Improved spectrophotometric determination of chromium in animal tissue digests with diphenylcarbazide

Bryson, Warren G.; Goodall, C. M.

doi:10.1016/s0003-2670(01)93587-1

Cited by 19 publications

(11 citation statements)

References 16 publications

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“…The determination of chromium at high concentrations can be performed using techniques such as, e.g., spectrophotometry [7] or atomic absorption spectroscopy (AAS) with flame or with graphite tube [8]. For ultra-trace concentrations of chromium, as present in sea water or other uncontaminated natural waters, the number of analytical techniques is restricted to a few highly sensitive procedures.…”

Section: Introductionmentioning

confidence: 99%

Study of the Complexation, Adsorption and Electrode Reaction Mechanisms of Chromium(VI) and (III) with DTPA Under Adsorptive Stripping Voltammetric Conditions

2003

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The complexation of Cr(III) and Cr(VI) with diethylenetriaminepentaacetic acid (DTPA), the redox behavior of these complexes and their adsorption on the mercury electrode surface were investigated by a combination of electrochemical techniques and UV/vis spectroscopy. A homogenous two-step reaction was observed when mixing Cr(III), present as hexaquo complex, with DTPA. The first reaction product, the electroactive 1 : 1 complex, turns into an electroinactive form in the second step. The results indicate that the second reaction product is presumably a 1 : 2 Cr(III)/DTPA complex. The electroreduction of the DTPA-Cr(III) complex to Cr(II) was found to be diffusion rather than adsorption controlled.The Cr(III) ion, generated in-situ from Cr(VI) at the mercury electrode at about À 50 mV (vs. Ag j AgCl) (3 mol L À1 KCl), was found to form instantly an electroactive and adsorbable complex with DTPA. By means of electrocapillary measurements its surface activity was shown to be 30 times higher than that of the complex built by homogenous reaction of DTPA with the hydrated Cr(III). Both components, DTPA and the in-situ built complex Cr(III) ion were found to adsorb on the mercury electrode.The effect of nitrate, used as catalytic oxidant in the voltammetric determination method, on the complexation reaction and on the adsorption processes was found to be negligible.The proposed complex structures and an overall reaction scheme are shown.

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Section: Introductionmentioning

confidence: 99%

Study of the Complexation, Adsorption and Electrode Reaction Mechanisms of Chromium(VI) and (III) with DTPA Under Adsorptive Stripping Voltammetric Conditions

2003

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“…Complex formation between Cr(VI) and DPC is an interesting reaction for spectrophotometric determination of Cr(VI) [33][34][35]. This reaction has high selectivity for Cr (VI) versus Cr (III).…”

Section: Introductionmentioning

confidence: 99%

Trace determination of chromium(VI) in environmental water samples using innovative thermally reduced graphene (TRG) modified SiO2 adsorbent for solid phase extraction and UV–vis spectrophotometry

Sereshti

Farahani

Baghdadi

2016

Talanta

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“…Hexavalent chromium is known to be carcinogenic, mutagenic and teratogenic to human health due to its strong oxidizing nature . Trivalent chromium is also used as an essential micronutrient, however, prolonged exposure to high concentrations of it may cause skin allergies and cancer in humans and under certain conditions, it can be oxidized to more toxic hexavalent chromium species by bacteria or minerals in the environment . Therefore, the US Environmental Protection Agency has established a permissible limit of 0.1 mg L −1 for total chromium species in drinking water…”

Section: Introductionmentioning

confidence: 99%

Characterization of Mycobacterium sp. strain Spyr1 biomass and its biosorption behavior towards Cr(III) and Cr(VI) in single, binary and multi‐ion aqueous systems

