Evaluation of graphitized carbon black cartridges for rapid organic trace enrichment from water:  application to priority pollutant phenols

Performance of three chemically modified silica materials for solid phase extraction of polar compounds from aqueous solutions Silica gel (320 m 2 g -1 , 10 nm) was chemically modified with 3-chloropropyltrimethoxysilane or 3-aminopropyltrimethoxysilane, followed by reaction with aniline, 3-phenylchloropropylamine, or benzylamine. The resulting silicas were characterized by elemental analysis and spectroscopic techniques, namely diffuse reflectance spectroscopy (DRS), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and 29 Si variable amplitude cross-polarization magic-angle spin nuclear magnetic resonance (VACP-MAS-NMR). The resulting solids were shown to be stable in aqueous and non-aqueous media and were tested as sorbents for pre-concentration of derivatized phenolic compounds (acetyl derivatives of: phenol, o-cresol, m-cresol, p-cresol, 2-ethylphenol, 3-ethylphenol, and 4-ethylphenol) and some organochlorine pesticides (endrin, pentachlorobenzene, heptachloro epoxide, hexachlorobenzene, and lindane) in aqueous media. Extraction experiments were undertaken using a precleaned cartridge (10 cm610 mm ID) packed with modified silica gel and with commercial C-18 in order to evaluate the influence of the nature of the functional group onretention of the compounds under study. Results showed that silica modified with aniline gave the highest retention for the studied acetylated phenolic compounds. Silica modified with 3-phenylchloropropyl groups exhibited the highest retention for hexachlorobenzene and aldrin, while that modified with benzylamine showed the highest retention for eldrin, pentachlorobenzene, and heptachloro epoxide. Lindane was not retained by any of the tested materials.

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“…The temperature program was as reported in Table 1. Compounds identified were confirmed by comparison with literature data [14,15,19]. …”

Section: Chromatographic Analysissupporting

confidence: 56%

Performance of three chemically‐ modified silica materials for solid phase extraction of polar compounds from aqueous solutions

Pizzolato¹,

Foschiera

Benvenutti

et al. 2003

J of Separation Science

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“…Lake water sample was taken from the Lake Tsukui, Kanagawa Prefecture, Japan in Nov. 24,1991. Physicochemical characteristics of the lake water were summerized in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…However, because most of these compounds are present at micrograms per litre (ppb) levels or less in water, a concentration step is necessary prior to the identification of individual contaminants. Conventional techniques used for concentrating organic compounds from the water for analytical purposes include liquid-liquid extraction17-20), active carbon adsorption16, [21][22][23][24][25] …”

Section: Chlorinationmentioning

confidence: 99%

A Simple and Sensitive Method for Detection of Mutagens in Water by a Combination of Solid Phase Extraction and Microsuspension Procedure.

et al. 1993

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SummaryStudies were performed to develop a simple and sensitive method for detection of mutagens in water. The proposed method consists of solid phase extraction using Sep-Pak-tC18 cartridge and mutagenicity test of the cartridge extracts by the microsuspension procedure employing S.typhimurium TA98 and TA100 strains.The cleanup process of Sep-Pak-tC18 cartridge prior to extracting of mutagens from water samples and the eluting procedure of mutagenic materials from the cartridge were very simple in view points of the solvent volumes used and time consumed, as compared with those conducted for XAD resin extraction. In addition, the mutagenic responses in the microsuspension procedure for water concentrates were shown to be ca. 18 times higher than those determined by the ordinary preincubation method.It was confirmed that a combination of Sep-Pak-tC18 cartridge extraction and microsuspension procedure was useful for routine monitoring of mutagens in drinking water and chlorinated lake water.

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“…[24] 10 mg of CNT was sonicated for 15 minutes with 3 ml 0.1 M NaCl in tightly closed centrifuge tubes. After 24 hrs 3 ml pollutant mixture was added, and the tubes were shaken for 3 days in darkness at 293 K to reach equilibrium.…”

Section: Adsorption Isotherms From Dilute Aqueous Solutionsmentioning

confidence: 99%

Competitive adsorption of phenol and 3-chlorophenol on purified MWCNTs

Toth

Törőcsik

Tombácz

et al. 2012

Journal of Colloid and Interface Science

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A commercial multiwall carbon nanotube and its carboxylated derivate (CNTC and COOHC, respectively) was used after purification to study the competitive adsorption of phenol (P) and m-chlorophenol (CP) from 0.1 M aqueous NaCl solutions without external pH control. The adsorption takes place practically exclusively on the external surface of the nanotubes. The uptake of P is suppressed in comparison to its single solute behaviour on both nanotubes, independently of the initial pollutant concentration. The uptake of CP however is more sensitive to the concentration and the surface chemistry of the nanotube. The measured coadsorption isotherms were compared to the isotherms calculated from the competitive Langmuir model (CLM). Preferential adsorption of CP was observed in about 95 % of the relative concentration range. The total adsorption may exceed the corresponding single component sorption capacity.

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Evaluation of graphitized carbon black cartridges for rapid organic trace enrichment from water: application to priority pollutant phenols

Abstract: This is contribution no. ERLN-N019 of the Pacific Division (13) !tumm?Vwr• Morgan^J.' J97Aquatk? Chemistry•, Wiley-Interscience:

Cited by 102 publications

References 14 publications

Performance of three chemically‐ modified silica materials for solid phase extraction of polar compounds from aqueous solutions

Performance of three chemically‐ modified silica materials for solid phase extraction of polar compounds from aqueous solutions

A Simple and Sensitive Method for Detection of Mutagens in Water by a Combination of Solid Phase Extraction and Microsuspension Procedure.

Competitive adsorption of phenol and 3-chlorophenol on purified MWCNTs

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