Determination of Copper by Atomic Absorption Spectrophotometry After Solid-Liquid Separation by Adsorption of its 1-Nitroso-2-Naphthol Complex onto Microcrystalline Benzophenone

Kim, Bokhee; Choi, Hee-Seon

doi:10.1080/00032719908542872

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…In our opinion, it is a good result in comparison even with more complex fluorimetric techniques using sophisticated chemosensors. Although the kinetic method using ascorbic acid oxidation shows higher LOD for Cu 2+ than 20 nM [35], 4.7 nM [36], and 24.5 nM [37] and slightly higher than LOD of inductively coupled plasma-atomic emission spectroscopy (74 nM [54]), this technique is more sensitive than the reported fluorescent ones [38][39][40][41][42][43][44][45][46][47][48], atomic absorption spectroscopy (AAS) [49] (however, preconcentration methods [50][51][52] improves the sensitivity of AAS by 10 times compared to the proposed method) and atomic emission spectroscopy [54]). Another advantage of the proposed method is its probable applicability for determining the equilibrium concentration of copper (II) ions in complex systems containing ligands (including biomacromolecules such as nucleic acids and proteins), i.e., for studying the coordination equilibria and determining the stability constants of Cu 2+ complexes.…”

Section: Quantitative Analysis Of Copper (Ii) Ions Using Ascorbic Aci...mentioning

confidence: 99%

“…and several fluorimetric sensors designed recently (see, e.g., just a few of them in papers [35][36][37][38][39][40][41][42][43][44][45][46][47][48]). However, the relatively low sensitivity and selectivity are the disadvantages of the classic techniques, and a preconcentration of copper (II) is required to achieve the nanomolar limit of detection using atomic absorption spectroscopy [49][50][51][52], while the fluorescent sensors are often difficult to synthesize. Moreover, luminescent probes require a non-aqueous solvent for analytical determination, which limits their applicability.…”

Section: Introductionmentioning

confidence: 99%

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Copper (II)-Catalyzed Oxidation of Ascorbic Acid: Ionic Strength Effect and Analytical Use in Aqueous Solution

Murekhina

Yarullin

Sovina³

et al. 2022

Inorganics

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Copper is an important metal both in living organisms and in the industrial activity of humans, it is also a distributed water pollutant and a toxic agent capable of inducing acute and chronic health disorders. There are several fluorescent chemosensors for copper (II) determination in solutions; however, they are often difficult to synthesize and solvent-sensitive, requiring a non-aqueous medium. The present paper improves the known analytical technique for copper (II) ions, where the linear dependence between the ascorbic acid oxidation rate constant and copper (II) concentration is used. The limits of detection and quantification of the copper (II) analysis kinetic method are determined to be 82 nM and 275 nM, respectively. In addition, the selectivity of the chosen indicator reaction is shown: Cu2+ cations can be quantified in the presence of the 5–20 fold excess of Co2+, Ni2+, and Zn2+ ions. The La3+, Ce3+, and UO22+ ions also do not catalyze the ascorbic acid oxidation reaction. The effect of the concentration of the common background electrolytes is studied, the anomalous influence for chloride-containing salts is observed and discussed.

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Section: Quantitative Analysis Of Copper (Ii) Ions Using Ascorbic Aci...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Copper (II)-Catalyzed Oxidation of Ascorbic Acid: Ionic Strength Effect and Analytical Use in Aqueous Solution

Murekhina

Yarullin

Sovina³

et al. 2022

Inorganics

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“…[8][9][10][11][12] Solid-liquid separation has been usually applicable to binary complexes, but in case of ternary complexes, only some metal ions could be separated. Such a ternary complex was not well formed and was unstable at high temperature.…”

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confidence: 99%

Atomic Spectrophotometric Determination of Iron, Cobalt and Copper after Separation and Preconcentration by Adsorption of Their Ternary Complexes with Nitroso-R Salt and Cetyltrimethylammonium Bromide onto Benzophenone

Choi

2000

ANAL. SCI.

