Determination of total chromium traces in tannery effluents by electrothermal atomic absorption spectrometry, flame atomic absorption spectrometry and UV–visible spectrophotometric methods

Monteiro, Maria Inês Couto; Fraga, Ics; Yallouz, Allegra Viviane; Oliveira, Nilza Maria Miranda de; Ribeiro, S.H

doi:10.1016/s0039-9140(02)00317-x

Cited by 54 publications

(26 citation statements)

References 21 publications

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“…All measurements were made at 357.9 nm, by using a Cr hollow-cathode lamp (Varian) with a current of 6 mA and a bandwidth of 0.2 nm. The temperature program was the same employed by Monteiro et al (2002) for atomization on a pyrolytic graphite platform. The analyte addition method was used.…”

Section: Experimental Equipmentmentioning

confidence: 99%

“…The two main oxidation states of chromium, Cr(III) and Cr(VI), present in natural waters, significantly differ in biological, geochemical and toxicological properties. Over a narrow concentration range, trivalent chromium is considered essential for mammals for the maintenance of glucose, lipid and protein metabolism, whereas Cr(VI) is reported to have a toxic effect on humans (Lin et al, 2001;Monteiro et al, 2002).The high toxicity of Cr(VI) is related to its ability to cross the cell membrane and its strong oxidation properties (Girard et al, 1996). Hexavalent chromium is readily soluble in water and can be accumulated in soil and plants (Kumar et al, 1997), while Cr(III) probably exists in environmental waters in the form of many different species: hydrolysed, complexed and adsorbed on colloidal matter.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis

Soares

Carneiroa

Monteiro

et al. 2009

Chemical Speciation & Bioavailability

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A simple, fast and sensitive spectrophotometric method for the simultaneous determination of Cr(III) and Cr(VI) in effluents and contaminated waters using a UV-visible spectrophotometer, which operates with an advanced software for multicomponent analysis, is proposed. The method consists in the complexation of Cr (III) with EDTA and reaction of Cr(VI) with diphenylcarbazide (DPC). Variables, such as pH and colour stability time, were studied. The effect of concomitant ions on the simultaneous Cr(III) and Cr(VI) determination was also investigated. The sums of the chromium species concentrations obtained by the proposed method were compared with the total chromium concentrations found by electrothermal atomic absorption spectrometry. Recoveries of the chromium species between 75 and 136% were obtained for spiked samples. The linear working range for Cr(III) was 0.5 -30 mg L

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Section: Experimental Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis

Soares

Carneiroa

Monteiro

et al. 2009

Chemical Speciation & Bioavailability

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“…Atomic Absorption Spectrometry (AAS) was applied to quantify the concentration of chromium from the cell free supernatant of samples collected from detoxification and degradation of leather dust assay [17,25,26]. Samples were prepared as a 1 in 10 dilution in 0.2 M Nitric acid to ensure detection within the limits of the AAS equipment.…”

Section: Quantification Of Chromium Concentration In Supernatantmentioning

confidence: 99%

Biosurfactant Production and Biodegradation of Leather Dust from Tannery

Greenwell¹,

Sarker²,

Rahman³

2016

TOBIOTJ

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Background:The leather industry contributes vast amounts of pollution damaging to aquatic and terrestrial environments. Leather dust is a chromium-contaminated waste produced from the shaving and buffering processes involved in leather tanning. Microorganisms have been investigated for their usefulness in bioremediation and recycling of waste materials. Solid leather waste is the current focus of material to be remediated in this study. Objective:The present work focuses on the development of a process to degrade the leather dust protein with the aim of removing the chromium bound within the protein. As part of the study, detecting the presence of biosurfactant production was performed to fuel further interest in value-added by-products of the process. Method:Bacillus subtilis SA-6 was used to treat the leather dust over a 10 day shake flask study. Daily samples were taken and analysed for chromium content by Atomic Absorption Spectrometry. The surface tension of the shake flask cultures was also investigated to detect for any valuable by-products such as biosurfactants for future prospects of developing an economically viable process. Results:Chromium concentration demonstrated an exponential increase between 0-120 h in shake flask experiments. In the presence of B. subtilis SA-6 chromium concentration in cell free supernatant increased from 0.13±0.09 mg/L to 190.81±20.18 mg/L compared to when B. subtilis SA-6 was absent. Surface tension decreased during fermentation from 53.23±0.92 mN/m to 30.13±0.15 mN/m in 24 h. Conclusion:This study demonstrates a waste management process, which detoxifies solid tannery waste to reduce environmental pollution, whilst yielding value-added products (such as biosurfactant) to provide an economically viable bioprocess with potential for large-scale development.

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“…9) This colour is developed by mixing 25 mL of liquid filtrate (obtained after leaching chromite concentrate with distilled water) with 0.5 mL of H 2 SO 4 (1 : 10 dilution) and 0.5 mL of DPC solution. The mixture is then allowed for the red violet colour development for 5 to 10 min.…”

Section: Identifying Cr(vi) Using a Reagentmentioning

confidence: 99%

Application of Terminalia chebula for Removal of Hexavalent Chromium in Chromite Concentrates

Kapure

Rao

2008

ISIJ Int.

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Hexavalent chromium, Cr(VI) presence in chromite concentrate is a concern due to its environmental unfriendly and carcinogenic nature. Chromite concentrates typically contain Cr(VI) in the range of 2.0 to 4.0 mg-Cr/kg. The conventional methods of removing toxic Cr(VI) which includes the use of inorganic reductants are generally not preferred industrially due to their unavoidable environment unfriendly and cost ineffective nature. Therefore, in this study the use of Terminalia chebula, which is a naturally occurring organic product, is explored for Cr(VI) removal in chromite concentrates. The parameters in critical Cr(VI) removal process such as Terminalia chebula dosages, contact time and water requirements for application of this method are estimated and used at plant scale. It was found that 540 g of Terminalia chebula and contact time of 120 s is required for one ton concentrate treatment at plant for minimizing Cr(VI) to trace levels of 0.02 mg-Cr/kg. It was also observed that the water requirements in using Terminalia chebula method are insignificant. The application of Terminalia chebula for removing Cr(VI) in chromite concentrate is found to be suitable method for using in continuous production process of chromite concentrates at plant.

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Determination of total chromium traces in tannery effluents by electrothermal atomic absorption spectrometry, flame atomic absorption spectrometry and UV–visible spectrophotometric methods

Cited by 54 publications

References 21 publications

Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis

Simultaneous speciation of chromium by spectrophotometry and multicomponent analysis

Biosurfactant Production and Biodegradation of Leather Dust from Tannery

Application of Terminalia chebula for Removal of Hexavalent Chromium in Chromite Concentrates

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