SOL-GEL (3-MERCAPTOPROPYL)TRIMETHOXYSILANE-METHYLTRIMETHOXYSILANE AS ADSORBENT FOR STIR BAR SORPTIVE EXTRACTION OF SELECTED ORGANIC DYES

2016 ◽  
Vol 78 (3-2) ◽  
Author(s):  
Nur Atiqah Abu Bakar ◽  
Wan Aini Wan Ibrahim ◽  
Mohd Marsin Sanagi
Keyword(s):  
Extraction Efficiency ◽  
Organic Dyes ◽  
Limit Of Detection ◽  
Sol Gel ◽  
Stir Bar Sorptive Extraction ◽  
Visible Spectroscopy ◽  
Sorptive Extraction ◽  
Hybrid Silica ◽  
Order Of Magnitude ◽  
Optimum Extraction

A new sol-gel hybrid silica-based (3-mercaptopropyl)trimethoxysilane-methyl-trimethoxysilane (MPTMOS-MTMOS) in the ratio of 3:1 was synthesized and applied as an adsorbent in stir bar sorptive extraction (SBSE) of three selected polar organic dyes from water sample. Three organic dyes were used as test analytes namely crystal violet, methyl orange and methylene blue. Analysis of the organic dyes was performed using ultraviolet-visible spectroscopy. Optimum extraction conditions was achieved using 50 min extraction time, 240 rpm stirring rate, ultrasonic aided desorption for 15 min using  3 mL methanol and sample solution at pH 4 with addition of 5% (w/v) NaCl. The sol-gel hybrid MPTMOS-MTMOS showed better extraction efficiency (based on absorbance) for the selected organic dyes compared to commercial ethylene-glycol/silicone Twister™ stir bar. Limit of detection obtained was in the range 0.34 -0.75 µg mL-1 (S/N = 3) and linear range achieved was 10 order of magnitude (1.0-10 µg mL-1). The developed sol-gel hybrid material showed high potential as an alternative adsorbent for SBSE of organic dyes. MPTMOS-MTMOS SBSE was successfully applied for simultaneous analysis of three organic dyes from river water with good recovery.

Selective and Simultaneous Solid Phase Extraction of Polar and Non–Polar Organophosphorus Pesticides Using Sol–Gel Hybrid Silica–Based Sorbent

2013 ◽  
Vol 62 (3) ◽  
Author(s):  
Wan Aini Wan Ibrahim ◽  
Wan Norfazilah Wan Ismail ◽  
Mohd Marsin Sanagi
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Extraction Efficiency ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Organophosphorus Pesticides ◽  
Sol Gel ◽  
Phase Extraction ◽  
Hybrid Silica ◽  
Hybrid Sorbent

A new sol–gel hybrid silica–based sorbent, methyltrimethoxysilane–cyanopropyltriethoxysilane (MTMOS–CNPrTEOS) produced in our laboratory was used for highly selective and simultaneous solid phase extraction (SPE) of two polar organophosphorus pesticides (OPPs) and four non–polar OPPs from water samples. The two polar OPPs used as test analytes are dicrotophos and methamidophos while the four non–polar OPPs are diazinon, malathion, methidathion, and chlorpyrifos. Analysis of OPPs was performed using gas chromatography–mass spectrometry in scan mode. Extraction efficiency (based on peak area response) of the new sol–gel hybrid MTMOS–CNPrTEOS was superior to commercial C18 SPE sorbent. The new sorbent showed higher selectivity towards the polar dicrotophos and methamidophos and it was also able to simultaneously extract the four non–polar OPPs with higher extraction efficiency. The limit of detection at S/N=3 for the new sol–gel hybrid sorbent is 5–9× lower and similar accuracy for the six OPPs compared to commercial C18 SPE sorbent. The new sol–gel hybrid material showed high potential as an alternative sorbent material for solid phase extraction of OPPs of wide polarity. It was successfully applied to the selective and simultaneous extraction the six OPPs from tap water and lake water samples.

Stir bar sorptive extraction and thermal desorption – gas chromatography/mass spectrometry for determining phosphorus flame retardants in air samples

2018 ◽  
Vol 10 (16) ◽  
pp. 1918-1927 ◽  
Author(s):  
Julius Matsiko ◽  
Honghua Li ◽  
Pu Wang ◽  
Huizhong Sun ◽  
Shucheng Zheng ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Flame Retardants ◽  
Extraction Efficiency ◽  
Single Step ◽  
Stir Bar Sorptive Extraction ◽  
Gas Chromatography Mass Spectrometry ◽  
Air Samples ◽  
Sorptive Extraction ◽  
Sample Extraction

A rapid, single step sample extraction and high extraction efficiency method for determining gaseous phase PFRs in air is demonstrated.

Application of an optimized modified stir bar with ZnS nanoparticles loaded on activated carbon for preconcentration of carbofuran and propoxur insecticides in water samples and their HPLC determination

RSC Advances ◽  
2016 ◽  
Vol 6 (43) ◽  
pp. 36238-36247 ◽  
Author(s):  
Arezou Amiri Pebdani ◽  
Saeid Khodadoust ◽  
Mehdi Akbartabar Toori ◽  
Vahid Zarezade ◽  
Mohammad Sharif Talebianpoor
Keyword(s):  
Ionic Liquid ◽  
Activated Carbon ◽  
Water Samples ◽  
Sol Gel ◽  
Stir Bar Sorptive Extraction ◽  
Hplc Determination ◽  
Zns Nanoparticles ◽  
Sorptive Extraction ◽  
Gel Technique

In this study, the stir bar was coated with the ZnS-NPs loaded on activated carbon (ZnS-AC) as well as [EMIM][PF6] ionic liquid using sol gel technique was used for stir bar sorptive extraction (SBSE) of carbofuran and propoxur.

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