Univariate and Simplex Optimization for the Flow-Injection Spectrophotometric Determination of Copper Using Nitroso-R Salt as a Complexing Agent

Purachat, Boonlom; Liawruangrath, Saisunee; Sooksamiti, Ponlayuth; Rattanaphani, Saowanee; Buddhasukh, Duang

doi:10.2116/analsci.17.443

Cited by 29 publications

(13 citation statements)

References 35 publications

(33 reference statements)

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“…The method developed was simple, reliable, high capacity, good stability and fast adsorption and desorption kinetics for determining Zn in water. Also, the proposed method was free of interference compared to conventional procedures to determine Zn [34][35][36][37][38] .The methode can be successfully applied to the separation and determination of Zn in binary mixtures.…”

Section: Resultsmentioning

confidence: 96%

Extraction of Zn(II) Using Magnetic Chitosan Nanoparticles Grafted with B-cyclodextrin and Determination by FAAS

karimnezhad¹,

Moghimi²

2014

Orient. J. Chem

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Section: Resultsmentioning

confidence: 96%

Extraction of Zn(II) Using Magnetic Chitosan Nanoparticles Grafted with B-cyclodextrin and Determination by FAAS

karimnezhad¹,

Moghimi²

2014

Orient. J. Chem

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“…Also, the proposed method was free of interference compared to conventional procedures to determine copper. [50][51][52][53][54] The methode can be successfully applied to the separation and determination of copper in binary mixtures.…”

Section: Resultsmentioning

confidence: 99%

Preconcentration of Copper(II) Using Mesoporous Organo-Silicas and Determination by Flame Atomic Absorption Spectrometry

Moghimi¹

2008

Journal of the Korean Chemical Society

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주제어: 예비농축, 구리, 메조 유기-실리카, 고상 추출, 불꽃원자 흡수분광법(FAAS)ABSTRACT. A simple and reproducible method for the rapid extraction and determination of trace amounts of copper(II) ions using mesoporous organo-silicas mesoporous silica and atomic absorption spectrometry is presented. Common coexisting ions did not interfere with the separation and determination. The preconcentration factor was 100 (1 ml elution volume) for a 100 ml sample volume. The limit of detection of the proposed method is 1.0 ng ml -1. The maximum sorption capacity of sorbent under optimum conditions has been found to be 5mg of copper per gram of sorbent. The relative standard deviation under optimum conditions was 2.8% (n=10). Accuracy and application of the method was estimated by using test samples of natural and synthetic water spiked with different amounts of copper(II) ion.

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“…18 The choice of the open tubular reactors geometrics for FI systems depends on the analytes of interest and the employed chemical reaction. 19,20 It is necessary to optimize the injection volume to obtain the required sensitivity, because the amounts of sample injected into the FI system should be sufficient to permit effective reactions. Therefore, the effect of various injection volumes (50 -200 µL) on the peak signal for diazepam determination was studied.…”

Section: Effect Of the Size And Length Of The Mixing Tubingmentioning

confidence: 99%

A Simple Flow Injection Spectrophotometric Procedure for the Determination of Diazepam in Pharmaceutical Formulation

2006

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Diazepam is an important member of the group of 1,4-benzodiazepine derivatives, which have found extensive use in current therapy. It is used for the symptomatic relief of tension and anxiety, acute alcohol withdrawal, adjunct therapy in skeletal muscle apasms and is preferred by many clinicians for the management of status epilepticus. 1 Nowadays, diazepam is the drug of choice for the control of acute seizures. It is inexpensive, widely available in resourcepoor countries and effective when given by the intravenous or rectal routes. When such drugs are used singly, they appear to be relatively safe, but are of significant pharmacological importance when in the presence of other depressant drugs, such as barbiturates, narcotics and phenothinzines. 2 The wide use of these drugs necessitates a rapid, reliable and sensitive method for their quantitation.Numerous analytical techniques based on gas chromatography, 3 high performance liquid chromatography, 4,5 capillary electrophoresis, 6 TLC-densitometry, polarography, 7 the electrochemical method 8 and spectrophotometry 9 have been developed for determining benzodiazepines in various sample matrices. For examples, Yu et al. 10 described a second-order derivative spectrometric method for diazepam determination in commercial injection. Measurements were made at 343, 339, 335, 323, 319 and 315 nm. The mean recovery (n = 3) of diazepam was 100.3% with a coefficient of variation of 0.6%.A reversed-phase HPLC procedure with UV detection was reported for diazepam determination in plasma samples from children with severe malaria. 11 Liu et al. 12 described an RP-HPLC method for the quantitation of diazepam and its metabolites in dog plasma. A flow injection (FI) fluorometric determination of diazepam and other benzodiazepines in pharmaceutical preparations after hydrolysis was developed. 13 Recently, a derivative UV spectrophotometric method has been proposed for the simultaneous determination of phenylpropanolamine hydrochloride, caffeine and diazepam in tablets. Satisfactory results were obtained and were in good agreement with those obtained by RP-HPLC. 14 A thin-layer chromatographydensitometry technique has been developed for the separation and determination of diazepam and other benzodiazepine derivatives in tablets. 15 TLC-densitometry, although the yield has slightly higher values than the HPLC method, is preferred, owing to its simplicity, ease and low-cost. Salem et al. 16 described spectrophotometric and fluorometric methods for determining diazepam, bromazepam and clonazepam in pharmaceutical and urine samples. The methods are based on measuring the absorption or emission spectra in a methanolic potassium hydroxide solution. Fluorometric methods have proved to be selective with low detection limits (7.13 ng mL -1 ), whereas spectrophotometric methods show relatively high detection limits (1.27 µg ml -1 for diazepam). However, many of such procedures have been criticized as being tedious, time consuming with occasionally suffer from lack of selectivity. Some mod...

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Univariate and Simplex Optimization for the Flow-Injection Spectrophotometric Determination of Copper Using Nitroso-R Salt as a Complexing Agent

Cited by 29 publications

References 35 publications

Extraction of Zn(II) Using Magnetic Chitosan Nanoparticles Grafted with B-cyclodextrin and Determination by FAAS

Extraction of Zn(II) Using Magnetic Chitosan Nanoparticles Grafted with B-cyclodextrin and Determination by FAAS

Preconcentration of Copper(II) Using Mesoporous Organo-Silicas and Determination by Flame Atomic Absorption Spectrometry

A Simple Flow Injection Spectrophotometric Procedure for the Determination of Diazepam in Pharmaceutical Formulation

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