The Experts below are selected from a list of 8082 Experts worldwide ranked by ideXlab platform
Sh. Elhami - One of the best experts on this subject based on the ideXlab platform.
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Removal of Malachite green from water samples by cloud point extraction using Triton X-100 as non-ionic surfactant
Environmental Chemistry Letters, 2010Co-Authors: Nahid Pourreza, Sh. ElhamiAbstract:A surfactant mediated cloud point extraction (CPE) procedure has been developed to remove color from wastewater containing Malachite green using Triton X-100 as non-ionic surfactant. The effects of the concentration of the surfactant, temperature and salt concentration on the different concentrations of dye have been studied and optimum conditions were obtained for the removal of Malachite green. The concentration of Malachite green in the dilute phase was measured using UV–Vis spectrophotometer. It was found that the separation of phases was complete and the recovery of Malachite green was very effective in the presence of NaCl as an electrolyte. The results showed that up to 500 ppm of Malachite green can quantitatively be removed (>95%) by CPE procedure in a single extraction using optimum conditions.
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spectrophtometric determination of Malachite green in fish farming water samples after cloud point extraction using nonionic surfactant triton x 100
Analytica Chimica Acta, 2007Co-Authors: Nahid Pourreza, Sh. ElhamiAbstract:Abstract A novel and sensitive cloud point extraction procedure for the determination of trace amounts of Malachite green by spectrophotometry was developed. Malachite green was extracted at pH 2.5 mediated by micelles of nonionic surfactant Triton X-100. The extracted surfactant-rich phase was diluted with ethanol and its absorbance was measured at 630 nm. The effect of different variables such as pH, Triton X-100 concentration, cloud point temperature and time and diverse ions was investigated and optimum conditions were established. The calibration graph was linear in the range of 4–500 ng mL −1 of Malachite green in the initial solution with r = 0.9996 ( n = 10). Detection limit based on three times the standard deviation of the blank (3S b ) was 1.2 ng mL −1 and the relative standard deviation (R.S.D.) for 20 and 300 ng mL −1 of Malachite green was 1.48 and 1.13% ( n = 8), respectively. The method was applied to the determination of Malachite green in different fish farming and river water samples.
Nahid Pourreza - One of the best experts on this subject based on the ideXlab platform.
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Removal of Malachite green from water samples by cloud point extraction using Triton X-100 as non-ionic surfactant
Environmental Chemistry Letters, 2010Co-Authors: Nahid Pourreza, Sh. ElhamiAbstract:A surfactant mediated cloud point extraction (CPE) procedure has been developed to remove color from wastewater containing Malachite green using Triton X-100 as non-ionic surfactant. The effects of the concentration of the surfactant, temperature and salt concentration on the different concentrations of dye have been studied and optimum conditions were obtained for the removal of Malachite green. The concentration of Malachite green in the dilute phase was measured using UV–Vis spectrophotometer. It was found that the separation of phases was complete and the recovery of Malachite green was very effective in the presence of NaCl as an electrolyte. The results showed that up to 500 ppm of Malachite green can quantitatively be removed (>95%) by CPE procedure in a single extraction using optimum conditions.
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spectrophtometric determination of Malachite green in fish farming water samples after cloud point extraction using nonionic surfactant triton x 100
Analytica Chimica Acta, 2007Co-Authors: Nahid Pourreza, Sh. ElhamiAbstract:Abstract A novel and sensitive cloud point extraction procedure for the determination of trace amounts of Malachite green by spectrophotometry was developed. Malachite green was extracted at pH 2.5 mediated by micelles of nonionic surfactant Triton X-100. The extracted surfactant-rich phase was diluted with ethanol and its absorbance was measured at 630 nm. The effect of different variables such as pH, Triton X-100 concentration, cloud point temperature and time and diverse ions was investigated and optimum conditions were established. The calibration graph was linear in the range of 4–500 ng mL −1 of Malachite green in the initial solution with r = 0.9996 ( n = 10). Detection limit based on three times the standard deviation of the blank (3S b ) was 1.2 ng mL −1 and the relative standard deviation (R.S.D.) for 20 and 300 ng mL −1 of Malachite green was 1.48 and 1.13% ( n = 8), respectively. The method was applied to the determination of Malachite green in different fish farming and river water samples.
Pranav Shrotriya - One of the best experts on this subject based on the ideXlab platform.
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effect of receptor attachment on sensitivity of label free microcantilever based biosensor using Malachite green aptamer
Sensors and Actuators B-chemical, 2019Co-Authors: Yue Zhao, Agnivo Gosai, Pranav ShrotriyaAbstract:Abstract Biosensors are often limited by lesser signal/noise ratio in the detection of low concentration target analyte which may be improved by modifying receptor configuration on the transducer. In this study, we report the improvement in sensitivity, through an increment in surface stress signal, due to the attachment/functionalization of Malachite green aptamers with double thiolated ends on microcantilever based sensors, compared to the conventional single thiolated aptamers. Malachite green is deemed to be carcinogenic to humans and its detection using biosensors has been studied by many researchers. Our approach resulted in one order of magnitude improvement in the detection limit for Malachite green, on the same sensor. The improvement is attributed to configurational changes of the aptamer on the cantilever surface, induced by the double thiolated attachment, which results in better propagation of mechanical response upon binding with the target Malachite green, resulting in higher signal.
