Optimization of Dispersive Liquid–Liquid Microextraction of Irganox 1010 and Irgafos 168 from Polyolefins Before Liquid Chromatographic Analysis

Farajzadeh, Mir Ali; Vardast, Mohammad Reza; Bahram, Morteza

doi:10.1365/s10337-008-0912-z

Cited by 35 publications

(14 citation statements)

References 19 publications

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“…However, for small data sets, it is very likely that every data point is influential. In these cases, a high value for R 2 for prediction cannot be expected [30].…”

Section: Experimental Designmentioning

confidence: 96%

“…On the other hand, R 2 , R 2 adjusted and R 2 predicted can be used to evaluate model fitness [30,32]. The significant coefficients are listed in Table 5 as coded value modeling.…”

Section: Experimental Designmentioning

confidence: 99%

“…This method is simple, rapid and efficient and high-enrichment factors (EFs) and recoveries (Rs) are attainable. DLLME has been used for preconcentration of copper [23], organophosphorus compound [24,25], preconcentration and determination of trace metals in water samples [26][27][28] and preconcentration of polymer additives from aqueous samples, followed by their analysis by HPLC [29,30].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of dispersive liquid–liquid microextraction of Co(II) and Fe(III) as their oxinate chelates and analysis by HPLC: Application for the simultaneous determination of Co(II) and Fe(III) in water samples

Farajzadeh

Bahram

Vardast

2009

J of Separation Science

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In this study, dispersive liquid-liquid microextraction method was used for the preconcentration and simultaneous determination of Co(II) and Fe(III) in water samples as their oxinate chelates. In dispersive liquid-liquid microextraction process, methanol and chloroform were used as disperser and extracting solvents, respectively, and the ligand 8-hydroxy quinoline was used as a chelating agent for the extraction of Co(II) and Fe(III). HPLC was applied for the quantitation of the analytes after preconcentration. An experimental design, central composite design, coupled with response surface methodology was used for the optimization of the involved experimental parameters. In addition, the effect of various experimental parameters in the extraction was investigated using one variable at a time method. The calibration graphs were linear in the range of 20-4000 mg/L with the LODs of 3 mg/L for both analytes. The RSDs for six replicate measurements of 500 mg/L of Co 21 and Fe 31 were 3.3 and 4.1%, respectively.

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“…However, for small data sets, it is very likely that every data point is influential. In these cases, a high value for R 2 for prediction cannot be expected [30].…”

Section: Experimental Designmentioning

confidence: 96%

“…On the other hand, R 2 , R 2 adjusted and R 2 predicted can be used to evaluate model fitness [30,32]. The significant coefficients are listed in Table 5 as coded value modeling.…”

Section: Experimental Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of dispersive liquid–liquid microextraction of Co(II) and Fe(III) as their oxinate chelates and analysis by HPLC: Application for the simultaneous determination of Co(II) and Fe(III) in water samples

Farajzadeh

Bahram

Vardast

2009

J of Separation Science

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“…Some sample preconcentration procedures were applied for the pretreatment of BPA-containing samples, such as, single-drop liquid-phase microextraction (SDME) [6], solid-phase extraction (SPE) [7][8][9], liquid-liquid extraction (LLE) [10], stir bar sorptive extraction (SBSE) [11], solid-phase microextraction (SPME) [12,13], liquid-phase microextraction (LPME) [14], and molecularly imprinted solid-phase extraction (MISPE) [15,16]. Recently, a new microextraction method, named dispersive liquid-liquid microextraction (DLLME), introduced by Assadi et al [17], has been used as a powerful preconcentration technique for extraction of verity compounds including BPA [18][19][20][21][22][23][24][25][26][27]. One of the main disadvantages associated with DLLME, however, is that it uses toxic extraction solvents.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of alcoholic-assisted dispersive liquid-liquid microextraction of bisphenol a in water samples using an experimental design

Fatemi

Hadjmohammadi

Shakeri

2014

Acta Chromatographica

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Summary. Alcoholic-assisted dispersive liquid-liquid microextraction method (AA-DLLME) is used for the extraction, purification, and determination of bisphenol A in water samples by HPLC-UV. 1-octanol and methanol were selected as extraction and dispersive solvents of AA-DLLME procedure. The effects of several parameters of the AA-DLLME procedure (such as volume of extraction and dispersive solvents, amount of salt in sample solution, and extraction time) were investigated by a full factorial design. Then, the levels of significant factors were optimized using a central composite facecentered. The optimum conditions were obtained at 158 μL of extraction solvent, 500 μL of dispersive solvent, 1 min extraction time, and addition of 22% (w/v) of NaCl to the sample solution. Under optimum condition, the extraction recovery and the enrichment factor were determined, which were 91% and 65%, respectively. At these conditions, the limit of detection and the linearity were 0.10 and 1-100 μg L −1 , respectively. The relative standard deviations for intra-and inter-day of extraction of bisphenol A (BPA) were 6.98% and 9.80%, respectively (for five measurements). Finally, the method was successfully applied for the determination of BPA in environmental water samples. In conclusion, it can be stated that the applied method is fast, simple, and environmentally friendly.

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“…Em DLLME, o tempo de extração é definido como o intervalo entre a injeção da solução de extração (SE/SD) e o começo da centrifugação (REZAEE et al, 2006). Inúmeros trabalhos da literatura mostram claramente que está variável é estatisticamente desprezível para a DLLME (SUNA; SHIA; CHENA, 2011;CAMPILLO et al, 2011;JÖNSSON, 2007;WEI;WANG, 2007;VARDAST;BAHRAM, 2009;FARHADI;MATIN;HASHEMI, 2009;PANG;XIAO, 2009;CHEN et al, 2009;CHEN et al, 2008;WU et al, 2009), portanto a influência do tempo sobre a eficiência da extração não foi avaliada. Assim, imediatamente após a injeção da solução de extração foi feita a centrifugação.…”

Section: Tempo De Extração E Centrifugaçãounclassified

Avaliação de técnicas miniaturizadas de preparação de amostras na análise enantiosseletiva de fármacos quirais com diferentes características ácido-base em meio microssomal e aplicação em estudos de metabolismo in vitro

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Optimization of Dispersive Liquid–Liquid Microextraction of Irganox 1010 and Irgafos 168 from Polyolefins Before Liquid Chromatographic Analysis

Cited by 35 publications

References 19 publications

Optimization of dispersive liquid–liquid microextraction of Co(II) and Fe(III) as their oxinate chelates and analysis by HPLC: Application for the simultaneous determination of Co(II) and Fe(III) in water samples

Optimization of dispersive liquid–liquid microextraction of Co(II) and Fe(III) as their oxinate chelates and analysis by HPLC: Application for the simultaneous determination of Co(II) and Fe(III) in water samples

Evaluation of alcoholic-assisted dispersive liquid-liquid microextraction of bisphenol a in water samples using an experimental design

Avaliação de técnicas miniaturizadas de preparação de amostras na análise enantiosseletiva de fármacos quirais com diferentes características ácido-base em meio microssomal e aplicação em estudos de metabolismo in vitro

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