Simultaneous spectrophotometric determination of Cu(II), Co(II) and Ni(II) using ratio spectra-continuous wavelet transformation in some food and environmental samples

Abstract

A razão entre o espectro contínuo e a transformada "wavelet" foi usada para a determinação simultânea de misturas ternárias de cobre, cobalto e níquel sem separação prévia. O método é baseado na reação de complexação destes cátions com 1-(2-piridilazo)-2-naftol (PAN) em meio micelar triton X-100, pH 8,0. Os resultados mostraram que Cu(II), Co(II) e Ni(II) foram determinados simultaneamente nos intervalos de concentração de 0,20-4,0, 0,20-4,0 e 0,50-7,0 mg L -1 , respectivamente. Foram selecionadas diferentes wavelets-mãe, da família das transformadas wavelet no contínuo, e aplicadas sob condições ótimas nas determinações multi-componentes. O método foi testado pela análise de várias misturas ternárias sintéticas de íons Cu(II), Co(II) e Ni(II). Usando as condições otimizadas, o método proposto foi aplicado com sucesso na determinação simultânea destes metais em algumas amostras reais incluindo comprimidos multivitamínicos, chá, cevada, espinafre, leite em pó, solo, água do mar e amostras de água de torneira.Ratio spectra-continuous wavelet transformation was used for the simultaneous determination of ternary mixtures of copper, cobalt and nickel without prior separation steps. The method is based on the complexation reaction of these cations with 1-(2-pyridylazo)-2-naphthol (PAN) in triton X-100 micellar media at pH 8.0. The results showed that Cu(II), Co(II) and Ni(II) could be determined simultaneously in the ranges 0.20-4.0, 0.20-4.0 and 0.50-7.0 mg L -1 , respectively. Different mother wavelets from the family of continuous wavelet transforms were selected and applied under the optimal conditions for multi-component determinations. The method was tested by analyzing various synthetic ternary mixtures of Cu(II), Co(II) and Ni(II) ions. Under the working conditions, the proposed method was successfully applied for the simultaneous determination of these metals content evaluation in some real samples including multivitamin tablet, tea, barley, spinach, chocolate, milk powder, soil, sea water and tap water samples.

Mean Centered Kinetic—Spectrophotometric Data—Continuous Wavelet Transform for Simultaneous Determination of Dopamine and Uric Acid in Presence of Ascorbic Acid at Biological Samples

“…So, the wavelets provide a new conception of a signal. WT is very effective for eliminating or reducing of baseline effect and noise of data, data compression, recognition and detection of latent transient information [24,28]. The combination of continuous wavelet transforms (CWT) and zero crossing technique has been adjusted for the simultaneous determination of different binary and ternary mixtures [29][30][31][32][33][34][35].…”

Ultrasound-assisted emulsification–microextraction and spectrophotometric determination of cobalt, nickel and copper after optimization based on Box-Behnken design and chemometrics methods

“…Nowadays quantitative spectrophotometry has been greatly improved by the use of a variety of multivariate statistical methods, particularly partial least squares regression (PLS). It has been shown that PLS is a reasonable choice for the resolution of overlapping signals and quantitative analysis over a wide range of conditions [23][24][25][26] .…”

Separation and In Situ Cocrystallization of C-Ethylresorcin[6]arenes with 1-(2-Pyridylazo)-2-naphthol

“…The process of cocrystallization is supramolecular self-assembly in nature, where all component molecules arrange themselves spontaneously via noncovalent interactions . Organic components are used for cocrystallization with 6-RsC2 is 1-(2-pyridylazo)-2 naphthol (PAN) (Scheme ), which is also an indicator used to determine the presence of specific metals, such as copper, zinc, and nickle. , Atwood et al. previously synthesized cocrystals from PAN and C -alkylpyrogallol­[4]­arenes (PgCs) with different C -alkyl chain lengths to study intermolecular interactions between components of cocrystals .…”

“…25 Organic components are used for cocrystallization with 6-RsC2 is 1-(2-pyridylazo)-2 naphthol (PAN) (Scheme 1), which is also an indicator used to determine the presence of specific metals, such as copper, zinc, and nickle. 26,27 Atwood et al previously synthesized cocrystals from PAN and C-alkylpyrogallol [4]arenes (PgCs) with different C-alkyl chain lengths to study intermolecular interactions between components of cocrystals. 28 Resorcin [4]arene and pyrogallol [4]arene have similar molecular structures, with only a variation of the number of hydroxyl groups on the upper rim of bowl shaped macrocycles.…”