scholarly journals Carbonized Aramid Fiber as the Adsorbent for In-Tube Solid-Phase Microextraction to Detect Estrogens in Water Samples

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Xiaoxiao Zhu ◽  
Yijun Zhang ◽  
Pengfei Liu ◽  
Xiuzhi Bai ◽  
Na Chen ◽  
...  
Keyword(s):  
Water Samples ◽  
Photoelectron Spectroscopy ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Sampling Rate ◽  
Steel Tube ◽  
Aramid Fiber ◽  
Stainless Steel Tube ◽  
Raman Spectrometry ◽  
Relative Standard

Carbonized aramid fiber was prepared as a new type of adsorbent for in-tube solid-phase microextraction. The surface structure, chemical composition, and graphitization degree of the resulted fiber was determined and characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectrometry. The prepared fiber was packed in a stainless-steel tube instead of the sample loop of a six-port and tested for the extraction of five environmental estrogen hormones coupled with high-performance liquid chromatography. Several parameters affecting the estrogens’ extraction including the sampling volume, sampling rate, NaCl content, and desorption time were investigated in detail. The extraction tube with carbonized aramid fiber exhibited remarkable extraction performance towards five estrogen targets. The analysis method was established, and it exhibited a wide linear range (0.5–10.0 μg/L) with good linearity (correlation coefficient ≥0.9906), low limits of detection (0.011–0.13 μg/L), and high enrichment factors (178–1335) for the five analytes. Relative standard deviations (n = 3) for intraday (≤4.8%) and interday (≤4.0%) tests indicated that the extraction material had satisfactory repeatability. Bisphenol A released from a polycarbonate (PC) bottle was quantitatively detected with a concentration of 8.3 μg/L. The relative recoveries spiked at 5 and 10 μg/L were investigated, and the results were in the range of 74.3–121% for real water samples.

scholarly journals Using Design of Experiments to Optimize a Screening Analytical Methodology Based on Solid-Phase Microextraction/Gas Chromatography for the Determination of Volatile Methylsiloxanes in Water

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3429
Author(s):  
Fábio Bernardo ◽  
Providencia González-Hernández ◽  
Nuno Ratola ◽  
Verónica Pino ◽  
Arminda Alves ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Design Of Experiments ◽  
Water Samples ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Fiber Type ◽  
Good Precision ◽  
Desorption Temperature ◽  
Desorption Time ◽  
Relative Standard

Volatile methylsiloxanes (VMSs) constitute a group of compounds used in a great variety of products, particularly personal care products. Due to their massive use, they are continually discharged into wastewater treatment plants and are increasingly being detected in wastewater and in the environment at low concentrations. The aim of this work was to develop and validate a fast and reliable methodology to screen seven VMSs in water samples, by headspace solid-phase microextraction (HS-SPME) followed by gas chromatography with flame ionization detection (GC-FID). The influence of several factors affecting the extraction efficiency was investigated using a design of experiments approach. The main factors were selected (fiber type, sample volume, ionic strength, extraction and desorption time, extraction and desorption temperature) and optimized, employing a central composite design. The optimal conditions were: 65 µm PDMS/Divinylbenzene fiber, 10 mL sample, 19.5% NaCl, 39 min extraction time, 10 min desorption time, and 33 °C and 240 °C as extraction and desorption temperature, respectively. The methodology was successfully validated, showing low detection limits (up to 24 ng/L), good precision (relative standard deviations below 15%), and accuracy ranging from 62% to 104% in wastewater, tap, and river water samples.

Fiber-Optic Sensor for Aromatic Compounds in Water Based on Solid-Phase Microextraction and Ultraviolet Evanescent Wave Absorption Spectroscopy

1998 ◽  
Vol 52 (1) ◽  
pp. 106-111 ◽  
Author(s):  
Sheila A. Merschman ◽  
David C. Tilotta
Keyword(s):  
Water Samples ◽  
Aromatic Compounds ◽  
Evanescent Wave ◽  
Solid Phase Microextraction ◽  
Matrix Effects ◽  
Solid Phase ◽  
Fiber Optic Sensor ◽  
Wave Absorption ◽  
Relative Standard ◽  
Time Required

A method is described for the determination of aromatic contaminants in water samples that combines solid-phase microextraction and ultraviolet evanescent wave absorption (UV-EWA) spectroscopy. In this method, the aromatic compounds are partitioned from a 10 mL sample of water into the polymer cladding of a 10 cm length of UV-transmitting fiber. The aromatics are then detected directly in the cladding by EWA spectroscopy. The time required for four BTEX compounds to reach concentration equilibrium between the aqueous phase and the cladding ranges from 12 to 80 min, although we show that quantitative determinations can be accomplished in 30 min. Detection limits for these compounds range from 1 to 18 ppm, with relative standard deviations from 3 to 17%. Finally, preliminary work demonstrates that natural water matrices pose no significant matrix effects and that this method shows promise in determining the total aromatic concentrations of water samples contaminated with gasoline.

scholarly journals NH2-MIL-53(Al) Polymer Monolithic Column for In-Tube Solid-Phase Microextraction Combined with UHPLC-MS/MS for Detection of Trace Sulfonamides in Food Samples

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 897 ◽  
Author(s):  
Qian-Chun Zhang ◽  
Guang-Ping Xia ◽  
Jun-Yi Liang ◽  
Xiao-Lan Zhang ◽  
Li Jiang ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Solid Phase Microextraction ◽  
In Situ Polymerization ◽  
Solid Phase ◽  
Monolithic Column ◽  
Metal Organic Framework ◽  
Food Samples ◽  
X Ray ◽  
Polymer Monolithic Column ◽  
Relative Standard

In this study, a novel monolithic capillary column based on a NH2-MIL-53(Al) metal–organic framework (MOF) incorporated in poly (3-acrylamidophenylboronic acid/methacrylic acid-co-ethylene glycol dimethacrylate) (poly (AAPBA/MAA-co-EGDMA)) was prepared using an in situ polymerization method. The characteristics of the MOF-polymer monolithic column were investigated by scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffractometry, Brunauer-Emmett-Teller analysis, and thermogravimetric analysis. The prepared MOF-polymer monolithic column showed good permeability, high extraction efficiency, chemical stability, and good reproducibility. The MOF-polymer monolithic column was used for in-tube solid-phase microextraction (SPME) to efficiently adsorb trace sulfonamides from food samples. A novel method combining MOF-polymer-monolithic-column-based SPME with ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) was successfully developed. The linear range was from 0.015 to 25.0 µg/L, with low limits of detection of 1.3–4.7 ng/L and relative standard deviations (RSDs) of < 6.1%. Eight trace sulfonamides in fish and chicken samples were determined, with recoveries of the eight analytes ranging from 85.7% to 113% and acceptable RSDs of < 7.3%. These results demonstrate that the novel MOF-polymer-monolithic-column-based SPME coupled with UHPLC-MS/MS is a highly sensitive, practical, and convenient method for monitoring trace sulfonamides in food samples previously extracted with an adequate solvent.

Bare polyprolylene hollow fiber as extractive phase for in‐tube solid‐phase microextraction to determine estrogens in water samples

2019 ◽  
Vol 42 (14) ◽  
pp. 2398-2406 ◽  
Author(s):  
Xiangping Ji ◽  
Min Sun ◽  
Chunying Li ◽  
Sen Han ◽  
Xiuqin Wang ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Water Samples ◽  
Solid Phase Microextraction ◽  
Solid Phase
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