scholarly journals Cloud Point Extraction for Pre-Concentration and Spectrophotometric Determination of Trace Amounts of Silver Ions

2020 ◽  
Vol 10 (03) ◽  
pp. 459-464
Author(s):  
Azhar A. Ghali
Keyword(s):  
Detection Limit ◽  
Cloud Point ◽  
Spectrophotometric Determination ◽  
Cloud Point Extraction ◽  
Incubation Temperature ◽  
Chelating Agent ◽  
Silver Ions ◽  
Ionic Surfactant ◽  
Triton X

During the last years, the cloud point extraction was applied for determination, separation, and enrichment of the elements. The current study used cloud point extraction (CPE) for the extraction of Ag(I) ions pre-concentration from watery solutions by a non-ionic surfactant (Triton X-114) and chelating agent a 6-(4-bromo-phenylazo)m-anisidine[6-(4-BrPAA)], then estimation by using the spectrophotometry at 514 nm. Several condition effects on the efficiency of the cloud-point extraction included Triton X-114 concentration, [6-(4-BrPAA)] concentration, pH, time, and incubation temperature. The silver reacts with [6-(4-BrPAA)] to produce complex at a ratio of one to one. 0.009 to 1.5 μg mL-1 is the range of linearity. The detection limit and quantification of Ag(I) ion were 0.0054 and 0.0182 μg mL-1, respectively. The interference of the cations was examined. The cloud-point extraction was used for the evaluation of silver concentration in the water specimen.

Cloud Point Extraction-Fluorimetric Combined Methodology for the Determination of Magnolol

2013 ◽  
Vol 699 ◽  
pp. 34-39
Author(s):  
Li Liu ◽  
Xia Shi Zhu
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Cloud Point ◽  
Relative Standard Deviation ◽  
Cloud Point Extraction ◽  
Calibration Graph ◽  
Optimum Conditions ◽  
Relative Standard ◽  
Triton X

A new Triton X-114 cloud point extraction combined with fluorometry method for analysis of magnolol in drug samples was developed. Under the optimum conditions, the calibration graph was linear in the range of 2.0-150.0ng/mL of magnolol in the initial solution with r = 0.9998. Detection limit (DL) was 0.03ng/mL (S/N=3) and the relative standard deviation (RSD) for 20.0ng/mL of magnolol was 2.79%(n=11). The method was successfully applied for the determination of magnolol in drug samples with satisfactory results.

scholarly journals Cloud Point Extraction and Determination of Silver Ion in Real Sample using Bis((1H-benzo[d]imidazol-2yl)methyl)sulfane

2011 ◽  
Vol 8 (1) ◽  
pp. 435-442 ◽  
Author(s):  
Farshid Ahmadi ◽  
Khodabakhsh Niknam ◽  
Ebrahim Niknam ◽  
Saeid Delavari ◽  
Azadeh Khanmohammadi
Keyword(s):  
Cloud Point ◽  
High Efficiency ◽  
Cloud Point Extraction ◽  
Chelating Agent ◽  
Bath Temperature ◽  
Silver Ion ◽  
Complexing Agent ◽  
Ionic Surfactant ◽  
Ultra Trace

Bis((1H-benzo[d]imidazol-2yl)methyl)sulfane (BHIS) was used as a complexing agent in cloud point extraction for the first time and applied for selective pre-concentration of trace amounts of silver. The method is based on the extraction of silver at pH 8.0 by using non-ionic surfactant T-X114 and bis((1H-benzo[d]imidazol-2yl)methyl)sulfane as a chelating agent. The adopted concentrations for BHIS, Triton X-114 and HNO3, bath temperature, centrifuge rate and time were optimized. Detection limits (3SDb/m) of 1.7 along with enrichment factor of 39 for silver ion was achieved. The high efficiency of cloud point extraction to carry out the determination of analytes in complex matrices was demonstrated. The proposed method was successfully applied to the ultra-trace determination of silver in real samples.

scholarly journals Formulation of chelating agent with surfactant in cloud point extraction of methylphenol in water

2018 ◽  
Vol 5 (7) ◽  
pp. 180070 ◽  
Author(s):  
H. Z. Hazrina ◽  
M. S. Noorashikin ◽  
S. Y. Beh ◽  
S. H. Loh ◽  
N. N. M. Zain
Keyword(s):  
Cloud Point ◽  
High Performance ◽  
Cloud Point Extraction ◽  
Chelating Agent ◽  
Reversed Phase ◽  
Ionic Surfactant ◽  
Relative Standard ◽  
Separation And Preconcentration ◽  
Interference Study

Cloud point extraction (CPE) is a separation and preconcentration of non-ionic surfactant from one liquid phase to another. In this study, Sylgard 309 and three different types of additives for CPE, namely CPE-Sylgard, CPE-Sylgard-BMIMBr and CPE-Sylgard-GLDA, are investigated to extract methylphenol from water samples. The methylphenols are well separated by reversed-phase high-performance liquid chromatography (HPLC) with isocratic elution of acetonitrile : water; 60 : 40 (v/v) and detection at 260 nm. The optimized parameters for the effect of salt, surfactant, temperature, time of extraction, pH, interference study and the performance of different additives on methylphenol extraction are investigated. CPE-Sylgard-GLDA is chosen because it gives us a high peak and good peak area compared with CPE-Sylgard and CPE-Sylgard-BMIMBr. The recovery extractions of CPE-Sylgard-GLDA are obtained in the range of 80–99% as the percentage of relative standard deviation (RSD) is less than 10. The LOD and LOQ are 0.05 ppm and 0.18 ppm, respectively. The method developed for CPE-Sylgard-GLDA coupled with HPLC is feasible for the determination of methylphenol because it is simple, effective, cheap, and produces a high percentage of recovery.

scholarly journals Room temperature cloud point extraction: An application to preconcentration and spectrophotometric determination of copper(II)

2020 ◽  
Vol 85 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Denys Snigur ◽  
Alexander Chebotarev ◽  
Vitaliy Dubovyi ◽  
Dmytro Barbalat ◽  
Anastasiia Klochkova
Keyword(s):  
Sulfuric Acid ◽  
Cloud Point ◽  
Spectrophotometric Determination ◽  
Cloud Point Extraction ◽  
Limit Of Detection ◽  
Extraction Procedure ◽  
Rich Phase ◽  
Triton X ◽  
Determination Of Copper

The novel cloud point extraction procedure for preconcentration of copper(II) was discovered. A simple chemical method for initiating the cloud point extraction (CPE) has been proposed. The formation of surfactant rich phase in a system containing a nonionic surfactant Triton X-100, copper(II), 6,7-dihydroxy-4-methyl-2-phenylbenzopyrilium chloride (DHMPhB) and ammonium benzoate is observed immediately upon the sulfuric acid addition into solution. Under the optimal conditions (absorption band maximum was 540 nm, concentration 1.5?10-4 mol dm-3 of DHMPhB, 1.0 vol.% of Triton X-100, 2.0 cm3 of 0.75 mol dm-3 ammonium benzoate, and 1.0 cm3 of 0.5 mol dm-3 sulfuric acid solution for obtaining benzoic?benzoate buffer solution with pH 4.5 and initiation immediate surfactant rich phase formation) the calibration plot for spectrophotometric determination of copper(II) was linear in the range of copper(II) concentration 0.02?0.95 ?g cm?3. The limit of detection was calculated 0.006 ?g cm?3. The water samples were analyzed according to a suggested procedure with satisfactory results.

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