Determination of chlorinated hydrocarbons in water by headspace gas chromatography

Dietz, Edward A.; Singley, K. F.

doi:10.1021/ac50047a047

Cited by 79 publications

(24 citation statements)

References 14 publications

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“…In the batch air stripping procedure, remaining aqueous concentrations at various time intervals were assayed by the headspace chromatography technique of Dietz and Singley (1979). Essentially, this involves assuming the existence of Henry's law --that if equa l volume samples are placed in i dentical serum bottles, the equilibrated headspaces will contain concentrations uniformly proportiona l to original concentrations in the aqueous samples.…”

Section: Mat Er I Als and Analytical Te Chniquesmentioning

confidence: 99%

The Determination of Henry’s Constant for Volatile Organics by Equilibrium Partitioning in Closed Systems

Lincoff

Gossett

1984

Gas Transfer at Water Surfaces

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Equilibrium Partitioning in Closed Systems (EPICS) is a simple technique proposed for determining the Henry's constants of volatile organics in water. It requires no special apparatus, and obtains results from the measurement of gas concentration ratios so that the preparation of standard curves for determining exact concentrations is not required. Henry's constants for five priority pollutants at 10 to 3o•c were measured with this technique and compared with literature values and with Henry's constants measured in a bubble column. The results indicate that the technique is accurate. In addition, the technique is unencumbered by equilibration problems which limit the utility of other methods for determining Henry's constant.

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Section: Mat Er I Als and Analytical Te Chniquesmentioning

confidence: 99%

The Determination of Henry’s Constant for Volatile Organics by Equilibrium Partitioning in Closed Systems

Lincoff

Gossett

1984

Gas Transfer at Water Surfaces

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“…The purge and trap method is, however, more time-consuming [7,8]. Headspace method is suitable for the analysis of samples with high contents of volatiles [2].…”

Section: Introductionmentioning

confidence: 99%

Headspace liquid-phase microextraction of trihalomethanes in drinking water and their gas chromatographic determination

Zhao

Lao

2004

Talanta

108

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In the present work, a novel method for the determination of trihalomethanes (THMs) such as chloroform, dichlorobromomethane, chlorodibromomethane and bromoform in drinking water has been described. It is based on coupling headspace liquid-phase microextraction (HS-LPME) with gas chromatography-electron capture detector (GC-ECD). A microdrop of organic solvent at the tip of a commercial microsyringe was used to extract analytes from aqueous samples. Three organic solvents-xylene, ethylene glycol and 1-octanol-were compared and 1-octanol was the most sensitive solvent for the analytes. Extraction conditions such as headspace volume, extraction time, stirring rate, content of NaCl and extraction temperature were found to have significant influence on extraction efficiency. The optimized conditions were 15 ml headspace volume in a 40 ml vial, 10 min extraction time and 800 rpm stirring rate at 20 • C with 0.3 g ml −1 NaCl. The linear range was 1-100 g l −1 for THMs. The limits of detection (LODs) ranged from 0.15 g l −1 (for dichlorobromomethane and chlorodibromomethane) to 0.4 g l −1 (for chloroform); and relative standard deviations (RSD) for most of THMs at the 10 g l −1 level were below 10%. Real samples collected from tap water and well water were successfully analyzed using the proposed method. The recovery of spiked water samples was from 101 to 112%.

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“…9 These authors measure the effect of NaCl on the "relative response" for various "salt percentages" in 4 different substances, only one of them being a THM (chloroform). The information is provided in the author's Table 3 which reads at 2.0% of NaCl a relative response of 1.06 and at 5.0% a value of 1.27.…”

Section: Resultsmentioning

confidence: 99%

Determining the Henry’s Law Constants of THMs in Seawater by Means of Purge-and-Trap Gas Chromatography (PT-GC): The Influence of Seawater as Sample Matrix

Ruiz-Beviá

Fernández‐Torres

2010

ANAL. SCI.

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Determination of chlorinated hydrocarbons in water by headspace gas chromatography

Abstract: different silica materials were tested with approximately the same results. At this point, we prefer totally porous spherical packings. Superficially-porous materials can also be drawn into the microcapillaries, but the overall capacity of such columns is very

Cited by 79 publications

References 14 publications

The Determination of Henry’s Constant for Volatile Organics by Equilibrium Partitioning in Closed Systems

The Determination of Henry’s Constant for Volatile Organics by Equilibrium Partitioning in Closed Systems

Headspace liquid-phase microextraction of trihalomethanes in drinking water and their gas chromatographic determination

Determining the Henry’s Law Constants of THMs in Seawater by Means of Purge-and-Trap Gas Chromatography (PT-GC): The Influence of Seawater as Sample Matrix

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