Separation of congo red by surfactant mediated cloud point extraction

Purkait, Mihir Kumar; Vijay, Sandip; DasGupta, Sunando; De, Sirshendu

doi:10.1016/j.dyepig.2004.01.010

Cited by 85 publications

(36 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Available electrolytes can also change the cloud point temperatures of non-ionic surfactant. The relevant electrolytes are usually in high concentrations (exceeding 0.1 M) [24]. The salting-in and salting-out effects can be used to interpret the electrolyte effects on the cloud points of non-ionic surfactant [25].…”

Section: Effect Of Concentration Of Na 2 Somentioning

confidence: 99%

Determination of estrogens in water by HPLC–UV using cloud point extraction

Wang

Cai

et al. 2006

Talanta

135

View full text Add to dashboard Cite

A method based on cloud point extraction was developed to determine four kinds of estrogens: estriol (E3), estradiol (E2), estrone (E1), and progesterone (P) in water by high performance liquid chromatography separation and ultraviolet detection (HPLC-UV). The non-ionic surfactant Triton X-114 was chosen as extractant solvent. The parameters affecting extraction efficiency, such as concentrations of Triton X-114 and Na 2 SO 4 , equilibration temperature, equilibration time and centrifugation time were evaluated and optimized. Under the optimum conditions, preconcentration factors of 99 for E3, 73 for E2, 152 for E1 and 86 for P were obtained for 10 mL water sample. The detection of limitation was 0.23 ng mL −1 for E3, 0.32 ng mL −1 for E2, 0.25 ng mL −1 for E1 and 5.0 ng mL −1 for P. The proposed method was successfully applied to the determination of trace amount of estrogens in wastewater treatment plant (WWTP) effluent water and exposure water with 10 ng mL −1 E2 for toxicological study in our lab. For the case of WWTP effluent water samples, no estrogen was found. The accuracy of the proposed method was tested by recovery measurements of spiked samples and good recoveries of 81.2-99.5% were obtained.

show abstract

Section: Effect Of Concentration Of Na 2 Somentioning

confidence: 99%

Determination of estrogens in water by HPLC–UV using cloud point extraction

Wang

Cai

et al. 2006

Talanta

135

View full text Add to dashboard Cite

show abstract

“…This two-aqueous phase extraction process was initially applied to the separation of metals ions, in the presence of a chelating agent [6]. Later on, this process was done on the extraction of many other chemical species, such as various metal ions, small organic molecules and molecules of biological interest [3,[7][8][9][10][11][12][13][14]. In this work, the extraction of phenol and benzyl alcohol from their aqueous solutions was investigated.…”

Section: Introductionmentioning

confidence: 99%

Cloud point extraction of phenol and benzyl alcohol from aqueous stream

Haddou

Canselier

Gourdon

2006

Separation and Purification Technology

View full text Add to dashboard Cite

Two-aqueous phase extraction of phenol and benzyl alcohol as a solute from their aqueous solutions was investigated using polyethoxylated alcohols (CiEj) as a biodegradable non-ionic surfactant. First, the phase diagrams of the binary systems, water-surfactant (Oxo-C 10 E 3 and Oxo-C 13 E 9 ), and the pseudo-binary systems, water-surfactant with a constant concentration of solute was determined. The effect of sodium chloride and sodium sulphate on water-surfactant systems were studied. According to the given surfactants concentrations and temperatures, the extraction results were expressed by the following four parameters, percentage of extracted solute, E, which reached 95 and 90% for phenol and benzyl alcohol, respectively, residual concentrations of solute, X s,w , and the surfactant, X t,w , in the dilute phase and volume fraction of the coacervate at the equilibrium condition, φ c . The values of these parameters were determined by an analyzing central composite designs. After the first extraction process, phenol and benzyl alcohol concentrations in the effluent were reduced about ten times for the first and four times for the second, correspondingly.

