A spectrophotometric method of determination of endosulfan (thiodan) in air |
| |
| Institution: | 1. LEPABE, Department of Chemical Engineering, Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. REQUIMTE–LAQV, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, R. Dr. António Bernardino de Almeida 431, 4200-072 Porto, Portugal;1. Department of Nutrition, Food Chemistry and Toxicology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain;2. Mass Spectrometry Facility, Centro de Investigacion Tecnologica e Investigacion (CITIUS), University of Seville, Spain;3. Department of Analytical Chemistry, Faculty of Chemistry, University of Sevilla. 41012 Sevilla, Spain;4. Department of Biochemistry and Molecular Biology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain;1. Michael-Mueller Ring 29, 55128 Mainz, Germany;2. CNRS-CEMHTI, Site Cyclotron, 3A, Rue de la Ferollerie, 45071 Orleans-Cedex 2, France;3. Institut für Geowissenschaften, Universität Mainz, 55099 Mainz, Germany;4. Kinderfacharzt, Zeppelinstr. 25, 55131 Mainz, Germany |
| |
| Abstract: | Airborne endosulfan is sampled in a train of a microfibre glass or cellulore membrane filter and silica gel, desorbed in methanol and saponified with potassium hydroxide to yield sulphur dioxide. The sulphur dioxide released is spectrophotometrically quantified as a red-purple pararosaniline methyl sulphonic acid produced with acid-bleached para-rosaniline and formaldehyde. The spectrophotometric procedure follows the Beer-Lambert law in the endosulfan concentration range of 2–140 μg and the coefficient of variation (CV) of this method is 6.0%. The sampling efficiency of silica gel for endosulfan vapour at a sampling rate of 1 l. min−1 in the concentration range 0.5-3.0 mg m−3 is found to be 99.8% (CV = 4.9%). The desorption efficiency of methanol for endosulfan trapped in silica gel was measured and found to be 9% (CV = 2.0%). The method is free from interference by atmospheric sulphur dioxide. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
