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he vario EL cube

he vario EL cube

Product catalog summary
Introduction
The document discusses the use of the vario EL cube equipped with the vario Liquid Sampler (VLS) for the automated analysis of liquid samples, specifically focusing on CHN (Carbon, Hydrogen, Nitrogen) analysis in organic solvents.

Equipment and Methodology
The vario EL cube series can be enhanced with the VLS for efficient liquid sample analysis. The injection is performed through a septum-free injector port directly into the combustion furnace's hot zone. Hexadecane is used for calibration and daily factor determination. The syringe is rinsed twice with acetone and thrice with the sample liquid before injection. Each sample is analyzed three times with a volume of 8 µl.

Results
The analysis demonstrated high accuracy and precision in determining the CH content of various organic solvents. The results for different solvents are as follows:
  • Iso-octane: C theory 84.12%, C measured 84.14 ± 0.01%; H theory 15.88%, H measured 15.84 ± 0.01%
  • Xylene: C theory 90.51%, C measured 90.44 ± 0.03%; H theory 9.49%, H measured 9.55 ± 0.03%
  • Dodecane: C theory 84.61%, C measured 84.64 ± 0.02%; H theory 15.39%, H measured 15.35 ± 0.02%
  • Toluene: C theory 91.25%, C measured 91.23 ± 0.02%; H theory 8.75%, H measured 8.76 ± 0.03%
  • Ethanol: C theory 52.14%, C measured 52.11 ± 0.01%; H theory 13.13%, H measured 13.15 ± 0.01%
  • Trimethylpentane: C theory 84.12%, C measured 84.19 ± 0.02%; H theory 15.88%, H measured 15.73 ± 0.05%


Recommendations
The VLS method is less labor-intensive compared to the capsule press method, making it suitable for analyzing numerous liquid samples. However, for samples with higher viscosity or frequent transitions between solid and liquid states, the capsule press or vario MAX with crucible technology is recommended.

Conclusion
The vario EL cube with VLS provides a reliable and efficient method for CHN analysis in organic solvents, offering high precision and reduced labor requirements.
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Catalog excerpts

he vario EL cube-1

CHN analysis in solvents using the vario EL cube equipped with the vario Liquid Sampler For the fully automated analysis of liquid samples, all instruments of the vario cube series can be equipped with the vario liquid sampler (VLS). Injection takes place via a septum free injector port directly into the hot zone of the combustion furnace. Different organic solvents have been analysed using the vario EL cube equipped with the vario liquid sampler. Hexadecane has been used for calibration and daily factor determination. For this application, the syringe is automatically rinsed twice with acetone and three times with the sample liquid before injection. instrument: vario EL cube vario Liquid Sampler CHN All samples are analysed three times with a sample volume of 8 µl. The average CH contents and corresponding absolute standard deviations are given below. organic solvents The results show that the CH content of the different organic solvents could be analysed with a very high accuracy and precision. The vario liquid sampler (VLS) is an excellent alternative to the well established capsule press method. When many liquid samples have to be analyzed this method is much less labour intensive. For samples with higher viscosity or a frequent change between solid and liquid mode, the capsule press or the vario MAX with its unique crucible technology is recommended.

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