Comparison of different methods for the determination of volatile organic compounds in water samples

A non-linear asymmetric error function-based least mean square approach for the analysis of multicomponent mass spectra measured by membrane inlet mass spectrometry

“…[26][27][28][29][30][31] Briefly, the mass spectrometer used was a residual gas analyzer type of quadrupole mass spectrometer (Balzers QMG 421C, Balzers Aktiengesellschaft, Balzers, Liechtenstein) with a mass range of 1 to 500 u. The instrument was equipped with an open cross-beam electron impact (70 eV) ion source.…”

“…[26][27][28][29][30][31] Most importantly the performance of the MIMS method with the NALMS method has been validated by comparing the results obtained with this combination for spiked and authentic water samples with the results of the same samples obtained by standard methods for analyzing VOCs in water samples, static head space gas chromatography (HSGC) and purge&trap gas chromatography/mass spectrometry (P&T-GC/MS). 26 The results reported showed that MIMS is as effective as HSGC and P&T-GC/MS for analyzing VOCs in water samples. Terpene analyses by MIMS combined with the NALMS method has also given results comparable with the analysis of the same industrial water samples by HSGC.…”

“…The NALMS method has already been successfully used in many practical applications, such as on-line analysis of environmentally significant VOCs from industrial water samples, analysis of sulfur compounds from water and air samples and analysis of air samples from a paint shop. [26][27][28][29][30][31] In this paper the NALMS approach is described and its testing results are presented in detail. In addition, some of the results obtained in practical applications are discussed.…”

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

“…Static or dynamic headspace gas chromatography (GC) analysis is the most adopted methods used by environmental agencies to determine VOCs from solid and liquid matrices [13]. However, direct aqueous injection (DAI) [14], liquid-liquid extraction (LLE) [14], membrane techniques, solid-phase extraction (SPE), solid-phase micro extraction (SPME) [8,15] and distillation techniques are also used as sample preparation techniques in analysis of VOCs. A primary benefit of using headspace GC is that one can analyze small amounts of analytes buried in a large amount of matrix without having to inject the matrix into the chromatography column.…”

“…This technique results in clean, easy sample preparation coupled with less wear on the chromatography columns and the GC instrument. The static headspace (SHS) technique presents a wide linear dynamic range (with a limit of detection of up to 100 mg.L −1 ) [15], simpler instrumentation [8,9], good repeatability (coefficient of variation 4-10%) and high recuperation [15][16][17].…”