Determination of low levels of Cd(ii) in cosmetic products by spectrophotometry after separation/preconcentration with cloud point extraction

2016 ◽  
Vol 8 (12) ◽  
pp. 2673-2683 ◽  
Author(s):  
Nail Altunay ◽  
Ramazan Gürkan
Keyword(s):  
Cloud Point ◽  
Efficient Method ◽  
Cloud Point Extraction ◽  
Low Cost ◽  
Cosmetic Products ◽  
Spectrophotometric Detection ◽  
Low Levels

In the present study, a simple, low-cost and efficient method was developed for the extraction and preconcentration of Cd(ii) from cosmetic products by using cloud point extraction (CPE) prior to spectrophotometric detection.

Combination of Ultrasound-Assisted Cloud-Point Extraction with Spectrophotometry for Extraction, Preconcentration, and Determination of Low Levels of Free Formaldehyde from Cosmetic Products

2018 ◽  
Vol 101 (6) ◽  
pp. 1763-1772 ◽  
Author(s):  
Nuket Kartal Temel ◽  
Ramazan Gürkan
Keyword(s):  
Cloud Point ◽  
Cloud Point Extraction ◽  
Ion Association ◽  
Comparison Method ◽  
Cosmetic Products ◽  
Micellar Phase ◽  
Ultrasound Assisted ◽  
Low Levels ◽  
Triton X

Abstract In the present study, a new preconcentration method was developed to quantify the free formaldehyde (FA) in hair cosmetics by combining ultrasound-assisted cloud-point extraction with spectrophotometry. The method is based on the ion association of FA with cationic phenothiazine group dye, toluidine blue in presence of sulfite at pH 5.0, and then extraction of the formed complex into the micellar phase of nonionic surfactant, Triton X-114. The analyte extracted into the micellar phase was diluted with ethanol, and then detected at 630 nm by spectrophotometer. Under optimal conditions, a good linear relationship was obtained in the range of 2–120 μg/L with a detection limit of 0.38 μg/L. By preconcentration of 15 mL sample, the calibration sensitivity increased by 74-fold. The intra- and inter-day precisions expressed as RSDs are lower than 4.7 and 5.2%, respectively. Compared with other techniques, the study shown here provides a simple, fast, accurate, and reliable method for the analysis of FA in cosmetic products. The contents of FA of the samples are in the range of 3.4–25.1 mg/kg with an RSD lower than 4.6%. The results were statistically in good agreement with those obtained by an independent comparison method. Highlights: A new method was developed for the preconcentration of free formaldehyde from hair cosmetics. The method is simple, fast, precise, selective, and sensitive to detect trace formaldehyde. The precision is lower than 5.2% with recovery higher than 95% after spiking. The method was validated by comparing the results with those of independent method. The formaldehyde levels of hair cosmetics were reliably monitored and determined.

Cloud Point Extraction and Spectrophotometry Determination of Lead in Environment Water Using 5-Br-PADAP

2013 ◽  
Vol 830 ◽  
pp. 345-348
Author(s):  
Lin Gao ◽  
Sheng Jie Chen ◽  
Fang Chen ◽  
Wen Hong Zhou ◽  
Jun Long Yao
Keyword(s):  
Cloud Point ◽  
Cloud Point Extraction ◽  
Detection Method ◽  
Low Cost ◽  
Calibration Graph ◽  
Buffer Solution ◽  
Relative Standard ◽  
Triton X ◽  
Optimized Conditions

A simple, sensitive, green and low cost detection method based on the cloud point extraction (CPE) separation and spectrophotometry was proposed for the determination of lead. In pH=9.0 H3BO3 buffer solution, Pb(II) reacts with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) in the presence of Triton X-100 yielding a hydrophobic complex, which then is extracted into micro-volume surfactant-rich phase. The calibration graph was linear in the range of 20-400 µg/L (at 560 nm). Under the optimized conditions, the detection limits of 10.94 µg/L and the relative standard deviations(RSD) of 2.0% (n=5) for Lead(II) were found, respectively. The sensitivity and absorbance of this method are at least five times higher when compared with that of usual 5-Br-PADAP spectrophotometry without CPE, and the proposed method has been applied to the determination of Lead in environment water samples with satisfactory results.

Determination of trace uranium by a photo-catalytic resonance fluorescence method coupled with dual cloud point extraction

2016 ◽  
Vol 8 (30) ◽  
pp. 5984-5993 ◽  
Author(s):  
Guirong Li ◽  
Jiekang Li ◽  
Qian Han
Keyword(s):  
Cloud Point ◽  
High Selectivity ◽  
Cloud Point Extraction ◽  
Low Cost ◽  
High Sensitivity ◽  
Fluorescence Method ◽  
Resonance Fluorescence ◽  
Complex Samples ◽  
Resonance Fluorescence Method

(1) Extracting and purifying uranium in complex samples by dCPE with [UO22+–SA1]. (2) Detecting uranium super sensitively by a photocatalytic RF method with [UO22+–SA2]. (3) Coupling with separation, purification and analysis procedures exhibited a number of advantages, including high selectivity, high sensitivity and low cost.

scholarly journals Optimisation and Evaluation of Zinc in Food Samples by Cloud Point Extraction and Spectrophotometric Detection

2019 ◽  
Vol 16 (1) ◽  
pp. 41 ◽  
Author(s):  
Nurul Azwa Mohd Azizi ◽  
Nurul Yani Rahim ◽  
Muggundha Raoov Ramachandran ◽  
Saliza Asman
Keyword(s):  
Cloud Point ◽  
Cloud Point Extraction ◽  
Ethylenediaminetetraacetic Acid ◽  
Food Samples ◽  
Complexation Reaction ◽  
Canned Food ◽  
Spectrophotometric Detection ◽  
Relative Standard ◽  
Triton X

The cloud point extraction (CPE) method was developed to determine the zinc prior to Ultraviolet-visible (UV-Vis) spectrophotometry detection. Triton X-100 was applied as extractant based on the complexation reaction of Zn(II) ions with ethylenediaminetetraacetic acid (EDTA). Under optimal conditions, the CPE was used to determine the concentration of zinc in canned food samples. The amounts of zinc found in the food samples were in the range of 0.005-0.007 mg/L with relative standard deviation (RSD) of < 8 %. This confirmed that the proposed CPE method is suitable for the determination of zinc in food samples, indicating the concentration of zinc was within the permissible limit.

Cloud-point extraction followed by high pressure liquid chromatography with UV spectrophotometric detection for determination of permethrin in urine samples

2015 ◽  
Vol 7 (18) ◽  
pp. 7758-7764 ◽  
Author(s):  
Katarzyna Madej ◽  
Agnieszka Sekiewicz ◽  
Tatyana K. Kalenik ◽  
Wojciech Piekoszewski
Keyword(s):  
High Pressure ◽  
Liquid Chromatography ◽  
Cloud Point ◽  
High Pressure Liquid Chromatography ◽  
Human Urine ◽  
Extraction Method ◽  
Cloud Point Extraction ◽  
Urine Samples ◽  
Spectrophotometric Detection

A new, effective cloud-point extraction method for the determination of permethrin in human urine was developed.

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