show abstract

“…10 Therefore the importance of their removal/decolorization [11][12][13] and their determinations [14][15][16][17] in environmental samples is obvious. Many analytical methods have been suggested for extraction and determination of azo dyes such as cloud point extraction (CPE), [18][19][20] liquid-liquid extraction (LLE), 21,22 liquid phase microextraction (LPME), 23 solid phase extraction, [24][25][26] solid phase microextraction, 27 and molecularly imprinted solid phase extraction. 28 Nowadays, based on principals of green chemistry, liquid phase microextraction techniques have become very popular and many new and microextraction techniques have been developed based on classical liquid-liquid extraction.…”

Section: Introductionmentioning

confidence: 99%

Application of a Novel Micro-Cloud Point Extraction for Preconcentration and Spectrophotometric Determination of Azo Dyes

Ghasemi¹,

Kaykhaii²

2016

Journal of the Brazilian Chemical Society

View full text Add to dashboard Cite

A novel room temperature micro-cloud point extraction procedure using triton X-114 surfactant as extracting phase was developed for preconcentration and extraction of three azo dyes (orange G, methyl orange, and acid red 18) from aqueous samples using molecular absorption spectrophotometry in the visible region. The effects of different parameters such as concentration of surfactant and added salting out reagent (Na 2 SO 4 ), pH and type of diluting solvent on microextraction were studied and optimized. Under optimum conditions, calibration curves were linear in the range of 2.0-10.0, 0.2-1.0 and 2-12 mg L -1 with the detection limit of 1.6, 0.6 and 111.0 μg L -1 for orange G, methyl orange and acid red 18, respectively. The relative standard deviation was better than 13.12%. The method was applied to the determination of the azo dyes in water samples. Keywords: micro cloud point extraction, orange G, methyl orange, acid red 18, water analysis IntroductionThe importance of synthetic dyes in today industries can't be denied.1 Every year, thousands tons of such dyes are consumed in food, paper, leather, and textile industries.2,3 From these industries, large volumes of dyes are released to environment and find their way to water and soil. Environmental pollution with dyes can have dire effect on animal, plants, and human health. [4][5][6][7] One of the most important families of dyes is azo dyes that contain −N=N− bond in their structures.8 So far azo dyes have found many applications. Some azo dyes are quite harmful and poisonous, 9 and even those that are not toxic, like acid red 18, can be harmful if used in excess.10 Therefore the importance of their removal/decolorization 11-13 and their determinations [14][15][16][17] solvent (up to 3 mL). 44 To overcome these problems, in our previous work we introduced a micro-cloud point extraction (MCPE) technique. 45 While sustaining the merits of CPE, in MCPE water bath step is completely eliminated and the consumption of toxic organic solvents has been reduced from a few mL to a few ten μL. These make MCPE a fast, inexpensive, and green technique.In this paper MCPE was successfully applied for the determination of three azo dyes, orange G, methyl orange, and acid red 18 (Figure 1) in tap and wastewater samples. Acid red 18 (Panceau 4R) is a popular food color 46 and many methods have been proposed for its determination. 47,48 Methyl orange (acid orange 52 or gold orange) and orange G (orange gelb or wool orange) have many applications as textile dyeing stuff and staining agents in laboratories. These three dyes are of the most abundant used dyeing agents throughout the world and therefore can find their way to environmental sources as hazardous pollutions. 49,50 To our best knowledge this is the first report of determination of theses dyes with cloud point procedure. Non-ionic surfactant, triton X-114, was used as the extractant phase. Experimental InstrumentA Shimadzu UV-Vis spectrophotometer, UV-160 (Kyoto, Japan), equipped with two microcells (10 μL capacity, Star...

show abstract

Separation of congo red by surfactant mediated cloud point extraction

Cited by 85 publications

References 22 publications

Determination of estrogens in water by HPLC–UV using cloud point extraction

Determination of estrogens in water by HPLC–UV using cloud point extraction

Cloud point extraction of phenol and benzyl alcohol from aqueous stream

Application of a Novel Micro-Cloud Point Extraction for Preconcentration and Spectrophotometric Determination of Azo Dyes

Contact Info

Product

Resources

About