scholarly journals Spectrophotometric Study of Ternary Complex Forming Systems of Some Lanthanide Metal Ions with Eriochrome Cyanine R in Presence of Cetylpyridinium Bromide for Microdetermination

2011 ◽  
Vol 8 (3) ◽  
pp. 1264-1274 ◽  
Author(s):  
A. S. Dhepe ◽  
A. B. Zade
Keyword(s):  
Metal Ions ◽  
Cationic Surfactant ◽  
Molar Absorptivity ◽  
Ternary Complexes ◽  
Water Soluble ◽  
Stoichiometric Ratio ◽  
Cetylpyridinium Bromide ◽  
Lanthanide Metal ◽  
Colored Complexes

Study of coordination compounds of lanthanide elements has received a great attention due to growing applications in science and technology. Number of chromogenic reagents form water soluble colored complexes with lanthanides. Eriochrome cyanine R (ECR) a member of triphenylmethane type of dye has been reported to form green colored complexes with lanthanides and has been used for microdetermination of these metal ions. Addition of cationic surfactant, Cetylpyridinium bromide (CPB), a cationic surfactant sensitizes the color reactions of Gd(III), Tb(III), Dy(III), Ho(III) and Lu(III) with ECR. Formation of water soluble, highly colored ternary complexes with a considerable bathochromic shift of about 50 nm in presence of surfactant has been observed. Optimum reaction conditions and other analytical parameters were also evaluated. Stoichiometric ratio 1:3:3 of Ln: ECR: CPB are responsible for the observed rise in molar absorptivity and sensitivity. Beer’s law was obeyed between 0.50 to 13.00 ppm. Effective photometric range and molar absorptivity of these ternary complexes have been calculated. Effect of some common interfering ions on determination of these lanthanide metal ions was studied. A simple, rapid and highly sensitive spectrophotometeric method has been proposed for the determination of metal ions understudy.

scholarly journals Spectrophotometric Microdetermination of Thorium(IV) and Uranium(VI) with Chrome Azurol-S in Presence of Cationic Surfactant

2011 ◽  
Vol 8 (3) ◽  
pp. 1132-1141 ◽  
Author(s):  
A. B. Upase ◽  
A. B. Zade ◽  
P. P. Kalbende
Keyword(s):  
Metal Ions ◽  
Cationic Surfactant ◽  
Bathochromic Shift ◽  
Stoichiometric Composition ◽  
Formation Constants ◽  
Ternary Complexes ◽  
Water Soluble ◽  
Molar Ratio ◽  
Chrome Azurol S ◽  
Binary And Ternary Complexes

Cationic surfactant, cetyldimethylethylammonium bromide (CDMEAB), sensitize the color reactions of Th(IV) and U(VI) with chrome azurol-S(CRAS). Formation of water soluble deeply colored ternary complexes of metal ions show large bathochromic shift. Same stoichiometric composition of ternary complexes with 1:2:4 molar ratio (M-CRAS-CDMEAB) have been observed for both the metal ions and are responsible for enhancement in molar absorptivities and sensitivities at shifted wavelength. The ternary complexes of thorium(IV) and uranium(VI) exhibit absorption maxima at 640 and 620 nm with molar absorptivities 85500 and 69600 L.mol-1.cm-2respectively. Beer’s law were obeyed in concentration range 0.12-0.185 ppm for Th(IV) and 0.13-0.162 ppm for U(VI) in presence of CDMEAB. Conditional formation constants and various analytical parameters have been evaluated and compared the results of binary and ternary complexes. Enhancement in the molar absorptivities in presence of CDMEAB clearly indicated the usefulness of these colored reactions for microdetermination.

Hydrophobic–hydrophilic ionic liquids for the extraction and determination of metal ions with water-soluble reagents

2015 ◽  
Vol 7 (22) ◽  
pp. 9629-9635 ◽  
Author(s):  
S. V. Smirnova ◽  
T. O. Samarina ◽  
I. V. Pletnev
Keyword(s):  
Ionic Liquids ◽  
Metal Ions ◽  
Water Soluble ◽  
Analytical Reagents

Water-immiscible water-rich ionic liquids + water-soluble analytical reagents = a novel extraction-based platform for the determination of metal ions.

Spectrophotometric investigation of sensitive complexing agents for the determination of zinc in serum.

