SPECTROPHOTOMETRIC DETERMINATION OF Cu(II), Co(II) AND Ni(II) IONS IN MONO AND MULTI-COMPONENT SYSTEMS
Journal Title: BULETINUL INSTITUTULUI POLITEHNIC DIN IASI, CHIMIE SI INGINERIE CHIMICA - Year 2016, Vol 62, Issue 2
Abstract
The selective determination of Cu(II), Co(II) and Ni(II) ions from aqueous solution was spectrophotmetrically investigated using rubeanic acid as color reagent. The reaction between Cu(II), Co(II) and Ni(II) ions with rubeanic acid occurs rapidly at pH 3.5 in case of Cu(II) ions and at pH 9.0 in case of Co(II) and Ni(II) ions (buffered solutions). The metal complexes have absorption maximums at different wavelength (380 nm for Cu(II), 480 nm for Co(II) and 590 nm for Ni(II), respectively) and this characteristic underlies the possibility of their determination in multi-components systems. This method allows the determination of these metal ions in a relatively wide concentration range, with acceptable detection limits. The interferences caused by each metal ion in the determination of the other were evaluated on the basis of the selectivity coefficients. The validation of Cu(II), Co(II) and Ni(II) determination through this method was done by recovery tests of metal ions in tap water. The obtained results shows that this spectrophotometric method can be successfully used for the analysis of Cu(II), Co(II) and Ni(II) ions in water samples, whether are in mono- or multi-components systems
Authors and Affiliations
VLADISLAV FORNEA, ŞTEFAN TRUPINĂ, ALEXANDRU VASILICĂ IOSUB, LAURA BULGARIU
Keywords
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