Vasanth K Kumar - One of the best experts on this subject based on the ideXlab platform.
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equilibrium kinetics and mechanism modeling and simulation of basic and acid dyes sorption onto jute fiber carbon eosin yellow Malachite green and crystal violet single component systems
Journal of Hazardous Materials, 2007Co-Authors: K Porkodi, Vasanth K KumarAbstract:Batch experiments were carried out for the sorption of eosin yellow, Malachite green and crystal violet onto jute fiber carbon (JFC). The operating variables studied are the initial dye concentration, initial solution pH, adsorbent dosage and contact time. Experimental equilibrium data were fitted to Freundlich, Langmuir and Redlich-Peterson isotherm by non-linear regression method. Langmuir isotherm was found to be the optimum isotherm for eosin yellow/JFC system and Freundlich isotherm was found to be the optimum isotherm for Malachite green/JFC and crystal violet/JFC system at equilibrium conditions. The sorption capacities of eosin yellow, Malachite green and crystal violet onto JFC according to Langmuir isotherm were found to 31.49 mg/g, 136.58 mg/g, 27.99 mg/g, respectively. A single stage batch adsorber was designed for the adsorption of eosin yellow, Malachite green and crystal violet onto JFC based on the optimum isotherm. A pseudo second order kinetic model well represented the kinetic uptake of dyes studied onto JFC. The pseudo second order kinetic model successfully simulated the kinetics of dye uptake process. The dye sorption process involves both surface and pore diffusion with predominance of surface diffusion at earlier stages. A Boyd plot confirms the external mass transfer as the rate limiting step in the dye sorption process. The influence of initial dye concentration on the dye sorption process was represented in the form of dimensionless mass transfer numbers (Sh/Sc(0.33)) and was found to be agreeing with the expression:
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biosorption of Malachite green a cationic dye onto pithophora sp a fresh water algae
Dyes and Pigments, 2006Co-Authors: Vasanth K Kumar, V Ramamurthi, S SivanesanAbstract:Abstract Batch sorption experiments were carried out for the removal of Malachite green from its aqueous solution using Pithophora sp., a fresh water algae as biosorbent. Dye uptake was found to increase with contact time and initial Malachite green concentration. Equilibrium uptake was found to be pH dependent and maximum uptake was observed at a pH of 6. The effect of algae concentration on equilibrium uptake was also estimated. The equilibrium data tend to fit Freundlich isotherm equation. Kinetic studies showed that the biosorption process follows first order rate kinetics with an average rate constant of 0.9213 min−1. The study confirms that the fresh water algae can be used as biosorbent for the removal of Malachite green from its aqueous solution. The biosorption process was found to be surface diffusion controlled with an effective diffusion coefficient of 0.011361 cm2/s.
Jose Rodriguez - One of the best experts on this subject based on the ideXlab platform.
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use of modified henequen fibers for the analysis of Malachite green and leuco Malachite green in fish muscle by d spe followed by capillary electrophoresis
Microchemical Journal, 2020Co-Authors: Alexandra T Ferreira, Israel S Ibarra, Luisa M S Silva, Jose M Miranda, Jose RodriguezAbstract:Abstract A novel and simple procedure for the determination of Malachite green (MG) and leuco-Malachite green (LMG) in fish muscle was designed and validated. The method involved the use of henequen fibers modified with copper phthalocyanine as an efficient adsorbent in a dispersive-solid phase extraction technique. Following the extraction and pre-concentration process, CE-DAD was employed to quantify MG and LMG. The structural similarity of MG and LMG and the presence of the cationic forms under acidic conditions are the main drawbacks to determine these analytes in capillary electrophoresis. The proposed methodology allowed for the effective extraction and separation of both analytes using d-SPE-CE-DAD. The experimental parameters of the d-SPE technique were evaluated in order to get the highest pre-concentration efficiency. Under optimum conditions, the methodology achieves a limit of detection of 12.5 μg kg−1 for Malachite green and 5.0 μg kg−1 for leuco-Malachite green. Repeatability and reproducibility (%RSD n = 3) were less than 5.0% RSD in all cases, indicating that the method shows good precision for the analysis of real samples. In order to evaluate the accuracy of the method, the recovery was evaluated in tilapia samples at three concentration levels, recoveries varied from 88.7% to 109.5% for MG and from 65.3% to 88.8% for LMG. The method was validated and successfully applied to determine MG and LMG in fish samples.
