Quantification of anhydride groups in anhydride‐based epoxy hardeners by reaction headspace gas chromatography

Xie, Wei-Qi; Gong, Yi-Xian; Yu, Kong-Xian

doi:10.1002/jssc.201700298

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…Figure 2 illustrated the temperature effect on the oxidation reaction of carbons with K 2 Cr 2 O 7 after a 40 min reaction time under the optimized conditions (400 μL of 87.5 mmol/L of K 2 Cr 2 O 7 ). Generally, a higher temperature accelerates the chemical reactions [22–24]. It was clear that the reaction was greatly affected by the temperature in this work, and the reaction rate and equilibration rate increased with the increase of equilibration temperature until the equilibration temperature reached 95°C (i.e., peak area no longer increased).…”

Section: Resultsmentioning

confidence: 71%

High‐throughput gas chromatographic analysis of soluble carbon content in tobacco‐related products enabled by phase‐conversion reaction

Xie

Gong

Huang

2020

Separation Science Plus

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This study demonstrated a simple and efficient method for quantifying soluble carbon content in tobacco‐related products using a reaction chromatographic technique. This approach was based on the measurement of the carbon dioxide generated from the oxidation reaction of soluble carbons (i.e., five‐carbon and six‐carbon sugars) in tobacco‐related sample with potassium dichromate in the presence of sulfuric acid, in which soluble carbons were oxidized to carbon dioxide (at 95°C for 40 min). After that, the carbon dioxide was analyzed by gas chromatography. The data illustrated that the proposed approach was precise (RSD < 3.19%) and accurate (relative differences < 9.52%), and the recoveries ranged from 97.9 to 102.3%. The present technique is sensitive, efficient, and could be a potential alternative for the high‐throughput analysis of the soluble carbon content of tobacco‐related products in both laboratory and industrial applications.

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Section: Resultsmentioning

confidence: 71%

High‐throughput gas chromatographic analysis of soluble carbon content in tobacco‐related products enabled by phase‐conversion reaction

Xie

Gong

Huang

2020

Separation Science Plus

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“…In contrast to traditional methods, headspace GC (HS‐GC) is an effective technique for the analysis of volatiles in complex matrices. Several HS‐GC methods have been developed to quantify analyte contents, such as dissolved inorganic carbon in environmental water [10], anhydride groups in anhydride‐based epoxy hardeners [11], softening point of rosin [12], and hydrogen peroxide in pulp bleaching effluents [13]. A pressure‐affected method for determining the CaCO 3 content of paper materials has been proposed [14].…”

Section: Introductionmentioning

confidence: 99%

Determination of carbonate content in barite ore by headspace gas chromatography

Liu

et al. 2022

J of Separation Science

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This paper reports a method for determining the carbonate content in barite ore using headspace gas chromatography. Based on the acidification reaction, the carbonate in the barite ore was converted to CO 2 in a closed headspace vial. When the carbonate content was significant, the pressure caused changes in the CO 2 and O 2 signals and affected the measurement accuracy. It was found that carbonate content is proportional to the intensity ratio of the CO 2 to O 2 signals. Thus, the carbonate content in barite ore can be measured indirectly using a theoretical model. The results showed that the carbonate in 3 g of barite ore sample with a particle size of 74 μm could react completely with a hydrochloric acid solution (2 mol/L) at 65 • C for 5 min. The method described herein had good precision (relative standard deviation < 4.14%) and accuracy (relative differences < 6.12%).

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“…Headspace (HS) GC has been proven to be an efficient tool in quantitatively analyzing volatile substances in the samples having complex matrixes [14][15][16][17][18][19][20]. The main advantage in HS-GC technique is that it can be performed at a precisely controlled temperature [21,22].…”

Section: Introductionmentioning

confidence: 99%

Measurement of water absorption capacity in wheat flour by a headspace gas chromatographic technique

Xie

Gong

2018

J of Separation Science

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The purpose of this work is to introduce a new method for quantitatively analyzing water absorption capacity in wheat flour by a headspace gas chromatographic technique. This headspace gas chromatographic technique was based on measuring the water vapor released from a series of wheat flour samples with different contents of water addition. According to the different trends between the vapor and wheat flour phase before and after the water absorption capacity in wheat flour, a turning point (corresponding to water absorption capacity in wheat flour) can be obtained by fitting the data of the water gas chromatography peak area from different wheat flour samples. The data showed that the phase equilibrium in the vial can be achieved in 25 min at desired temperature (35°C). The relative standard deviation of the reaction headspace gas chromatographic technique in water absorption capacity determination was within 3.48%, the relative differences has been determined by comparing the water absorption capacity obtained from this new analytical technique with the data from the reference technique (i.e., the filtration method), which are less than 8.92%. The new headspace gas chromatographic method is automated, accurate and be a reliable tool for quantifying water absorption capacity in wheat flour in both laboratory research and mill applications.

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Quantification of anhydride groups in anhydride‐based epoxy hardeners by reaction headspace gas chromatography

Cited by 4 publications

References 23 publications

High‐throughput gas chromatographic analysis of soluble carbon content in tobacco‐related products enabled by phase‐conversion reaction

High‐throughput gas chromatographic analysis of soluble carbon content in tobacco‐related products enabled by phase‐conversion reaction

Determination of carbonate content in barite ore by headspace gas chromatography

Measurement of water absorption capacity in wheat flour by a headspace gas chromatographic technique

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