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1985, Talanta
2-[2-(5-Chloropyridyl)azo]-5-dimethylaminophenol (C1DMPAP) is proposed as a metallochromic indicator for zinc. The end-point colour change is from the violet-red of the zinc complex to the brownish-yellow of the indicator. The colour contrast is markedly greater than that for Erio-T.
Research Journal of Life Sciences, Bioinformatics, Pharmaceutical and Chemical Sciences
Complexometric Determination of Zinc Using Hydroxytriazene as a Metallochromic Indicator2020 •
New metallochromic indicators belonging to the class of hydroxytriazenes has been evaluated for the direct complexometric determination of Zinc in the presence of diverse ions. Reagent no (i), (ii) and (iii) has been found to be excellent indicators in the titration with EDTA at pH 6.95-7.50, 6.90-7.60 and 7.00-7.50 respectively. The colour at the end point was from light green to colourless and the titration was carried out between temperature range of 20-60C. Cl, Br,CH3COO , CO3 , SO4 , NO2 , SO3 , F, NO3 , I, S, WO4 , MO7O24 , NH4 , Na, K, U(VI), Mn(II), Ba(II), Hg(II), Sn(II), Cd(II), Mg(II), Ca (II), Zr(IV) can be tolerated in the titration of zinc (II) when they are present in equivalent amount with that of zinc (II). However, PO4 , Co (II), Cu (II) and Ni (II) interferes and when present in the environmental samples, separation techniques such as masking and demasking agents must be employed. The utility of the technique was checked by using 3-Hydroxy-3-m-toly-1-0-Carboxyphen...
A new, simple, and sensitive quantitative spectrophotometric method for the rapid determination of zinc(II) using six azo compounds based on 3-amino-1,2,4- triazole, namely f3-(2,4-dihydroxy-1-phenylazo)-1,2,4-triazole) (I), 3-(2-hydroxy-5- methyl-1-phenylazo)-1,2,4-triazole) (II), 3-(2-hydroxy-5-acetyl-1-phenylazo)-1,2,4- triazole) (III), 3-(2-hydroxy-5-ethylcarboxylate-1-phenylazo)-1,2,4-triazole) (IV), 3-(2-hydroxy-5-formyl-1-phenylazo)-1,2,4-triazole) (V), and 3-(2-hydroxy-5-bromo- 1-phenylazo)-1,2,4-triazole) (VI), has been developed for use in aqueous media containing 40% (v/v) methanol. Linear calibration graphs are obtained up to 2.6, 5.9, 5.2, 5.2, 8.2 and 9.0mgmL21 using ligands I, II, III, IV, V, and VI, respectively. Absorption maxima, molar absorptivities, and Sandell’s sensitivities of 1:2 (M:L) complexes were found to be 490, 530, 505, 520, 550, and 510nm, 4.86 104, 2.10 104, 1.26 104, 0.10 104, 0.19 104, and 0.29 104 Lmol21 cm21, and 0.0014, 0.0031, 0.0052, 0.0662, 0.0348, and 0.0225mgcm21 for ligands I, II, III, IV, V, and VI, respectively. Using the masking agents, the color reactions are free from interference by more than 30 ions investigated. The method has been applied to the spectrophotometric determination of trace amounts of zinc in pharmaceutical formu- lations and human hair samples. A study of some zinc solid complexes showed that chelation takes place through one nitrogen atom of the azo group and proton displace- ment from the hydroxyl group.
