Selective Kinetic Determination of Cu2+ with Tetraazamacrocyclic Bis(Methylphosphonate) Ligand (Dipon) |
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Authors: | Ivona Svobodová Přemysl Lubal Petr Hermann Jan Kotek Josef Havel |
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Institution: | (1) Department of Analytical Chemistry, Faculty of Science, Masaryk University, Kotláská 2, CZ-611 37 Brno, Czech Republic;(2) Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, CZ-128 40 Prague, Czech Republic |
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Abstract: | A new macrocyclic ligand, 1,4,8,11-tetraazacyclotetradecane-1,8-bis(methylphosphonic acid) (refered to as dipon) exhibits high thermodynamic and kinetic selectivity for Cu2+ compared to other transition metal ions. The initial-rate method (=310nm, pH=3.75, cL4.6×10–3molL–1) was chosen as an optimal experimental approach in order to achieve maximum sensitivity of determination. The dynamic range of the method is (5–200)×10–6molL–1, and the detection limit is 2.5×10–6molL–1. A standard addition procedure was applied to the kinetic determination of Cu2+ to eliminate the effect of interfering ions (e.g. Zn2+, Ca2+, Mg2+, Cd2+, Pb2+, Mn2+, Co2+, Ni2+, HCO–3, Cl–, SO42–, etc.). The method was tested on artificial and real samples (alloys, pure and spiked mineral water) and gave satisfactory results which are in agreement with the values for some certified materials. The advantage of the proposed method is rapidity, simplicity and robustness in the presence of other metal ions. |
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Keywords: | : Copper(II) kinetic determination macrocyclic ligand phosphonate ligand UV/VIS spectrophotometry cyclam derivative |
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