Rapid Determination of Anionic Surfactants by Improved Spectrophotometric Method Using Methylene Blue

Koga, Minoru; Yamamichi, Yasushi; Nomoto, Yasuyo; Irie, Maki; Tanimura, Toshifumi; Yoshinaga, Tetsutaro

doi:10.2116/analsci.15.563

Cited by 79 publications

(54 citation statements)

References 7 publications

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“…The equilibrium between SDS, MB and the distribution of SDS-MB ion-pairs in water and chloroform has been qualitatively reported in the literature [14]. The AS dissolved in water are slightly soluble in chloroform.…”

Section: Reaction Of Sds and Mbmentioning

confidence: 81%

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Development and evaluation of a dispersive liquid-liquid microextraction based test method for quantitation of total anionic surfactants: advantages against reference methods

Bidari

Norouzi²

2010

Open Chemistry

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Abstract:A small-scale, simple, and rapid dispersive liquid-liquid microextraction (DLLME) procedure in combination with fiber optic-linear array detection spectrophotometry (FO-LADS) with charge-coupled device (CCD) detector has been developed, with benefits from the use of a micro-cell. The official reference methods (ASTM D2330 -02, ISO 7875-1), which require tedious procedures, were replaced with a modified method. The new method provides a major reduction in sample size, elimination of the use of expensive glassware, and a decrease in the quantity of chloroform used, as well as increased sensitivity. Our method requires only one twentieth of the sample (5.0 mL), and less than one three-hundredth of microextraction solvent (chloroform = 138 µL). It provides a faster analysis time than official analytical methods (less than one minute). The calibration curve was linear in the range of 6 -80 µg g L −1 of sodium dodecyl sulfate (SDS) with a correlation coefficient (r) of better than 0.99 and the LOD was 2 µg L −1 . The repeatability of the proposed method (n=7) was found to be 4.5% and 3.6% for the concentrations of 0.03 and 0.07 mg L −1 , respectively. The enrichment factor was found to be 75 for SDS.

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Section: Reaction Of Sds and Mbmentioning

confidence: 81%

“…This modification to the standard method involves the use of 50 mL of water and 5 mL chloroform, and provides a 6-fold increase in laboratory productivity [14]. Another simplified method that reduces the quantities of reagent by using a certain kind of adsorbent has been proposed [15].…”

Section: Apparatus and Instrumentation Setupmentioning

confidence: 99%

Development and evaluation of a dispersive liquid-liquid microextraction based test method for quantitation of total anionic surfactants: advantages against reference methods

Bidari

Norouzi²

2010

Open Chemistry

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“…However, the tendency of surfactants to concentrate at phase boundaries leads to the formation of emulsions, and phase separation during LLE becomes very difficult. This can be avoided by the formation of liphopilic ion pairs between surfactants and ion-pair reagents [1] (e.g., disulphine blue dyes or LAS for cationic surfactants [65,77,82], methylene blue [78,79,83] or methylene green for anionic surfactants [84], modified Dragendorff reagent for non-ionic [81]). …”

Section: Purification and Preconcentrationmentioning

confidence: 99%

Analysis of Surfactants in Environmental Samples by Chromatographic Techniques

Traverso-Soto¹,

González-Mazo²,

Lara-Martín³

2012

Chromatography - The Most Versatile Method of Chemical Analysis

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“…In subsequent analyses, filters were removed from the cassettes and extracted in 5 ml distilled/deionized (DI) water/filter by sonication at room temperature for 30 min. CE mass was assessed by analysis of dioctyl sulfosuccinate sodium salt (DOS; Sigma Chemical, St. Louis, MO) using a modification of the acidified methylene blue spectrophotometric method for anionic surfactants (Koga et al 1999). Filter extracts were diluted 1:10 with DI water, and 1 ml diluted extract was transferred to a 15-ml silanated glass centrifuge tube.…”

Section: Measurement Of Chamber Corexit Ec9500a Concentration During mentioning

confidence: 99%

A Computer-Controlled Whole-Body Inhalation Exposure System for the Oil Dispersant COREXIT EC9500A

Goldsmith

McKinney

Jackson

et al. 2011

Journal of Toxicology and Environmental Health, Part A

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An automated whole-body inhalation exposure system capable of exposing 12 individually housed rats was designed to examine the potential adverse health effects of the oil dispersant COREXIT EC9500A, used extensively during the Deepwater Horizon oil spill. A computer-controlled syringe pump injected the COREXIT EC9500A into an atomizer where droplets and vapor were formed and mixed with diluent air. The aerosolized COREXIT EC9500A was passed into a customized exposure chamber where a calibrated light-scattering instrument estimated the realtime particle mass concentration of the aerosol in the chamber. Software feedback loops controlled the chamber aerosol concentration and pressure throughout each exposure. The particle size distribution of the dispersant aerosol was measured and shown to have a count median aerodynamic diameter of 285 nm with a geometric standard deviation of 1.7. The total chamber concentration (particulate + vapor) was determined using a modification of the acidified methylene blue spectrophotometric assay for anionic surfactants. Tests were conducted to show the effectiveness of closed loop control of chamber concentration and to verify chamber concentration homogeneity. Five automated 5-h animal exposures were performed that produced controlled and consistent COREXIT EC9500A concentrations (27.1 ± 2.9 mg/m 3 , mean ± SD).

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Rapid Determination of Anionic Surfactants by Improved Spectrophotometric Method Using Methylene Blue

Cited by 79 publications

References 7 publications

Development and evaluation of a dispersive liquid-liquid microextraction based test method for quantitation of total anionic surfactants: advantages against reference methods

Development and evaluation of a dispersive liquid-liquid microextraction based test method for quantitation of total anionic surfactants: advantages against reference methods

Analysis of Surfactants in Environmental Samples by Chromatographic Techniques

A Computer-Controlled Whole-Body Inhalation Exposure System for the Oil Dispersant COREXIT EC9500A

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