Modification of hydrophobic sorbents by cobalt chloride in order to concentrate low molecular polar organic substances from the air for subsequent gas chromatographic determination

TALANTA

卷:144

Article

Rodinkov, O. V.¹  Zhuravleva, G. A.¹  Bugaichenko, A. S.¹  Viktorova, M. I.¹  Postnov, V. N.¹  Novikov, A. G.¹ 

[1] St Petersburg State Univ, Inst Chem, St Petersburg 199034, Russia

关键词: Cobalt chloride;    Air analysis;    Pre-concentration;    Sorbents;    Surface-layer polytetrafluoroethylene (PTFE);    Volatile organic compounds;   

DOI  :  10.1016/j.talanta.2015.04.069

来源: Elsevier

【 摘 要 】

The article presents a new method of modification of hydrophobic sorbents. To improve sorption pre-concentration of polar organic compounds in the air analysis, these sorbents are coated with cobalt chloride. This modification increases retention volume of lower alcohols by 5-10 fold as compared to that of unmodified sorbents and solves the problem of gas-chromatographic determination at 1-2 ppb (micrograms/m(3)) by using the most common flame ionization detector. It should be noted that the modification of hydrophobic sorbents by cobalt chloride has little influence on their porosimetry parameters (specific surface area, proportions of meso- and micropores) and modified sorbents are capable of retaining hydrophobic nonpolar and weakly polar analytes as well as original unmodified sorbents. Thus, a fairly simple procedure leads to a large positive effect. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free