Aryal

Liakopoulou-Kyriakides

2013

J of Chemical Tech & Biotech

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BACKGROUND: Mycobacterium sp. biomass was used for removal of Cr(III) and Cr(VI) species from aqueous systems. Experimental results were processed with different kinetic, isotherm and thermodynamic models. Studies of the effect of co-ions, biomass characterization and desorption were also undertaken. RESULTS: Cr(III) and Cr(VI) sorption on Mycobacterium sp. biomass followed Ho pseudo-second-order kinetics. The Langmuir isotherm model described the biosorption of both chromium species, whereas the Temkin isotherm model for Cr(III) and Hill-der Boer isotherm model for Cr(VI), respectively. Selectivity for Cr(III) and Cr(VI) biosorption was observed in binary mixtures with As(V), Mg +2 , Ca +2 , Cl − , SO 4 −2 , CO 3 −2 and PO 4 −3 ions from 5 to 200 mg L −1 and with Cu +2 , Ni +2 , Co +2 , Cd +2 , Mn +2 and Zn +2 ions up to 20 and 50 mg L −1 for Cr(III) and Cr(VI) respectively. In multi-ions systems, selectivity of both chromium species was achieved at a concentration of co-ions up to 10 mg L −1 . The thermodynamic parameters indicated the spontaneous and feasible nature of biosorption processes. Amine and carboxylic groups are mainly responsible in both chromium species binding, and the phosphate group is also involved in Cr(VI) sorption. Mycobacterium biomass exhibited almost the same removal efficiency up to five subsequent biosorption-desorption cycles for the two chromium species. CONCLUSION: Mycobacterium sp. biomass can be used as efficient and economic biomass for removal of both chromium species from contaminated water. M Aryal, M Liakopoulou-Kyriakides the presence of functional groups on biomass surface that may interact with the metal ions. In addition, desorption of chromium species and regeneration of biomass was also performed. MATERIALS AND METHODS Microorganism and growth conditionsMycobacterium sp. strain Spyr1 was isolated from Perivleptos (Epirus, North-West Greece), a creosote contaminated site, in which a wood preserving industry was operating for over 30 years. According to our previous publications, 7 -10 Mycobacterium sp. was cultivated in Luria-Bertani broth containing 1.0% tryptone, 0.5% yeast extract and 0.5% NaCl (Scharlau Chemie S.A., Barcelona, Spain), using an orbital incubator shaker at 180 rpm and 30 • C (Sanyo, MIR-153, Osaka, Japan). Cells were harvested by centrifugation (Kubota 5922, Tokyo, Japan) at 2000g for 20 min during the static phase of growth after 24 h of incubation, and autoclaved (Systec, Greiz, Germany) at 121 • C for 20 min before use. Moisture content was determined by drying a pre-weighted amount of the cells in an oven (Heraeus KT 5050, West Midlands, United Kingdom) at 100 • C for 10 h. Biosorption studies in single ion aqueous systemsReference Cr(III) and Cr(VI) solutions at 1000 mg L −1 were prepared from CrN 3 O 9 .9H 2 O and K 2 Cr 2 O 7 (Merck, Darmstadt, Germany). In order to determine the optimum pH, contact time and biomass concentration, initial Cr(III) and Cr(VI) concentration of 50 mg L −1 was used. Cr(III) and Cr(VI) biosorption on Mycobacterium sp....

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Improved spectrophotometric determination of chromium in animal tissue digests with diphenylcarbazide

Cited by 19 publications

References 16 publications

Study of the Complexation, Adsorption and Electrode Reaction Mechanisms of Chromium(VI) and (III) with DTPA Under Adsorptive Stripping Voltammetric Conditions

Study of the Complexation, Adsorption and Electrode Reaction Mechanisms of Chromium(VI) and (III) with DTPA Under Adsorptive Stripping Voltammetric Conditions

Trace determination of chromium(VI) in environmental water samples using innovative thermally reduced graphene (TRG) modified SiO2 adsorbent for solid phase extraction and UV–vis spectrophotometry

Characterization of Mycobacterium sp. strain Spyr1 biomass and its biosorption behavior towards Cr(III) and Cr(VI) in single, binary and multi‐ion aqueous systems

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