Spectrophotometric Determination of Cobalt(II) Using the Chromogenic Reagent 4,4′-Diazobenzenediazoaminoazobenzene in a Micellar Surfactant Medium

Gu, Junjie; Zhu, Yan; Wanquan, Jiang; Xie, Boping; Cheng, Bin

doi:10.1039/a606804i

Cited by 33 publications

(9 citation statements)

References 6 publications

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“…16 The China National Environmental Monitoring Centre reported cobalt levels of 15 µg/g and 26 µg/g. 24 In plants cobalt is required by the urease enzyme. Cobalt has only a low affinity to humic substances, 12 and it is adsorbed to clay minerals in soil and geological origin by specific reactions.…”

Section: Cobaltmentioning

confidence: 99%

Availability of Selected (Pollutant) Elements and their Influence on Soil Composition in Urban Area

Zeiner¹,

Cindrić²,

Ivanović³

et al. 2015

Croat. Chem. Acta

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Abstract. Interest in growing fruits and vegetables in private gardens is rising due to nowadays ecological awareness. Avoiding artificial fertilizers and plant protection products does not guarantee the absence of toxic substances, especially heavy metals in the soil and thus in the fruits harvested. Due to either geological bedrock weathering or environmental pollution, garden soils may be rich in certain potentially toxic elements. In the present study ten garden soils from central Croatia have been analysed by the BCR method for the contents and bioavailability of aluminium, cadmium, chromium, cobalt, copper, lead, manganese, nickel and zinc.The total amounts of the elements are in the concentration range as reported for agricultural soils in different geographical regions. Only two soils of the capital Zagreb have higher concentrations of pollutant metals, such as chromium, cobalt, copper, lead, manganese and zinc. Regarding nutrients, all soils have met the needs of common garden plants.

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Section: Cobaltmentioning

confidence: 99%

Availability of Selected (Pollutant) Elements and their Influence on Soil Composition in Urban Area

Zeiner¹,

Cindrić²,

Ivanović³

et al. 2015

Croat. Chem. Acta

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“…The selection of the number of the factors in the PLS algorithm is very important to achieve the best prediction. The number of factors was estimated in the PLS1 by cross-section validation method, leaving out one sample at a time and plotting the prediction residual error sum of squares (PRESS) versus the number of factors for each individual component [20,21]. PRESS was computed using following equation:…”

Section: Resultsmentioning

confidence: 99%

Statistical Calibration of Model Solution of Analytes

Simeonov¹,

Spasov²,

Simeonova³

2012

Ecological Chemistry and Engineering S

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Abstract:A new method based on spectrophotometric-partial least-squares procedure was proposed for simultaneously determination of thorium and zirconium using SPADNS (4,5-Dihydroxy-3-(p-sulfophenylazo)-2,7-naphthalene disulfonic acid, trisodium salt) as a color reagent. Absorbance measurements were made in the range of λ = 541÷620 nm with 1.0 nm steps in buffered solutions at pH 3.5. The linear ranges were obtained for 0.5÷11.5 and 1.5÷14.5 µg cm -3 for Th 4+ and Zr 4+ ions, respectively. The limits of detection were determined 0.4 and 1.2 µg cm -3 for thorium and zirconium, respectively. The standard deviation (n = 3) and recovery percent of 10 samples in the prediction set were obtained in the amplitude 0.22÷0.38 µg cm -3 and 91.3÷109.2, respectively. The proposed method was used for simultaneously determination of mentioned ions in spiked real water samples and wastewater. The results show that the method is applicable for the analysis of samples with similar matrix.

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“…Micellar systems are convenient to use because they are optically transparent, readily available and stable 11 . In the field of metal ion complexation, micelles form a ternary complex at concentrations below or above the critical micelles concentration (CMC) which has advantageous properties, such as hyperchromic and bathochromic displacements, so that sensitivity of the method can be modified by affecting the interferences of matrix 12 . Micellar system has an important ability to solubilize slightly insoluble or even very insoluble complexes and/or ligands which introduces it as a typical manner [13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Selective and Sensitized Spectrophotometric Determination of Cr(III) Ion using 2-(Phenyl)-4,5-di(4-methoxyphenyl)imidazole, Ligand for Speciation of Chromium Ion in Triton X-100 as Surfactant

2018

Chem Sci Trans

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Highly interference-free sensitized and sensitive spectrophotometric method for the determination of Cr(III) ion is described. The method is based on the reaction between Cr(III) ion and benzyl dioxime in micellar in the presence of non-ionic surfactant Triton X-100 has been performed. The absorbance is linear from 0.1 up to 25.0 µgml −1 in aqueous solution. The repeatability (RSD) is 1.3% at a concentration of 1 µg mL −1 with molar absorption coefficient of 68,600 Lmol −1 cm −1 and detection limit of 0.12 ngmL −1 . The influence of reaction variables including pH, amount of 2-(phenyl)-4,5-di(4-methoxyphenyl)imidazole (PDMPI), type and amount of surfactant, complexation time and the effect of interfering ions, were investigated. The proposed methods have been applied to the rapid and simple determination of Cr(III) ion in the real samples successfully with recovery yield of almost 100%. The method does not need any separation or organic solvent extraction.

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Spectrophotometric Determination of Cobalt(II) Using the Chromogenic Reagent 4,4′-Diazobenzenediazoaminoazobenzene in a Micellar Surfactant Medium

Cited by 33 publications

References 6 publications

Availability of Selected (Pollutant) Elements and their Influence on Soil Composition in Urban Area

Availability of Selected (Pollutant) Elements and their Influence on Soil Composition in Urban Area

Statistical Calibration of Model Solution of Analytes

Selective and Sensitized Spectrophotometric Determination of Cr(III) Ion using 2-(Phenyl)-4,5-di(4-methoxyphenyl)imidazole, Ligand for Speciation of Chromium Ion in Triton X-100 as Surfactant

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