1985 ◽  
Vol 31 (8) ◽  
pp. 1310-1313 ◽  
Author(s):  
R Homsher ◽  
B Zak
Keyword(s):  
Trace Metal ◽  
Atomic Absorption ◽  
Serum Zinc ◽  
Atomic Absorption Spectrophotometry ◽  
Molar Absorptivity ◽  
Water Soluble ◽  
The Other ◽  
Complexing Agents ◽  
Absorption Spectrophotometry

Abstract Of two sensitive complexometric reagents for the colorimetry of serum zinc that we investigated, one, 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP), was found to be a potentially useful compound for trace-metal determinations. It has a high molar absorptivity (120 000 L mol-1 cm-1) but is not convenient to use because it is not very soluble in water. The other reagent, a related pyridylazo compound, is 2-(5-bromo-2-pyridylazo)-5-(N-n-propyl-N-3-sulfopropylamino)phenol (5-BR-PAPS). It seems better suited for use in routine zinc determinations because, besides being water soluble, it has a higher molar absorptivity, 130 000 L mol-1 cm-1. Results by the proposed method developed with 5-Br-PAPS correlated well with those by atomic absorption spectrophotometry. The between-run CV for control sera was less than 5%; the within-run CV (same controls) was less than 4%.

scholarly journals Equilibrium, Kinetic, and Thermodynamic Studies of Anionic Dyes Adsorption on Corn Stalks Modified by Cetylpyridinium Bromide

2018 ◽  
Vol 3 (1) ◽  
pp. 4 ◽  
Author(s):  
Liudmyla Soldatkina ◽  
Marianna Zavrichko
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Cationic Surfactant ◽  
Kinetic Studies ◽  
Batch Adsorption ◽  
Cetylpyridinium Bromide ◽  
Anionic Dyes ◽  
Pseudo Second Order ◽  
Dyes Adsorption

Corn stalks (CS) were modified by a cationic surfactant, cetylpyridinium bromide (CPB), and used as an adsorbent (CS-CP) to remove anionic dyes [Acid Red (AR) and Acid Orange (AO)] from aqueous solutions. The FTIR analysis and the obtained calculations based on the determination of the adsorption capacity of CS towards CPB confirmed that the cationic surfactant had been adsorbed on the surface of corn stalks. Adsorption of the anionic dyes on modified corn stalks was investigated in a series of batch adsorption experiments at 303–328 K. The adsorption data were analyzed using Langmuir, Freundlich, and Temkin models. The Langmuir model was found to be more suitable for the experimental data of the anionic dyes on CS-CP than other adsorption models. Kinetic studies revealed that the pseudo-second order model showed the best fit to the experimental data. The thermodynamic parameters indicated that the adsorption process was spontaneous and exothermic. Mechanisms involving ion exchange and chemisorption might be responsible for the uptake of the anionic dyes on CS-CP. Obtained results imply that CS-CP could be applied as an effective adsorbent to remove anionic dyes from aqueous solutions.

scholarly journals Spectrophotometric Method for Determination of Paraquat in Food and Biological Samples

1997 ◽  
Vol 80 (2) ◽  
pp. 388-391 ◽  
Author(s):  
Ritu Kesari ◽  
Manish Rai ◽  
Vinay Kumar Gupta
Keyword(s):  
Standard Deviation ◽  
Metal Ions ◽  
Relative Standard Deviation ◽  
Alkaline Medium ◽  
Spectrophotometric Method ◽  
Biological Samples ◽  
Molar Absorptivity ◽  
Relative Standard ◽  
Sensitive Spectrophotometric Method

Abstract A sensitive spectrophotometric method was developed for determination of paraquat, a widely used herbicide. Paraquat was reduced with glucose in an alkaline medium, and the blue radical ion obtained was measured at 600 nm. Beer’s law was obeyed at 0.1–1.2 ppm paraquat. The molar absorptivity was 1.26 × 105 L mol-1 cm-1. The standard deviation and relative standard deviation were ± 0.007 and 2.0%, respectively, for 5 μg paraquat/10 mL analyzed over 7 days. The method was free from interference by other commonly used pesticides and metal ions. The method may be used to the determine paraquat in plants, fruits, grains, water, blood, and urine.

scholarly journals Colorimetric Assay of Cimetidine in the Presence of Its Oxidative Degradates

2009 ◽  
Vol 92 (2) ◽  
pp. 382-386 ◽  
Author(s):  
Alaa S Amin ◽  
Hassan A Dessouki ◽  
Sayed A Shama ◽  
Eslam A Gouda
Keyword(s):  
Rhodamine 6G ◽  
Degradation Products ◽  
Colorimetric Assay ◽  
Oxidative Degradation ◽  
Molar Absorptivity ◽  
Dosage Forms ◽  
Stoichiometric Ratio ◽  
Relative Standard ◽  
Chromotrope 2R

Abstract Three simple, accurate, and sensitive colorimetric methods for the determination of cimetidine (Cim) in pure form, in dosage forms, and in the presence of its oxidative degradates were developed. These methods are indirect, involve the addition of excess oxidant N-bromosuccinimide (NBS) for method A; cerric sulfate Ce(SO4)2 for methods B and C of known concentration in acid medium to Cim, and the determination of the unreacted oxidant by measurement of the decrease in absorbance of amaranth dye for method A, chromotrope 2R for method B, and rhodamine 6G, for method C at a suitable maximum wavelength, max: 520, 528, and 525 nm, for the 3 methods, respectively. Regression analysis of the Beer plots showed good correlation in the concentration ranges of 0.24.4 g/mL for method A, and 0.23.4 g/mL for methods B and C. The apparent molar absorptivity, Sandell sensitivity, and detection and quantitation limits were evaluated. The stoichiometric ratio between the drug (Cim) and the oxidant (NBS or Ce 4) was estimated. The validity of the proposed methods was tested by analyzing pure and dosage forms containing Cim with relative standard deviation 1.18. The proposed methods could successfully determine the studied drug with varying excess of its oxidative degradation products, with recovery between 99.2 and 101.8, 100.2 and 102.8, and 99.8 and 102.0 for methods AC, respectively.

