Microfluidic derivatisation technique for determination of gaseous molecular iodine with GC-MS

TALANTA

卷:137

Article

Pang, Xiaobing^1,2  Carpenter, Lucy J.^1,3  Lewis, Alastair C.^1,3 

[1] Univ York, Dept Chem, Wolfson Atmospher Chem Labs, York YO10 5DD, N Yorkshire, England

[2] Nanjing Univ Informat Sci & Technol, Key Lab Aerosol Cloud Precipitat China Meteorol A, Nanjing 210044, Jiangsu, Peoples R China

[3] Univ York, Natl Ctr Atmospher Sci, York YO10 5DD, N Yorkshire, England

关键词: Microfluidic derivatisation technique;    GC-MS;    Gaseous molecular iodine;    Ozonolysis;    Iodide;   

DOI  :  10.1016/j.talanta.2015.01.041

来源: Elsevier

【 摘 要 】

Gaseous molecular iodine (I-2) is an important source of reactive iodine in the marine atmosphere, but the sources of I-2 are not well understood due to the lack of an easily accessible, sensitive and robust technique for analysis. In this study a microfluidic derivatisation technique combined with GC-MS has been developed to measure gaseous I-2. Good linearity in the range of 0.2-416 ppb and low detection limits varying from 6 to 25 ppt for different derivatisation reagents have been achieved, which is a substantial improvement in sensitivity compared with the spectrophotometric method (detection limit of 1.20 ppb) in our previous study [L.J. Carpenter, S.M. MacDonald, M.D. Shaw, R. Kumar, R.W. Saunders, R. Parthipan, J. Wilson, J.M.C. Plane, Nature Geoscience, 6 (2013) 108-1111. The microfluidic technique was employed to quantify I-2 produced from the heterogeneous reactions of potassium iodide solution and ozone. Good agreement was observed between the results of the microfluidic technique and the simulation of a coupled surface water-air kinetic model in the amount of I-2 produced on the ozonolysis of iodide solutions. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.

【 授权许可】

Free