Determining organic impurities in mother liquors from oxidative terephthalic acid synthesis by microemulsion electrokinetic chromatography

Huang, Hsi‐Ya; Wei, Mercury; Lin, Yu‐Ru; Lu, Pin-Hsuan

doi:10.1016/j.chroma.2009.01.003

Cited by 14 publications

(8 citation statements)

References 14 publications

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“…This compound, the dimethyl ester analogue of trimellitic acid, can be produced by oxidation of xylenes (Huang et al . ) that were also detected in the wastewater.…”

Section: Resultsmentioning

confidence: 93%

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Matrix effects of milk, dairy factory wastewater and soil water on the determination of disinfection by‐products and para‐cresol using solid‐phase microextraction

Heaven

Verheyen

Reynolds

et al. 2013

Int J of Dairy Tech

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Assessing pollutant concentrations can be hampered by the complex matrices found in the dairy supply/processing chain. Matrix effects were examined using solid‐phase microextraction (SPME) used to sample haloacetic acid methyl esters (HAAMe) and para‐cresol. In general, HAAMe were more difficult to detect with a polydimethylsiloxane fibre than with carboxen–polydimethylsiloxane fibre. Headspace sampling generally provided better detection of HAAMe than direct immersion with the reverse true for para‐cresol. For para‐cresol, equivalent ratios up to 18.8 were detected. Other compounds detected included sulphides, VOC's, phenols and indoles. For milk samples, most compounds collected by SPME were found using direct immersion.

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“…This compound, the dimethyl ester analogue of trimellitic acid, can be produced by oxidation of xylenes (Huang et al . ) that were also detected in the wastewater.…”

Section: Resultsmentioning

confidence: 93%

“…In the mixed liquor wastewater sample, the organic acid 1,2,4-benzenetricarboxylic acid 1,2-dimethyl ester was found but only when using CAR-PDMS HS-SPME. This compound, the dimethyl ester analogue of trimellitic acid, can be produced by oxidation of xylenes (Huang et al 2009) that were also detected in the wastewater.…”

Section: Resultsmentioning

confidence: 99%

Matrix effects of milk, dairy factory wastewater and soil water on the determination of disinfection by‐products and para‐cresol using solid‐phase microextraction

Heaven

Verheyen

Reynolds

et al. 2013

Int J of Dairy Tech

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“…Both MEKC and MEEKC were suitable for the separation of these compounds. Meanwhile, esbiothrin , the trace NSAIDs in water sample , and several aromatic acids in the mother liquors produced were all reported to be analyzed by MEEKC. Lately, Lin et al.…”

Section: Applicationsmentioning

confidence: 99%

Twenty‐one years of microemulsion electrokinetic chromatography (1991–2012): A powerful analytical tool

et al. 2013

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Microemulsion electrokinetic chromatography (MEEKC) is a CE separation technique, which utilizes buffered microemulsions as the separation media. In the past two decades, MEEKC has blossomed into a powerful separation technique for the analysis of a wide range of compounds. Pseudostationary phase composition is so critical to successful resolution in EKC, and several variables could be optimized including surfactant/co-surfactant/oil type and concentration, buffer content, and pH value. Additionally, MEEKC coupled with online sample preconcentration approaches could significantly improve the detection sensitivity. This review comprehensively describes the development of MEEKC from the period 1991 to 2012. Areas covered include basic theory, microemulsion composition, improving resolution and enhancing sensitivity methods, detection techniques, and applications of MEEKC.

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“…Generally, pH is optimised between 7 and 9 43, 53, 55, and this results in a high EOF with a fast and efficient separation. However, pH values as high as 12 or as low as 2 may be required 56 depending on the pKa of the analytes under investigation and whether there is a need to eliminate ion‐pair interactions. When employing a low pH, the EOF is suppressed and a negative voltage is applied across the capillary to move the ME droplets through the detector.…”

Section: Operating Parameters In Meekcmentioning

confidence: 99%

“…When employing a low pH, the EOF is suppressed and a negative voltage is applied across the capillary to move the ME droplets through the detector. Low pH running buffers have been used recently for the separation of aromatic acids 56, phenylalanine derivatives 51 and penicillins 32.…”

Section: Operating Parameters In Meekcmentioning

confidence: 99%

Recent developments in the methodology and application of MEEKC

Ryan

McEvoy²,

Donegan

et al. 2010

Electrophoresis

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MEEKC is an electrodriven separation technique that utilises the unique properties of a microemulsion (ME) as a background electrolyte to achieve separation of a diverse range of solutes. MEs are composed of nanometre-sized oil droplets suspended in aqueous buffer, which is commonly referred to as oil-in-water ME. The droplets are stabilised by the presence of both a surfactant and co-surfactant. The use of water-in-oil MEs in MEEKC has also been investigated. This review details the advances in MEEKC-based separations from the period June 2008 - June 2010. Areas covered include online sample concentration, suppressed electroosmosis MEEKC, chiral separations, MEEKC-MS, MEEKC-ICP-MS and ME structure characterisation. The review also includes a fundamental introduction to MEEKC, along with a review of recent applications.

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Determining organic impurities in mother liquors from oxidative terephthalic acid synthesis by microemulsion electrokinetic chromatography

Cited by 14 publications

References 14 publications

Matrix effects of milk, dairy factory wastewater and soil water on the determination of disinfection by‐products and para‐cresol using solid‐phase microextraction

Matrix effects of milk, dairy factory wastewater and soil water on the determination of disinfection by‐products and para‐cresol using solid‐phase microextraction

Twenty‐one years of microemulsion electrokinetic chromatography (1991–2012): A powerful analytical tool

Recent developments in the methodology and application of MEEKC

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