Cloud point microextraction involving graphene oxide for the speciation of very low amounts of chromium in waters

López-Garcı́a, Ignacio; Muñoz-Sandoval, María J.; Hernández‐Córdoba, Manuel

doi:10.1016/j.talanta.2017.05.017

Cited by 38 publications

(8 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Three commonly used TX series nonionic surfactants, TX-45, TX-100, and TX-114, were preliminarily tested to carry out the CPE of the target nanoplastics. The cloud points of these surfactants are approximately 38, 65, and 24 °C, respectively . A CPE procedure as described above was conducted, and the incubation temperature was kept at 75 °C to ensure that all the surfactants reached the cloud points.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The cloud points of these surfactants are approximately 38, 65, and 24 °C, respectively. 21 A CPE procedure as described above was conducted, and the incubation temperature was kept at 75 °C to ensure that all the surfactants reached the cloud points. The results showed that all the above-mentioned surfactants exhibited excellent performance in CPE of nanoplastics, with extraction efficiencies >85.3%, indicating their promising application in the CPE of nanoplastics.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Cloud-Point Extraction Combined with Thermal Degradation for Nanoplastic Analysis Using Pyrolysis Gas Chromatography–Mass Spectrometry

et al. 2018

View full text Add to dashboard Cite

The contamination of micro-and nanoplastics in marine systems and freshwater is a global issue. Determination of micro-and nanoplastics in the aqueous environment is of high priority to fully assess the risk that plastic particles will pose. Although microplastics have been detected in a variety of aquatic ecosystems, the analysis of nanoplastics remains an unsolved challenge. Herein, for the first time, a Triton X-45 (TX-45)-based cloud-point extraction (CPE) was proposed to preconcentrate trace nanoplastics in environmental waters. Under the optimum extraction conditions, an enrichment factor of 500 was obtained for two types of nanoplastics with different compositions, polystyrene (PS) and poly(methyl methacrylate) (PMMA), without disturbing their original morphology and sizes. Additionally, following thermal treatment at 190 °C for 3 h, the CPE-obtained extract could be submitted to pyrolysis gas chromatography−mass spectrometry (Py-GC/MS) analysis for mass quantification of nanoplastics. Taking 66.2 nm PS nanoplastics and 86.2 nm PMMA nanoplastics as examples, the proposed method showed excellent reproducibility, and high sensitivity with respective detection limits of 11.5 and 2.5 fM. Feasibility of the proposed approach was verified by application of the optimized procedure to four real water samples. Recoveries of 84.6−96.6% at a spiked level of 88.6 fM for PS nanoplastics and 76.5−96.6% at a spiked level of 50.4 fM for PMMA nanoplastics were obtained. Consequently, this work provides an efficient approach for nanoplastic analysis in environmental waters.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Cloud-Point Extraction Combined with Thermal Degradation for Nanoplastic Analysis Using Pyrolysis Gas Chromatography–Mass Spectrometry

et al. 2018

View full text Add to dashboard Cite

show abstract

“…After standing for 5 min, the buffer solution was added to increase the pH, and the above described procedure was applied. The signal corresponding to the total chromium ion content allowed the Cr (VI) concentration to be calculated by difference …”

Section: Methodsmentioning

confidence: 99%

Ultrasonic assisted deep eutectic solvent liquid–liquid microextraction using azadipyrromethene dye as complexing agent for assessment of chromium species in environmental samples by electrothermal atomic absorption spectrometry

Panhwar

Tüzen

Deligonul

et al. 2018

Applied Organom Chemis

View full text Add to dashboard Cite

A novel type of solvent named deep eutectic solvent (DES) has been considered as a green ionic liquid analogue. A novel method was developed for enrichment and speciation of chromium ion from water and food samples based on deep eutectic solvent and ultrasonic extraction. The procedure for this method was comprised of Cr(III) complex formation with a hydrophobic complexing agent (Z)-N-(3,5-diphenyl-1H-pyrrol-2-yl)-3,5-diphenyl-2H-pyrrol-2-imine (azadipyrromethene dye). Metal complex was entrapped in a deep eutectic solvent as an extracting solvent. While Cr(III) recovery was quantitative, the recovery of Cr(VI) was found 5%. After reduction of Cr(VI) to Cr(III), the method was applied for determination of total chromium(III) ion. The amount of Cr(VI) was calculated as subtracting of Cr(III) from total chromium ion. Various analytical parameters were optimized. The certified reference materials were analyzed and standard addition method also carried out to real samples to check the accuracy of the developed method. Preconcentration factor was found to be 50. The limit of detection of chromium(III) was found to be 4.3 ng l -1 . The precision of developed method as the relative standard deviation (RSD) was found as 3.5 %. The developed method was applied successfully for the speciation of chromium ions in water and food samples.

show abstract

“…[14][15][16][17][18][19][20][21][22] The fabricated graphene oxide-iron oxide nanocomposites showed high efficiency in the removal of tiny concentrations of chromium ions from water and industrial waste water. [23][24][25][26][27][28] In addition, the zirconium oxide (ZrO 2 ) nanoparticles showed unique electrochemical properties when combined with graphene oxide. [29][30][31][32][33][34][35][36] Compared with the widely used TiO 2 , zirconium oxide (ZrO 2 ) is less expensive and insoluble in water.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide–metal oxide nanocomposites: fabrication, characterization and removal of cationic rhodamine B dye

et al. 2018

View full text Add to dashboard Cite

show abstract

Cloud point microextraction involving graphene oxide for the speciation of very low amounts of chromium in waters

Cited by 38 publications

References 51 publications

Cloud-Point Extraction Combined with Thermal Degradation for Nanoplastic Analysis Using Pyrolysis Gas Chromatography–Mass Spectrometry

Cloud-Point Extraction Combined with Thermal Degradation for Nanoplastic Analysis Using Pyrolysis Gas Chromatography–Mass Spectrometry

Ultrasonic assisted deep eutectic solvent liquid–liquid microextraction using azadipyrromethene dye as complexing agent for assessment of chromium species in environmental samples by electrothermal atomic absorption spectrometry

Graphene oxide–metal oxide nanocomposites: fabrication, characterization and removal of cationic rhodamine B dye

Contact Info

Product

Resources

About