Spectrophotometric determination of boron in human hair with azomethine H

Ciba, Jerzy; Chruściel, Arkadiusz

doi:10.1007/bf00321710

Cited by 15 publications

(6 citation statements)

References 16 publications

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“…Boron was assayed spectrophotometrically using azomethine H in acetate buffer [27]. The absorbance was measured with a Varian Cary 50 Scan spectrophotometer at 415 nm, with a 1 cm cuvette against blank test.…”

Section: Determination Of Boronmentioning

confidence: 99%

Removal of boron dissolved in water

et al. 2007

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The study aimed to investigate boron adsorption on activated carbon, activated carbon impregnated with different substances, activated alumina, zirconium dioxide and silica‐aerosil. The removal of boron from water was carried out in static and dynamic systems. Isotherms for boron adsorption from model aqueous solutions on various adsorbents were applied and Langmuir constants were calculated. The results indicate that the application of the impregnants increases the ability of activated carbon to adsorb boron. The first removal of boron using activated carbon impregnated with mannitol compared favorably with other impregnants. © 2007 American Institute of Chemical Engineers Environ Prog 26:71–77, 2007.

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Section: Determination Of Boronmentioning

confidence: 99%

Removal of boron dissolved in water

et al. 2007

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“…At the end of the experiment, the suspension was centrifuged and filtered through medium paper filters. The filtrate was analyzed for boron concentration by ultravioletvisible (UV-vis) spectrometry using Azometyne H [43]. Each adsorption experiment was repeated three times in order to have average values.…”

Section: Methodsmentioning

confidence: 99%

A new adsorbent for boron removal from aqueous solutions

Kluczka

Korolewicz

Zołotajkin

et al. 2013

Environmental Technology

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A new adsorbent based on natural clinoptilolite and amorphous zirconium dioxide (ZrO2) was prepared for the uptake of boron from fresh water. The sorption behaviour of this adsorbent for boron was investigated using a batch system and found to obey Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. The ZrO2 loading level, pH, temperature, contact time, initial boron concentration and adsorbent dose, on the removal of boron were studied. It was found that the removal of boron increased while the adsorbent dose increased and the temperature decreased at an optimum pH (pH = 8) and a contact time of 30 min. At optimum conditions, the maximum boron percentage removal was 75%. According to the D-R model, the maximum capacity was estimated to be > 3 mg B/g of the adsorbent. The adsorption energy value (calculated as 9.13 kJ/mol) indicated that the adsorption of boron on clinoptilolite modified with ZrO2 was physical in nature. The parameters of the adsorption models and the pH investigations pointed to the possibility of a chemisorption process. The thermodynamic parameters (standard entropy deltaS degrees, enthalpy deltaH degrees , and free energy deltaG degrees changes) of boron adsorption were also calculated. The negative value of deltaS degrees indicated a decreased randomness at the solid-solution interface during the boron adsorption. Negative values of deltaH degrees showed the exothermic nature of the process. The negative values of deltaG degrees implied that the adsorption of boron on clinoptilolite modified with amorphous ZrO2 at 25 degrees C was spontaneous. It was considered that boron dissolved in water had been adsorbed both physically and chemically on clinoptilolite modified with 30% ZrO2.

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“…In general, the most common methods for the determination of boron concentration are spectrophotometric methods based on various organic colour reagents. However, reagents for the spectrophotometric determination of boron are not ideal [14][15][16][17][18][19][20][21][22][23][24][25] (see Table 1). Most of the reagents require a concentrated H 2 SO 4 medium, so their application for routine boron determination is not satisfactory.…”

Section: Introductionmentioning

confidence: 99%