Estimation of BTEX in groundwater by using gas chromatography–mass spectrometry

Kamal, Mohammad Amjad; Klein, Peter

doi:10.1016/j.sjbs.2010.04.002

Cited by 13 publications

(5 citation statements)

References 6 publications

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“…15 Estimation of BTEX in groundwater using a combination of gas chromatography and mass spectrometry was also reported. 16 Although these methods are capable of accurately quantifying BTEX compounds, there are several drawbacks associated with these techniques. For instance, while Raman spectroscopy 15 can be made field-deployable, its portable version lacks the necessary detection limits for BTEX compounds (i.e., BTEX detection limits are relatively high on the order of several ppm).…”

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confidence: 99%

“…The conventional techniques used to detect and quantify BTEX compounds involve either spectroscopy or gas chromatography. , Examples include infrared evanescent field spectroscopy − and Raman spectroscopy . Estimation of BTEX in groundwater using a combination of gas chromatography and mass spectrometry was also reported . Although these methods are capable of accurately quantifying BTEX compounds, there are several drawbacks associated with these techniques.…”

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confidence: 99%

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Obtaining Chemical Selectivity from a Single, Nonselective Sensing Film: Two-Stage Adaptive Estimation Scheme with Multiparameter Measurement to Quantify Mixture Components and Interferents

et al. 2018

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A new approach is reported to detect and quantify the members of a group of small-aromatic-molecule target analytes: benzene, toluene, ethylbenzene, and xylenes (BTEX), dissolved in water, in the presence of interferents, using only the data collected from a single polymer-coated SH-SAW (shear horizontal surface acoustic wave) device and a two-stage adaptive estimation scheme. This technique is composed of exponentially weighted recursive least-squares estimation (EW-RLSE) and a bank of Kalman filters (BKFs) and does not require any prior knowledge of the initial concentration range of the target analytes. The proposed approach utilizes the transient sensor response to sorption and/or desorption of the analytes as well as the error range associated with the response time constants to provide more information about the analyte-specific interactions with the polymer film. The approach assumes that the sensor response to contaminated groundwater is a linear combination of the responses to the single target analytes, the interferents that interact with the selected polymer sensor coatings, and measurement noise. The proposed technique was tested using actual sensor responses to contaminated groundwater samples containing multiple BTEX compounds with concentrations ranging from 10 to 2000 parts per billion, as well as common interferents including ethanol, 1,2,4-trimethylbenzene, naphthalene, n-heptane, and MTBE (methyl tert-butyl ether). Estimated concentration values, accurate to ±10% for benzene/toluene and ±15% for ethylbenzene/xylenes, are obtained in near-real time. The utilization of sorption and/or desorption data enables detection and quantification of BTEX compounds with improved accuracy, high tolerance to measurement noise, and improved chemical selectivity.

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Obtaining Chemical Selectivity from a Single, Nonselective Sensing Film: Two-Stage Adaptive Estimation Scheme with Multiparameter Measurement to Quantify Mixture Components and Interferents

et al. 2018

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“…A large number of studies related to Fenton-based methods have been carried out at room temperature [39,[75][76][77]. This is because thermal decomposition of H 2 O 2 occurs at temperatures above 50°C [78][79][80][81][82][83][84]. In addition, due to the fact…”

Section: Temperaturementioning

confidence: 99%

“…that H 2 O 2 decomposition is accelerated at basic pH values, the increment in temperature brings about a shift in optimum pH towards acidic values [39,75,80]. In fact, a study [71] reported an optimum temperature of 30°C, whereas another study [55] reported that the degradation efficiency is unaffected even when the temperature is increased from 10 to 40°C.…”

Section: International Journal Of Environmental Sciences and Natural Resourcesmentioning

confidence: 99%

Advances in Fenton and Fenton Based Oxidation Processes for Industrial Effluent Contaminants Control-A Review

Matavos-Aramyan¹

2017

IJESNR

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This paper reviews the main advances in Fenton and Fenton-based systems as oxidation processes for environmental pollution abatement in three parts. The increase in the disposal of refractory organics demands for newer technologies for the complete mineralization of these wastewaters. Fenton reaction is an advanced oxidation process which has gained wide spread acceptance for higher removal efficiency of recalcitrant organic contaminants under wide range of operational conditions. However, the requirement of strict acidic conditions to prevent iron precipitation still remains the bottleneck for iron-based Fenton and Fenton-based processes.The first part of this paper presents a literature review of the various Fenton reagent reactions which constitute the overall kinetic scheme with all possible side reactions. The second part presents a general review on Fenton and Fenton-based processes developed to degrade organic pollutants. Also fundamentals and main applications of typical methods such as Fenton, electro-Fenton, photo-Fenton, sonophoto-Fenton, sono-electro-Fenton and photo-electro-Fenton are discussed. The last part of this paper presents a review of alternative noniron Fenton catalysts and their reactivity towards hydrogen peroxide activation. Elements with multiple redox states, all directly decompose hydrogen peroxide into hydroxyl radicals through conventional Fenton-like pathways. This part of the present paper also highlights limitations influencing their environmental applications.

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“…Benzene, toluene, ethyl benzene and xylene (BTEX) are widespread pollutants of which the main source in the outside environment is vehicle traffic and indoor the cigarette smoke. They are also present in small quantities in drinking water and food, in painting substances or adhesives [3].…”

Section: Introductionmentioning

confidence: 99%

Chemometrics Optimization of Volatile Organic Compounds Analysis in Water by Static Headspace Gas Chromatography Mass Spectrometry

Fatemi

Kouchakpour²,

Malekzadeh³

2013

Hydrol Current Res

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Static headspace coupled with gas chromatography-mass spectrometry was applied to extraction and analysis of volatile organic compounds in water samples. The effects of various factors affecting on the extraction efficiency including: the extraction temperature, extraction time, salt concentration and stirring speed were carried out by means of a 2 4 full factorial design. It was found that the effects of extraction temperature and salt concentration were significant. Then, a central composite design was performed to optimize the level of these factors. The optimal headspace conditions were achieved when the vials were heated under 88°C and 29% w/w addition of salt. At optimum operating conditions, analytical figures of merit of method such as linearity (0.9962-0.9996), repeatability (1.2-12.13%), detection limits (0.1-4.9 μg.L −1 ) and linearity dynamic range (10-1000 μg.L −1 ) were determined. The proposed methods can be used to direct investigation of the presence of Volatile organic compounds in environmental samples without pre-treatment of samples. Finally the optimized method was used to investigate the existence of volatile organic compounds in Babolroud River in the north of Iran.

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Estimation of BTEX in groundwater by using gas chromatography–mass spectrometry

Cited by 13 publications

References 6 publications

Obtaining Chemical Selectivity from a Single, Nonselective Sensing Film: Two-Stage Adaptive Estimation Scheme with Multiparameter Measurement to Quantify Mixture Components and Interferents

Obtaining Chemical Selectivity from a Single, Nonselective Sensing Film: Two-Stage Adaptive Estimation Scheme with Multiparameter Measurement to Quantify Mixture Components and Interferents

Advances in Fenton and Fenton Based Oxidation Processes for Industrial Effluent Contaminants Control-A Review

Chemometrics Optimization of Volatile Organic Compounds Analysis in Water by Static Headspace Gas Chromatography Mass Spectrometry

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