µg L−1, while for iron was 0.62
µg L−1.
Key words: Flotation, copper; iron; flotation; cobalt(III)
tetramethylenedithiocarbamate; Zeeman ETAAS; flame AAS
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