Spectrophotometric Determination of p-aminobenzoic acid via Diazotization and Coupling reaction

2021 ◽  
pp. 5313-5318
Author(s):  
Rana S. Al-Saffar ◽  
Safaa A. Zakaria ◽  
Nabeel S. Othman
Keyword(s):  
Folic Acid ◽  
Hydrochloric Acid ◽  
Sodium Nitrite ◽  
Azo Dye ◽  
Coupling Reaction ◽  
Molar Absorptivity ◽  
Water Soluble ◽  
Good Sensitivity ◽  
Aminobenzoic Acid

A simple and accurate spectrophotometric method to assay p-aminobenzoic acid (PABA) has been suggested. The method based on the diazotization of PABA via reaction with nitrite ions which liberated in the medium through the reaction of sodium nitrite with hydrochloric acid, then coupling the dizotised-PABA(D-PABA)with 1-naphthylamine -7-sulphonic acid (1-NASA) to form an intense colored pink azo dye ,it is water-soluble , very stable and has a maximum absorbance at 525 nm. The absorbance was increase with the increasing of PABA amounts in the solution, and the linearity from 2.5 to70 µg in 10 ml (0.25to7 µg.ml-1).The molar absorptivity and Sandell ҆s sensitivity values have been calculated they equal to 3.6057x104 L.mol-1 cm -1 and 0.0037993 µg. cm-2 respectively. The two values above demonstrated a good sensitivity of the suggested method. The method has been used in estimated PABA resulted from analysis of folic acid in tablet.

Application of non-steroidal anti-inflammatory drugs for palladium determination

2010 ◽  
Vol 64 (6) ◽  
Author(s):  
Alaa Amin ◽  
Wafaa Hassan ◽  
Gamal Ragab
Keyword(s):  
Molar Absorptivity ◽  
Acetate Buffer Solution ◽  
Stoichiometric Ratio ◽  
Lauryl Sulfate ◽  
Buffer Solution ◽  
Palladium Determination ◽  
Highly Sensitive ◽  
Yellow Orange ◽  
Inflammatory Drugs

AbstractA highly sensitive spectrophotometric method for palladium determination using piroxicam and tenoxicam as new chromogenic reagents has been developed. In the presence of sodium lauryl sulfate (SLS), palladium reacts with piroxicam (PX) or tenoxicam (TX) to form stable yellow orange complexes in an acetate buffer solution of pH 5.0 at 424 nm and 426 nm with molar absorptivity of 7.16 × 104 L mol−1 cm−1 and 1.20 × 105 L mol−1 cm−1, respectively. Sandell sensitivity, detection, and quantitation limits were also calculated. Optimum conditions were evaluated considering pH, reagent concentration, time, temperature, and surfactant concentration. The complex system conforms to Beer’s law over the range of 0.07–1.28 μg mL−1 palladium. The stoichiometric ratio and stability constant were also evaluated. Tolerance limits of many cations and anions were determined. Finally, the proposed method was applied successfully in the determination of palladium in jewellery, anode mud, synthetic mixtures, catalysts, and alloy samples.

scholarly journals Solvent Extraction Studies on Copper(II) and Silver(I) Complexes of Bis(4-hydroxypent-2-ylidene)diaminoethane: Composition of Extracted Copper(II) Species

2011 ◽  
Vol 8 (4) ◽  
pp. 1864-1871 ◽  
Author(s):  
P. O. Ukoha ◽  
F. I. Nwabue ◽  
L. N. Obasi
Keyword(s):  
Solvent Extraction ◽  
Equilibrium Constant ◽  
Molar Absorptivity ◽  
Low Ph ◽  
Water Soluble ◽  
Continuous Variation ◽  
Maximum Absorption ◽  
Ionic Complexes ◽  
Elemental Analyses

Copper(II) complexes of bis(4-hydroxypent-2-ylidene)diaminoethane (BHPDE) were prepared by extractive method. Job’s continuous variation and equilibrium constant methods, as well as spectral and elemental analyses were applied in the determination of the nature of extracted species. The results indicate the formation of mixed ionic complexes of the types Cu(H2L)X2, Cu(H2L)2X2and CuL (where H2L = BHPDE and X = NO3-, CIO4-, Cl-or ½SO42-). Cu(H2L)X2and Cu(H2L)2X2predominate at low pH extractions while CuL chelate predominates at high pH extraction. The complexes exist in two isomeric forms, the blue readily-water-soluble and the violet less water-soluble forms. Both complexes show maximum absorption at 540 nm and molar absorptivity values of about 2.0 x 102dm3mole-1cm-1.

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