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Rapid method for determination of carbonyl groups in lignin compounds by headspace gas chromatography.

Journal of chromatography. A (2015-06-09)
Jing Li, Hui-Chao Hu, Xin-Sheng Chai
ABSTRACT

The paper reports on a novel method for rapid determination of carbonyl in lignins by headspace gas chromatography (HS-GC). The method involves the quantitative carbonyl reduction for aldehydes in 2min at room temperature or for acetones in 30min at 80°C by sodium borohydride solution in a closed headspace sample vial. After the reaction, the solution was acidified by injecting sulfuric acid solution and the hydrogen released to the headspace was determined by GC using thermal-conductivity detector. The results showed that with the addition of SiO2 powder, the reduction reaction of carbonyl groups can be greatly facilitated. The method has a good measurement precision (RSD<7.74%) and accuracy (relative error <10% compared with a reference method) in the carbonyl quantification. It is suitable to be used for rapid determination of carbonyl content in lignin and related materials.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Sulfuric acid, ACS reagent, 95.0-98.0%
Sigma-Aldrich
Sulfuric acid, puriss. p.a., for determination of Hg, ACS reagent, reag. ISO, reag. Ph. Eur., 95.0-97.0%
Sigma-Aldrich
Nitrogen, ≥99.998%
Sigma-Aldrich
Sulfuric acid, puriss., meets analytical specification of Ph. Eur., BP, 95-97%

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