Combination of sequential cloud point extraction and hydride generation atomic fluorescence spectrometry for preconcentration and determination of inorganic and methyl mercury in water samples

Han, Zheng; Hong, Jiajia; Luo, Xingling; Li, Shan; Wang, Meixia; Yang, Bingyi; Mei, Wang

doi:10.1016/j.microc.2018.11.057

Cited by 78 publications

(24 citation statements)

References 38 publications

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“… 1 Hg forms are toxic to living things with different toxicological properties. 2 The organic mercury compounds are common and found in different forms. Methyl mercury (CH 3 Hg), as the most common organic mercury, is formed by natural processes and micro-organisms.…”

Section: Introductionmentioning

confidence: 99%

Mercury Removal from Water Using a Novel Composite of Polyacrylate-Modified Carbon

Al-Yaari

Saleh

2022

ACS Omega

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The contamination of groundwater by mercury (Hg) is a serious global threat, and its removal is of great importance. Activated carbon (AC) is considered a very promising adsorbent to remove Hg from water systems. However, specific functional groups can be added to AC to enhance its adsorption efficiency. In this work, AC was synthesized from palm shells and grafted with a copolymer of acrylamide and methacrylic acid to produce a polyacrylate-modified carbon (PAMC) composite. The synthesized adsorbent (PAMC) was characterized by Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), electron dispersive X-ray (EDX) spectroscopy, and Brunauer–Emmett–Teller (BET) analysis. PAMC was then evaluated for Hg removal from aqueous solutions, and the adsorption efficiency was optimized under several parameters (pH, contact time, and PAMC dosage). Kinetic, isotherm, and thermodynamic investigations were performed to gain a further understanding of the adsorption properties. The adsorption data were best fitted by pseudo-second-order and Redlich–Peterson models. Also, the thermodynamic investigation confirmed the spontaneity and the endothermic nature of the Hg adsorption process over PAMC. The maximum adsorption capacity ( q m ) of PAMC was found to be 76.3 mg/g ,which is relatively higher than some activated carbon-based adsorbents. Therefore, PAMC offers a potential promise for wastewater treatment due to its fast and high uptake removal capacity in addition to the cheap and environmentally friendly activated carbon source.

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Section: Introductionmentioning

confidence: 99%

Mercury Removal from Water Using a Novel Composite of Polyacrylate-Modified Carbon

Al-Yaari

Saleh

2022

ACS Omega

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“…Watanabe and Tanaka first developed CPE for the preconcentration of metal ions from aqueous samples [14]. Cloud point extraction principles are based on the separation of the homogeneous micelles aqueous solution into two phases [15][16][17][18][19], a surfactantrich phase, and a dilute aqueous phase [20]. The surfactant-rich phase, of a small volume, including a surfactant analyst composed of a complexing agent with a small amount of water, and the aqueous phase (water-rich phase), contains a low concentration of the surfactant.…”

Section: Introductionmentioning

confidence: 99%

Determination of Trace Nitrite Amounts in Soil by Developed Cloud Point Extraction-Spectrophotometry Method

et al. 2021

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A new and simple method for the selective and sensitive determination of trace amounts of nitrite in soil samples is developed by a combination of cloud point extraction (CPE) and spectrophotometry technique. The procedure is based on the Griess reaction on 3,3`-dimethyl benzidine with nitrite in the presence of 1-naphthol in acidic media to form a yellow diazo dye, which shows absorption at lambda max 455nm. The formation of colored diazo dye is followed by extraction into the Triton X-114rich phase. Cloud point extraction method parameters such as surfactant amount, temperature, and incubation time are evaluated and optimized. The results obtained showed a very good linear range of 10-1250 µgL -1 , with good regression coefficients (R 2 ) ≥ 0.9997 and a preconcentration factor of 12.5. The limit of detection (LOD) describes as 3SDblank/m, and the quantification limit (LOQ) describes as 10SDblank/m, where m is the slope of the calibration curve and they are equal to 7.50 and 22.71 µgL -1 respectively. The recommended method can apply to determine the ultra-trace amount of nitrite in soil samples.

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“…Therefore, preliminary extraction and preconcentration steps are often necessary before instrumental determination. Various separation methods such as solvent extraction, hydride generation, electro-coagulation, precipitation, cloud point extraction and solid-phase extraction (SPE) are employed to extract metal ions [ 13 , 14 , 15 , 16 , 17 ]. SPE is a preferred procedure because of its advantages such as easy operation, the negligible use of organic solvents, complete desorption of analytes, high preconcentration factor, and used in both batch and column modes [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

3D Nanoarchitecture of Polyaniline-MoS2 Hybrid Material for Hg(II) Adsorption Properties

et al. 2020

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We report the facile hydrothermal synthesis of polyaniline (PANI)-modified molybdenum disulfide (MoS2) nanosheets to fabricate a novel organic–inorganic hybrid material. The prepared 3D nanomaterial was characterized by field emission scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction studies. The results indicate the successful synthesis of PANI–MoS2 hybrid material. The PANI–MoS2 was used to study the extraction and preconcentration of trace mercury ions. The experimental conditions were optimized systematically, and the data shows a good Hg(II) adsorption capacity of 240.0 mg g−1 of material. The adsorption of Hg(II) on PANI–MoS2 hybrid material may be attributed to the selective complexation between the–S ion of PANI–MoS2 with Hg(II). The proposed method shows a high preconcentration limit of 0.31 µg L−1 with a preconcentration factor of 640. The lowest trace Hg(II) concentration, which was quantitatively analyzed by the proposed method, was 0.03 µg L−1. The standard reference material was analyzed to determine the concentration of Hg(II) to validate the proposed methodology. Good agreement between the certified and observed values indicates the applicability of the developed method for Hg(II) analysis in real samples. The study suggests that the PANI–MoS2 hybrid material can be used for trace Hg(II) analyses for environmental water monitoring.

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Combination of sequential cloud point extraction and hydride generation atomic fluorescence spectrometry for preconcentration and determination of inorganic and methyl mercury in water samples

Cited by 78 publications

References 38 publications

Mercury Removal from Water Using a Novel Composite of Polyacrylate-Modified Carbon

Mercury Removal from Water Using a Novel Composite of Polyacrylate-Modified Carbon

Determination of Trace Nitrite Amounts in Soil by Developed Cloud Point Extraction-Spectrophotometry Method

3D Nanoarchitecture of Polyaniline-MoS2 Hybrid Material for Hg(II) Adsorption Properties

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