Eliminasi Interferensi Mangan Dengan Penopengan EDTA Pada Penentuan Nikel Dan Timbal Dalam Pirolusit Dengan Spektrofotometri Serapan Atom

POTE, Lodowik Landi and NADUT, Anggelinus (2023) Eliminasi Interferensi Mangan Dengan Penopengan EDTA Pada Penentuan Nikel Dan Timbal Dalam Pirolusit Dengan Spektrofotometri Serapan Atom. IJCR - Indonesian Journal of Chemical Research, 8 (2). pp. 28-37. ISSN 2614-508

Text Elimination Of Manganese Interference With EDTA Masking In Determination of Nickel and Lead In Pyrolusite Using Atomic Absorption Spectrophotometry.pdf Restricted to Repository staff only Download (211kB)

Abstract

The pyrolusite mineral contains relatively high concentrations of manganese and the trace elements nickel and lead, so analysis of trace elements with SSA often occurs interference due to the presence of main elements with relatively high concentrations. Therefore, this research aims to examine the effect of manganese interference on the absorbance of nickel and lead using Atomic Absorption Spectrophotometry (SSA), overcoming manganese interference with EDTA masking and nickel and lead complexed with sodium diethyl dithiocarbamate in chloroform and analyzed with SSA and concentration analysis. nickel and lead in pyrolusite mineral before and after EDTA masking. Dissolution of pyrolusite samples was carried out by wet digestion using aqueous regia and HF solutions with a ratio of 3:4 (v/v). Interference studies were carried out on the absorbance of nickel and lead with the addition of manganese with varying concentrations of 100-5000 μg/mL measured at a wavelength of 232.0 nm and a gap width of 0.2 nm for nickel and a wavelength of 283.3 nm and a gap width of 0.7 nm for lead. The analysis results show that manganese at a concentration of 100-5000 μg/mL can interfere with the absorbance of nickel and lead, where the absorbance of nickel and lead increases. Recovery results (Recovery) of nickel, lead and manganese with masking 0.10 M EDTA and extracting nickel, lead and manganese into chloroform with sodium diethyl dithiocarbamate complexing at pH 2 obtained nickel (85.39%), lead (92.63%) and manganese (0.00%). nickel and lead pyrolusite samples before extraction with an average nickel and lead content of 1817.82 ± 9.42 μg/g and 122.81 ± 7.60 μg/g. The nickel and lead content after manganese interference was removed by EDTA 0 masking .1 M at pH 2 and complexed with DDC in chloroform obtained an average content of 1571.32 ± 7.54 μg/g for nickel and 87.65 ± 7.53 μg for lead.

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