2008 •
Analytica Chimica Acta
Simultaneous determination of copper, nickel, cobalt and zinc using zincon as a metallochromic indicator with partial least squares2003 •
2004 •
2003 •
Song, M. K., Adham, N. F., and Rinderknecht, H.: A simple, highly sensitive colorimetric method for the determination of zinc in serum. Am J Clin Pathol 65: 229-233, 1976. A simple, reliable, highly sensitive method for the determination of zinc in biological fluids is described. Interfering trace metals are removed as insoluble iodides or hydroxides prior to complex formation of zinc with dithizone in a Tris-buffered trichloroacetate centrifugate. Absor-bance of the chelate is read at 555 nm. The sensitivity of the new method is comparable to that of atomic absorption spectrophotometry, and the results of zinc determinations of 23 sera by the two procedures agree to within acceptable limits of experimental error. (
A rapid, sensitive and specific RP-HPLC method involving UV detection was developed and validated for determination and quantification of (DMAPIMP) 2 Zn . Chromatography was carried out on Waters 2695 separation module HPLC system with Waters 2487 Dual wavelength Absorbance detector and Waters 2998 Photodiode Array Detector using a stainless steel column of dimension 15 cm x 4.6 mm , packed with octadecylsilane bonded to porous silica (Make : Phenomenex Prodigy 5 µ ODS 3 100A column is suitable) using filtered and degassed mixture of Buffer (Prepared by addition of 1 L purified water and 10 ml Acetic Acid and 5 ml Triethylamine) and Acetonitrile (60:40) as a mobile phase at a flow of 1.0 ml/min and effluent was monitored at 254 nm . The method was validated in terms of Specificity, Linearity and Range, Precision, Accuracy, Intermediate Precision, Solution Stability and Robustness. The assay was linear over the concentration range of (DMAPIMP) 2 Zn 0.05 mg/ml to 0.15 mg/ml respective...
International Journal of Analytical Chemistry
Green Analytical Approach for the Determination of Zinc in Pharmaceutical Product Using Natural ReagentA selective, sensitive, and environmentally safe spectrophotometry method was developed and validated for the determination of zinc in pharmaceutical substances using natural reagents obtained from the leaves of plant Acacia catechu. Different factors were optimized such as volume of reagent, selection of pH, and stability of the color complex. The drug showed a stable yellowish orange color complex at 550 nm. The greenness of the methods was estimated using an eco-scale tool where the presented method was found to be excellent green with an ecoscore of 84 based on spectrophotometric determination. Also, the greenness of the method was assessed by the Green Analytical Procedure Index and found to be eco-friendly. The method was validated in conformance with ICH guidelines, with acceptable values for linearity, accuracy, precision, LOD, and LOQ. The linearity range for zinc sulphate was 5–25 μg mL−1 with an R2 value of 0.996. The % RSD for intraday precision and interday precision wa...
A method ./or the determination of operationa/ly-defined metal species at natural concentration levels has been developed. The method is based on a combination ol physical characterization by size ./i'actionation using ultra./iltration and chemica! characterization by retention studies on different solid sorbents. The aim (~l this study is to investigate the e.ffect ofpH on its pe!formance. A set of three columns packed with di{{erellt sorbents, name~IJ, cation-exchange resin Chelex-/OO, anion-exchange resin Dowex /-X8 and C-/8 reversed phase was developed. The retention of meta! species in each size '/;y/ction onto the sorbents at different pH conditions was investigated. Experiments were lx/formed with metals in the presence of model ligands, name~v, nitrilotriacetic acid (NTA) , ethylenediamine tetraacetic acid (EDTA), humic acid (HA) , 8-hydroxyquinoline-5-sulphonic acid (SOX) a/ld 8-hydroxyquinoline (OX). The applicabi/i~l' 0/ the method was investigated using synthetic river water samples ,spiked with ,species o/zinc.
Arxiv preprint arXiv:1204.1583
Description of the Operational Mechanics of a Basel Regulated Banking System2012 •
Computational Cybernetics
Application of Fractional Calculus in Engineering Sciences2008 •
American Journal of Comparative Law
"Comparing Islamic and international laws of war: orthodoxy, 'heresy,' and secularization in the category of civilians." American Journal of Comparative Law 69:1 (2021): 136-67.2021 •
Revista CIDOB d'Afers Internacionals, nº. 136
América Latina en el nuevo escenario internacional: ¿qué espacio hay para el regionalismo y la cooperación regional?Revista De Gestão Social E Ambiental
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Reply to: "The absence of multiple atypical nevi in germline CDKN2A mutations2016 •
Pediatric surgery international
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Positive Body Image and Sexual Functioning in Dutch Female University Students: The Role of Adult Romantic Attachment2015 •
Physics in Medicine & Biology
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