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A liquid-liquid extraction has widely been used as one of the techniques by which trace metal ions in aqueous solution could be separated and concentrated. 1 However, some metal complexes that slightly dissolve in liquid solvent and are stable in solution at high temperature could be concentrated and extracted more effectively, rapidly and quantitatively by solid-liquid separation using microcrystalline naphthalene or benzophenone. 2,3 But this method suffers from the volatility of the fused organic material caused by a high temperature of 70 -90˚C. In order to overcome this difficulty, a modified technique based on the adsorption of metal complex at room temperature onto microcrystalline organic substance was used. 4,5 UV-Vis spectrophotometry has usually been used to determine the analytes after solid-liquid separation. [4][5][6][7][8] In the case of using UV-Vis spectrophotometry, however, the spectral interference due to overlapping of the maximum absorption wavelengths may occur when various metal ions are contained in a real sample. So, the atomic absorption spectrometry that had only slight spectral interference was used in this study.The determination of Fe 3+ , Co 2+ or Cu 2+ has been performed after solid-liquid separation. [8][9][10][11][12] Solid-liquid separation has been usually applicable to binary complexes, but in case of ternary complexes, only some metal ions could be separated. Such a ternary complex was not well formed and was unstable at high temperature. 13One example where such separation was applicable to a ternary complex was Fe 2+ -dipyridyltetraphenylborate. 14 Also, the metal-nitroso-R salt anionic complexes which metal ions were Fe 3+ , Co 2+ and Cu 2+ , were retained on tetradecyldimethylbenzylammonium iodide supported on naphthalene in column. 15 In this study, the determinations of Fe 3+ , Co 2+ and Cu 2+ were performed after separation and adsorption of their ternary complexes with nitroso-R salt and CTAB onto benzophenone at 30˚C. The ternary complexes of Fe 3+ , Co 2+ and Cu 2+ could simultaneously be preconcentrated with excellent efficiency at about room temperature by this technique. And this method was more sensitive, more rapid and had less spectral interference than with UV-Vis spectrophotometry. Experimental InstrumentationA GBC Model 903 flame atomic absorption spectrophotometer was used to determine Fe 3+ , Co 2+ and Cu 2+ . The measuring conditions were as follows: 10 cm 1-slot burner; air(16 l/min)-acetylene(1.5 l/min) flame; 0.5 nm spectral bandwidth; 12 mm burner height. The wavelengths and the lamp currents of Fe 3+ , Co 2+ and Cu 2+ were 248.3 nm, 240.7 nm and 324.8 nm, and 7.0 mA, 6.0 mA and 4.0 mA, respectively.To adjust pHs, a Bantax Model 300A digital pH meter with a combined glass and calomel electrode was used. Reagents and solutionsChemicals such as iron(III) nitrate nonahydrate (Aldrich Co.), cobalt(II) nitrate heptahydrate (Aldrich Co.), copper(II) nitrate hexahydrate (Aldrich Co.), nitroso-R salt (BDH Chemical Co.), benzophenone (Yakuri Co.) and cetylt...

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Solid phase extractive preconcentration of thorium onto 5,7-dichloroquinoline-8-ol modified benzophenone

Preetha

2002

Talanta

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Determination of Copper by Atomic Absorption Spectrophotometry After Solid-Liquid Separation by Adsorption of its 1-Nitroso-2-Naphthol Complex onto Microcrystalline Benzophenone

Cited by 7 publications

References 19 publications

Copper (II)-Catalyzed Oxidation of Ascorbic Acid: Ionic Strength Effect and Analytical Use in Aqueous Solution

Copper (II)-Catalyzed Oxidation of Ascorbic Acid: Ionic Strength Effect and Analytical Use in Aqueous Solution

Atomic Spectrophotometric Determination of Iron, Cobalt and Copper after Separation and Preconcentration by Adsorption of Their Ternary Complexes with Nitroso-R Salt and Cetyltrimethylammonium Bromide onto Benzophenone

Solid phase extractive preconcentration of thorium onto 5,7-dichloroquinoline-8-ol modified benzophenone

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