MilliporeSigma
  • Home
  • Search Results
  • Magnetic graphene - polystyrene sulfonic acid nano composite: A dispersive cation exchange sorbent for the enrichment of aminoalcohols and ethanolamines from environmental aqueous samples.

Magnetic graphene - polystyrene sulfonic acid nano composite: A dispersive cation exchange sorbent for the enrichment of aminoalcohols and ethanolamines from environmental aqueous samples.

Journal of chromatography. A (2015-11-12)
Sridhar Chinthakindi, Ajay Purohit, Varoon Singh, Vijay Tak, D K Dubey, Deepak Pardasani
ABSTRACT

Present study aimed at graphene surface modification to achieve selective analyte binding in dispersive solid phase extraction. Magnetic graphene - polystyrene sulfonic acid (MG-PSS) cation exchange nano-composite was prepared by non-covalent wrapping method. Composite was characterized by FT-IR and zeta potential. Material exhibited good dispersion in water and high exchange capacity of 1.97±0.16mMg(-1). Prepared nano-sorbent was then exploited for the cation exchange extraction and gas chromatography mass spectrometric analysis of Chemical Weapons Convention relevant aminoalcohols and ethanolamines from aqueous samples. Extraction parameters such as sorbent amount, extraction time, desorption conditions and sample pH were optimized and effect of common matrix interferences such as polyethylene glycol and metal salts was also studied. Three milligram of sorbent per mL of sample with 20min of extraction time at room temperature afforded 70-81% recoveries of the selected analytes spiked at concentration level of 1μgmL(-1). Method showed good linearity in the studied range with r(2)≥0.993. The limits of detection and limits of quantification ranged from 23 to 54ngmL(-1) and 72 to 147ngmL(-1), respectively. The relative standard deviation for intra- and inter-day precision ranged from 4.6 to 10.2% and 7.4 to 14.8% respectively. Applicability of the method to different environmental samples as well as the proficiency tests conducted by the Organization for the Prohibition of Chemical Weapons (OPCW) was also ascertained.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Triethylamine, ≥99%
Sigma-Aldrich
Hydrogen peroxide solution, 34.5-36.5%
Sigma-Aldrich
Triethylamine, for protein sequence analysis, ampule, ≥99.5% (GC)
Sigma-Aldrich
Triethylamine, puriss. p.a., ≥99.5% (GC)
Sigma-Aldrich
Triethylamine, for amino acid analysis, ≥99.5% (GC)
Sigma-Aldrich
Triethylamine, BioUltra, ≥99.5% (GC)
Sigma-Aldrich
Triethylamine, ≥99.5%
Sigma-Aldrich
Hydrogen peroxide solution, 30 % (w/w) in H2O, contains stabilizer
Supelco
N,O-Bis(trimethylsilyl)trifluoroacetamide with trimethylchlorosilane, with 1% trimethylchlorosilane, for GC derivatization, LiChropur
Sigma-Aldrich
Triethoxysilane, 95%
Sigma-Aldrich
3-Quinuclidinol, 99%
Sigma-Aldrich
Triethylamine, ≥99.5%
Sigma-Aldrich
Hydrazine hydrate, reagent grade, N2H4 50-60 %
Sigma-Aldrich
N,N-Diethylaniline, ≥99%
Sigma-Aldrich
Hydrogen peroxide solution, contains potassium stannate as inhibitor, 30-32 wt. % in water, semiconductor grade, 99.999% trace metals basis
Sigma-Aldrich
2-(Diisopropylamino)ethanol, ≥99%
Sigma-Aldrich
Potassium permanganate, ACS reagent, ≥99.0%
Sigma-Aldrich
Potassium permanganate, ≤150 μm particle size, 97%
Sigma-Aldrich
Potassium permanganate, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99%
Sigma-Aldrich
Potassium permanganate, ACS reagent, ≥99.0%, low in mercury
Sigma-Aldrich
Hydrogen peroxide solution, contains ~200 ppm acetanilide as stabilizer, 3 wt. % in H2O
Sigma-Aldrich
Hydrogen peroxide solution, 50 wt. % in H2O, stabilized
Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 35 wt. % in H2O
Sigma-Aldrich
Potassium permanganate, puriss. p.a., ACS reagent, Hg ≤0.000005%, ≥99.0% (RT)
Sigma-Aldrich
Hydrogen peroxide solution, purum p.a., ≥35% (RT)
Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 30 wt. % in H2O, ACS reagent
Sigma-Aldrich
Hydrogen peroxide solution, contains inhibitor, 30 wt. % in H2O, meets USP testing specifications
Sigma-Aldrich
Hydrazine monohydrate, N2H4 64-65 %, reagent grade, 98%
Sigma-Aldrich
Triethanolamine, reagent grade, 98%
Sigma-Aldrich
N,O-Bis(trimethylsilyl)trifluoroacetamide, ≥99%