Automated Method for the Selective Determination of Gold by On-Line Solvent Extraction and Reversed Micellar-Mediated Luminol Chemiluminescence Detection

Fujiwara, Terufumi; Murayama, K.; ImdadullahKumamaru, T.

doi:10.1006/mchj.1994.1027

Cited by 16 publications

(8 citation statements)

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“…Analytical procedures based on the principles of ion-pair formation between a protonated alkaloid and a negatively charged metal-containing species have been developed for the indirect AAS determination of alkaloids. − The feasibility of using AuCl 4 - for the on-line extraction and CL determination of atropine in aqueous media is examined in this paper. The fundamental theory is closely related to the procedure for gold (III) determination based on CL oxidation of luminol with AuCl 4 - in reverse micelles as reported previously. − , The validation of the proposed method is confirmed by applying it to the determination of atropine in synthetic urine samples and of atropine and scopolamine in pharmaceutical preparations. The proposed procedure could be extended to the determination of cocaine.…”

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confidence: 53%

“…Apparatus. The multicomponent instrument, used for the reverse FIA system of on-line continuous extraction, phase separation, and CL detection, was the same (Figure ) as that reported previously . The extraction coil (a 3 m PTFE tube of 0.5 mm i.d.)…”

Section: Methodsmentioning

confidence: 99%

“…Because of the catalytic behavior of different metal ions and the effectiveness of reverse micelles in CL reactions, we used RMM-CL reactions to develop new methods for the off/on-line trace-level quantification of gold(III), − , rhodium(III), iron(III), , iron(II), and vanadium(IV). , Most probably via an ion-pair formation in the extraction process, gold(III) was transferred as the tetrachloroaurate ion from aqueous solution into chloroform containing tri- n -octylphosphine oxide . The postextraction step was directly coupled to an RMM-CL detection system, and the resulting solvent extraction/RMM-CL hybrid method was then applied to the determination of gold in industrial samples. , …”

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confidence: 99%

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Solvent Extraction Coupled On-Line to a Reversed Micellar Mediated Chemiluminescence Detection System for Trace-Level Determination of Atropine

et al. 2000

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A fast and sensitive method for the determination of atropine, an alkaloid closely related to cocaine, is proposed. The principles of on-line ion-pair formation of alkaloid-metal complexes and liquid-liquid extraction are applied to the chemiluminescence determination of atropine. On mixing with a reversed micellar medium of cetyltrimethylammonium chloride in dichloromethane-cyclohexane (1:1 v/v)-water (0.3 M Na2CO3) containing luminol, the ion-pair complex of tetrachloroaurate(III) with atropinium produced an analytical chemiluminescence signal when it entered the reversed micellar water pool. Using the reverse-flow injection and chemical conditions optimized for atropine in aqueous samples, a detection limit of 1 ng/mL was achieved and a linear calibration graph was obtained with a wide dynamic range from 10 ng/mL to 100 micrograms/mL. The proposed method is simple and provides a good precision with a relative standard deviation (n = 6) of ca. 3% at the atropine concentration of 100 ng/mL. After a preliminary study involving the potential interference from species of organic, inorganic, and metallic nature, the method was applied to the determination of atropine in artificial urine samples and of atropine and scopolamine in pharmaceutical formulations.

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confidence: 53%

Section: Methodsmentioning

confidence: 99%

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Solvent Extraction Coupled On-Line to a Reversed Micellar Mediated Chemiluminescence Detection System for Trace-Level Determination of Atropine

et al. 2000

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“…Chemiluminescence (CL) has been established as a valuable detection technique offering low detection limits, wide linear range, high analytical throughput and simple instrumentation 36 37 . Tsogas et al recently reported a method for the ultratrace determination of silver, gold, and iron oxide nanoparticles involving chemiluminescence detection 34 .…”

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confidence: 99%

Simultaneous Determination of Size and Quantification of Gold Nanoparticles by Direct Coupling Thin layer Chromatography with Catalyzed Luminol Chemiluminescence

Yan

Zhu

et al. 2016

Sci Rep

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The increasing use of metal-based nanoparticle products has raised concerns in particular for the aquatic environment and thus the quantification of such nanomaterials released from products should be determined to assess their environmental risks. In this study, a simple, rapid and sensitive method for the determination of size and mass concentration of gold nanoparticles (AuNPs) in aqueous suspension was established by direct coupling of thin layer chromatography (TLC) with catalyzed luminol-H2O2 chemiluminescence (CL) detection. For this purpose, a moving stage was constructed to scan the chemiluminescence signal from TLC separated AuNPs. The proposed TLC-CL method allows the quantification of differently sized AuNPs (13 nm, 41 nm and 100 nm) contained in a mixture. Various experimental parameters affecting the characterization of AuNPs, such as the concentration of H2O2, the concentration and pH of the luminol solution, and the size of the spectrometer aperture were investigated. Under optimal conditions, the detection limits for AuNP size fractions of 13 nm, 41 nm and 100 nm were 38.4 μg L−1, 35.9 μg L−1 and 39.6 μg L−1, with repeatabilities (RSD, n = 7) of 7.3%, 6.9% and 8.1% respectively for 10 mg L−1 samples. The proposed method was successfully applied to the characterization of AuNP size and concentration in aqueous test samples.

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“…Various sample pretreatment processes may be coupled with the FIA system. Examples are solvent-solvent extraction [ 23 , 24 ], sample clean-up such as filter and dialysis [ 25 – 31 ], digestion [ 32 ], dilution [ 33 ], and preconcentration [ 34 – 36 ]. The technique so called bead injection, in which active microbeads are used as solid surface to accommodate chemical reaction or to selectively trap/separate and accumulate analyte of interest from sample matrices, has provided for more applications [ 37 – 39 ].…”

Section: Flow-based Analysis Systemsmentioning

confidence: 99%

Flow-Based Systems for Rapid and High-Precision Enzyme Kinetics Studies

Hartwell

Grudpan

2012

Journal of Analytical Methods in Chemistry

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Enzyme kinetics studies normally focus on the initial rate of enzymatic reaction. However, the manual operation of steps of the conventional enzyme kinetics method has some drawbacks. Errors can result from the imprecise time control and time necessary for manual changing the reaction cuvettes into and out of the detector. By using the automatic flow-based analytical systems, enzyme kinetics studies can be carried out at real-time initial rate avoiding the potential errors inherent in manual operation. Flow-based systems have been developed to provide rapid, low-volume, and high-precision analyses that effectively replace the many tedious and high volume requirements of conventional wet chemistry analyses. This article presents various arrangements of flow-based techniques and their potential use in future enzyme kinetics applications.

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Automated Method for the Selective Determination of Gold by On-Line Solvent Extraction and Reversed Micellar-Mediated Luminol Chemiluminescence Detection

Cited by 16 publications

References 0 publications

Solvent Extraction Coupled On-Line to a Reversed Micellar Mediated Chemiluminescence Detection System for Trace-Level Determination of Atropine

Solvent Extraction Coupled On-Line to a Reversed Micellar Mediated Chemiluminescence Detection System for Trace-Level Determination of Atropine

Simultaneous Determination of Size and Quantification of Gold Nanoparticles by Direct Coupling Thin layer Chromatography with Catalyzed Luminol Chemiluminescence

Flow-Based Systems for Rapid and High-Precision Enzyme Kinetics Studies

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