Sorption equilibrium of phthalate esters on sediment particulates low in organic carbon using solid phase extraction disks

2004 ◽  
pp. 2277-2282
Author(s):  
N Xu ◽  
J Ni ◽  
W Sun
Keyword(s):  
Organic Carbon ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Phthalate Esters ◽  
Phase Extraction ◽  
Sorption Equilibrium

scholarly journals Determination of 11 Phthalate Esters in Beverages by Magnetic Solid-Phase Extraction Combined with High-Performance Liquid Chromatography

2019 ◽  
Vol 102 (5) ◽  
pp. 1624-1631 ◽  
Author(s):  
Shuo Yin ◽  
Yi Yang ◽  
Danni Yang ◽  
Yongxin Li ◽  
Yang Jiang ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Phthalate Esters ◽  
Magnetic Solid Phase Extraction ◽  
Hplc Method ◽  
Phase Extraction ◽  
Established Method ◽  
Strong Adsorption ◽  
Magnetic Solid

Abstract Background: Beverages can be easily contaminated by phthalate esters (PAEs) during the production, bottling, and transportation processes. It is necessary to determine the contamination level in beverages for assessment of human exposure. Objective: In this study, magnetic solid-phase extraction (MSPE) was combined with HPLC for the determination of 11 PAEs in beverages. Methods: Self-synthesized magnetic multiwalled carbon nanotubes (m-MWCNTs) were used as the adsorbent for PAE extraction. To extract the PAEs, an appropriate amount of m-MWCNTs and NaCl was added to the beverage sample. The mixture was mixed on a vortex mixer, the magnetic sorbent was collected with the aid of a magnet, and the supernatant was removed. Then, the analytes were eluted with n-hexane–acetone (1+1, v/v). Finally, the eluent was analyzed by the HPLC method. The separation was accomplished on a Phenomenex Luna-C18 column (250 × 4.6 mm, 5 μm), and the detection wavelength was set at 225 nm. Results: The linear ranges of the method were 2–300 μg/L with correlation coefficients greater than 0.9981. The LOD and LOQ were in the range of 0.659–5.33 × 10–2 μg/L and 2.20–17.8 × 10–2 μg/L, respectively. The recoveries of the method ranged from 79.8 to 114%, with the relative SDs less than 15.8%. The established method has been successfully applied for the determination of 11 PAEs in mineral water, carbonated soft drink, tea beverage, and fruit juice samples. PAEs were detected at 0.246–34.3 μg/L in these samples. Conclusions: The m-MWCNTs are the satisfactory sorbent for MSPE because of their strong adsorption capacity for PAEs. The established MSPE-HPLC method is rapid, easy, sensitive, green, and cost-effective. It can be applied to the analysis of trace PAEs in plastic bottled beverages. Highlights: Three magnetic nanoparticles (MNPs), including Fe3O4 MNPs, m-MWCNTs, and magnetic graphene oxide, were synthesized, and m-MWCNTs were chosen as the sorbent of MSPE for PAE extraction because of their strong adsorption capacity for PAEs. An MSPE–HPLC method has been developed for the analysis of 11 phthalates in plastic bottled beverages. The established method was successfully applied to the analysis of 11 phthalates in four types of beverage samples.

Preparation of magnetic zeolitic imidazolate framework-67 composites for the extraction of phthalate esters from environmental water samples

2020 ◽  
Vol 12 (40) ◽  
pp. 4906-4912
Author(s):  
Qingsong Zhang ◽  
Guangyang Liu ◽  
Xiaolin Cao ◽  
Jungang Yin ◽  
Ziping Zhang
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Phthalate Esters ◽  
Magnetic Solid Phase Extraction ◽  
Environmental Water ◽  
Phase Extraction ◽  
Zeolitic Imidazolate Framework ◽  
Magnetic Solid

In this paper, magnetic ZIF-67 composites were prepared by an in situ method and utilized in the magnetic solid-phase extraction of phthalate esters.

SOLID-PHASE EXTRACTION OF PHTHALATE ESTERS FROM AQUEOUS SAMPLES USING MESOPOROUS SILICA-COATED MULTIWALLED CARBON NANOTUBES AND THEIR DETERMINATION BY HPLC

NANO ◽  
2014 ◽  
Vol 09 (04) ◽  
pp. 1450054 ◽  
Author(s):  
XIAOYING DENG ◽  
XIAOQING CHEN ◽  
XINYU JIANG
Keyword(s):  
Carbon Nanotubes ◽  
Mesoporous Silica ◽  
Solid Phase Extraction ◽  
Multiwalled Carbon Nanotubes ◽  
Solid Phase ◽  
Phthalate Esters ◽  
Phase Extraction ◽  
Aqueous Samples ◽  
Multiwalled Carbon ◽  
Relative Standard

We report a novel solid-phase extraction adsorbent for the preconcentration of three phthalate esters (PAEs) from aqueous samples. The material was obtained by modifying multiwalled carbon nanotubes (MWCNTs) with mesoporous silica. The structural characterization of the adsorbent was conducted by Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM) and N 2 adsorption–desorption measurement, which confirmed the successful coating of mesoporous silica on MWCNTs and the adsorbent possessing large surface and porous structure. The effects of adsorbent amount, type and volume of eluent and sample pH on extraction efficiency were optimized. Following extraction, the PAEs were quantified by high performance liquid chromatography (HPLC). Under optimal conditions, the recoveries ranged from 89.8% to 96.3%. The calibration plot was linear in the 3–1000 ng⋅mL-1 concentration range, with correlation coefficients ranging from 0.9993 to 0.9995. The repeatability of the method, expressed as relative standard deviation (RSD), ranged from 3.8% to 7.7% (for n = 5). Limits of detection (LODs) were between 0.28 ng mL-1 and 0.53 ng⋅mL-1. The relative recoveries (RR) for spiked river water, pond water and tap water samples were in the ranges of 80.9–98.0%, 82.7–96.1% and 88.3–95.5%, respectively. The results showed that the method obviously had a large potential for preconcentration and determination of PAEs in environmental samples.

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