Photometric methods in inorganic trace analysis (Wilson and Wilson's comprehensive analytical chemistry, vol. XX.)

Upor, E.; Mohai, Miklos Peter; Novak, Gy.; Tyson, Julian F.

doi:10.1016/s0003-2670(00)82854-8

Cited by 3 publications

(4 citation statements)

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“…The concentrations of copper and zinc cations were measured by inversion voltammetry 18 and colorimetry with diethyldithiocarbamate and dithiazone, respectively. 19 Silver cations were measured by the atomic absorption method. 19 Sulfate solutions of silver, copper, and zinc cations were used and 0.5 M sodium sulfate was used as an indifferent electrolyte.…”

Section: Methodsmentioning

confidence: 99%

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Adsorption of Copper, Silver, and Zinc Cations on Polarized Activated Carbons

Goldin

Volkov

Namychkin

2005

J. Electrochem. Soc.

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The adsorption of silver, copper, and zinc cations from aqueous solutions on polarized activated carbons was studied along with the effect of the polarization methods. A significant difference between the adsorption activities of preliminary polarized activated carbon and activated carbon directly polarized by a potentiostat was not found. However, the adsorption of cations caused shifts in the potential of the preliminary polarized activated carbon to more positive values. The investigation of the adsorption kinetics and the isotherms of silver, copper, and zinc cations shows the dependence of the adsorption activity on the potential of carbon sorbents. The polarization of the activated carbon electrode leads to a change of the isotherm's type from Langmuir to Henry through a row of transient and S-shaped isotherms. This observation can be explained by electroreduction or electro-oxidation of surface compounds of activated carbon. Adsorption rate constants for Cu 2+ and Zn 2+ ions at activated carbon were obtained.

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Section: Methodsmentioning

confidence: 99%

“…19 Silver cations were measured by the atomic absorption method. 19 Sulfate solutions of silver, copper, and zinc cations were used and 0.5 M sodium sulfate was used as an indifferent electrolyte.…”

Section: Methodsmentioning

confidence: 99%

Adsorption of Copper, Silver, and Zinc Cations on Polarized Activated Carbons

Goldin

Volkov

Namychkin

2005

J. Electrochem. Soc.

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“…Changes in Na 2 SO 4 concentration were not detected during 180 min contact of AG-3V sintered sample with 0.5 M Na 2 SO 4 solution. Copper cations were determined by colorimetry, 27 calcium cations were determined by titration with Chromagen Dark Blue and Trilon B. 28…”

Section: Methodsmentioning

confidence: 99%

Adsorption of Copper and Calcium Cations on Polarized Activated Carbon Modified by Quercetin

Goldin

Volkov

Namychkin

et al. 2005

J. Electrochem. Soc.

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The effect of immobilized quercetin on activated carbon on Cu 2+ and Ca 2+ adsorption, as a function of a potential, was investigated. Ranges of potentials, corresponding to areas of selective adsorption of investigated cations, were obtained. Ca 2+ ions do not adsorb on unmodified activated carbon AG-3V. In contrast, the modification of the activated carbon increases the adsorption activity of Ca 2+ . There are two areas of selective adsorption of Ca 2+ ions. The selective adsorption of Cu 2+ ions on unmodified sorbent was not found. The selective adsorption of Cu 2+ ions on the quercetin-modified activated carbon initiates at potentials near E = −0.25 V. Dissolved oxygen and the acidification of a solution, containing calcium or copper ions, decrease the adsorption activity on modified and unmodified activated carbons.

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“…Domestic water sample were collected in duplicate using 500 ml plastic containers, previously soaked overnight in a mixture of concentrated nitric and hydrochloric acids. The bottles were rinsed 3 times in distilled water and the sample respectively, 2 mls of concentrated HCL was added for preservation of trace metals [17]. When sampling boreholes, the water sample, was lifted using a water bucket only dedicated for sampling.…”

Section: Sapling Proceduresmentioning

confidence: 99%

Selected Trace Elements in Domestic Water Boreholes and Their Implications on Human Health, in Huruma Estate, Eldoret Municipality, Uasin-Gishu County, Kenya

Ndwiga¹

2014

JEP

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Trace elements constitute less than 1% of the rocks in the crust (Stumm and Morgan, 1991). In the human body, they constitute less than 100 mg/kg (0.01%). These elements are released to the environment naturally by weathering and volcanic activities (Flint and skinner, 1997). It has been observed that trace elements are greatly absorbed and retained in the body when in liquid diet. This phenomenon also influences the risk to human health, especially of infants and children whose immature digestive system further promote absorption of toxic heavy metals. The study was based on the analysis of domestic borehole water supplies in Huruma estate of Eldoret Municipality for selected trace elements and their implications on human health. The boreholes were systematically selected for sampling points and trace elements, Cr, Cu and Se analyzed using AAS. Statistical analysis for mean, standard deviation and confidence interval limits was done using SPSS. The statistical t-test was used to test for significance differences at (p = 0.05). The graphs were drawn using the Microsoft Excel package. The resulting data obtained from analysis were compared with WHO data for drinking water. In the study, the mean values of the following parameters were as follows: Chromium 17.9 µg/L, Copper 563 µg/L and Selenium 22.7 µg/L. There was a significant difference at 5% level of significance (p = 0.000) in all the parameter values among the sampling points in Huruma estate. The above mean values were far below the WHO recommended limits for drinking water. It was concluded that the borehole water from Huruma was fit for drinking and therefore could not cause cancer and cardiovascular diseases. However, borehole water should be used if other water sources (tap water etc.) were not available. All the industries near Huruma estate should carefully analyze and regularly monitor their liquid waste effluents to ensure that no harmful discharges get into the soil.

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Photometric methods in inorganic trace analysis (Wilson and Wilson's comprehensive analytical chemistry, vol. XX.)

Cited by 3 publications

References 0 publications

Adsorption of Copper, Silver, and Zinc Cations on Polarized Activated Carbons

Adsorption of Copper, Silver, and Zinc Cations on Polarized Activated Carbons

Adsorption of Copper and Calcium Cations on Polarized Activated Carbon Modified by Quercetin

Selected Trace Elements in Domestic Water Boreholes and Their Implications on Human Health, in Huruma Estate, Eldoret Municipality, Uasin-Gishu County, Kenya

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