scholarly journals Determination of Budesonide and Sulfasalazine in Water and Wastewater Samples Using DLLME-SFO-HPLC-UV Method

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1581 ◽  
Author(s):  
Hryniewicka ◽  
Starczewska ◽  
Gołębiewska
Keyword(s):  
Ionic Strength ◽  
Limit Of Detection ◽  
Enrichment Factors ◽  
Aqueous Samples ◽  
Calibration Curves ◽  
Water And Wastewater ◽  
Wastewater Samples ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Dispersive liquid–liquid microextraction based on solidification of floating organic droplet (DLLME-SFO) was applied to isolate budesonide (BUD) and sulfasalazine (SULF) from aqueous samples. The effects of different parameters on the efficiency on the extraction such as type of extrahent and dispersive solvent, ionic strength, pH of sample, and centrifugation time were investigated. Moreover, the influence of foreign substances on a studied process was tested. The calibration curves were recorded. The linearity ranges for BUD and SULF were 0.022–8.611 µg mL−1 and 0.020–7.968 µg mL−1 with the limit of detection (LOD) 0.011 µg mL−1 and 0.012 µg mL−1, respectively. The enrichment factors (EF) for two analytes were high: for BUD it was 145.7 and for SULF, 119.5. The elaborated procedure was applied for HPLC-UV determination of these analytes in water and wastewater samples.

Determination of phthalate esters in seawater of Chabahar Bay using dispersive liquid-liquid microextraction coupled with GC-FID

2017 ◽  
Vol 77 (7) ◽  
pp. 1782-1790 ◽  
Author(s):  
Beheshteh Ajdari ◽  
Mahmoud Nassiri ◽  
Mir Mahdi Zahedi ◽  
Morteza Ziyaadini
Keyword(s):  
Sea Water ◽  
Limit Of Detection ◽  
Phthalate Esters ◽  
Environmental Pollutants ◽  
Enrichment Factors ◽  
Chabahar Bay ◽  
Relative Standard ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Abstract Phthalate esters (PEs), a group of environmental pollutants which are possibly carcinogenic to humans, have been detected in seawater. Seven PEs in seawater were quantitatively determined by using gas-chromatography flame ionizing detection after executing dispersive liquid-liquid microextraction. The suggested method is optimized for microextraction and determination of PEs in artificial sea water. Factors affecting the microextraction procedure such as the type and volume of extracting and dispersive solvents (carbon tetrachloride, 20 μL; methanol, 0.5 mL), extraction time and pH (7) were investigated. Under optimum conditions, the limit of detection of the analytes were obtained between 0.04 and 4.52 μg·L−1, and linearity and linear range were of 0.999 ≥ R2 ≥ 0.994 and 10–560 μg·L−1 respectively. Enrichment factors were found in the range of 761–827 fold, while the relative standard deviations of the analytes were between 0.17 and 7.5% (n = 6) for real sea water samples. Using this method, total PEs content of seawater from several locations in Chabahar Bay (the southeast part of Iran) was estimated 2.33–90.45 μg·L−1.

Determination of Fungicides in Fruit Juice by Ultrasound-Assisted Dispersive Liquid–Liquid Microextraction Based on Solidification of Floating Organic Solvent Droplets Followed by High Performance Liquid Chromatography

2014 ◽  
Vol 97 (1) ◽  
pp. 183-187 ◽  
Author(s):  
Run-Zhen Fan ◽  
Congyun Liu ◽  
Wenqing Jiang ◽  
Xiaonan Wang ◽  
Fengmao Liu
Keyword(s):  
Organic Solvent ◽  
High Performance ◽  
Fruit Juice ◽  
Enrichment Factors ◽  
Wide Range ◽  
Separation And Preconcentration ◽  
Ultrasound Assisted ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Abstract Ultrasound-assisted dispersive liquid–liquid microextraction (UA-DLLME) based on solidification of the floating organic solvent droplets (SFO) combined with HPLC was used for determination of five fungicides in fruit juice samples. 1-Dodecanol, which has a low density and low toxicity, was used as the extraction solvent in UA-DLLME. The solidification of floating organic dropletsfacilitates the transfer of analytes from the aqueous phase to the organic phase. This method was easy, quick, inexpensive, precise, and linear over a wide range. Under the optimized conditions, the enrichment factors for a 5 mL fruit juice sample were 25 to 56, and the LODs for the five fungicides ranged from 5 to 50 μg/L. The average recoveries ranged from 71.8 to 118.2% with RSDsof 0.9 to 13.9%. Application of the DLLME-SFO technique allows successful separation and preconcentration of the fungicides at a low concentration level in fruit juice samples.

scholarly journals Analytical Scheme for Simultaneous Determination of Phthalates and Bisphenol A in Honey Samples Based on Dispersive Liquid–Liquid Microextraction Followed by GC-IT/MS. Effect of the Thermal Stress on PAE/BP-A Levels

2020 ◽  
Vol 3 (1) ◽  
pp. 23 ◽  
Author(s):  
Ivan Notardonato ◽  
Sergio Passarella ◽  
Giuseppe Ianiri ◽  
Cristina Di Fiore ◽  
Mario Vincenzo Russo ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Simultaneous Determination ◽  
Thermal Stresses ◽  
Ion Trap ◽  
Limit Of Detection ◽  
Limit Of Quantification ◽  
Analytical Scheme ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

In this paper, an analytical protocol was developed for the simultaneous determination of phthalates (di-methyl phthalate DMP, di-ethyl phthalate DEP, di-isobutyl phthalate DiBP, di-n-butyl phthalate DBP, bis-(2-ethylhexyl) phthalate DEHP, di-n-octyl phthalate DNOP) and bisphenol A (BPA). The extraction technique used was the ultrasound vortex assisted dispersive liquid–liquid microextraction (UVA-DLLME). The method involves analyte extraction using 75 µL of benzene and subsequent analysis by gas chromatography combined with ion trap mass spectrometry (GC-IT/MS). The method is sensitive, reliable, and reproducible with a limit of detection (LOD) below 13 ng g−1 and limit of quantification (LOQ) below 22 ng g−1 and the intra- and inter-day errors below 7.2 and 9.3, respectively. The method developed and validated was applied to six honey samples (i.e., four single-use commercial ones and two home-made ones. Some phthalates were found in the samples at concentrations below the specific migration limits (SMLs). Furthermore, the commercial samples were subjected to two different thermal stresses (24 h and 48 h at 40 °C) for evidence of the release of plastic from the containers. An increase in the phthalate concentrations was observed, especially during the first phase of the shock, but the levels were still within the limits of the regulations.

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