Data processing technique for mercury determination by total-reflection X-ray fluorescence,using amalgamation with gold |
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| Affiliation: | 1. Comisión Nacional de Energı́a Atómica, Centro Atómico Bariloche, 8400 Bariloche, Argentina;2. Universidad Simón Bolı́var, Apartado 89000, Caracas 1080A, Venezuela;1. Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, East Melbourne, Australia;2. Ophthalmology, Department of Surgery, The University of Melbourne, Melbourne, Australia;3. Centre for Ophthalmology and Visual Science (incorporating Lions Eye Institute), The University of Western Australia, and the Department of Ophthalmology, Royal Perth Hospital, Perth, Australia;2. Museo Geológico Nacional José Royo y Gómez, Servicio Geológico Colombiano, Diagonal 53 No. 34-53, Bogotá 11121, Colombia;1. German Federal Institute for Risk Assessment (BfR), Max-Dohrn-Straße 8-10, 10589 Berlin, Germany;2. Institute of Nutritional Science (IEW), University of Potsdam, Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany;1. Department of Epidemiology, School of Public Health, Fudan University, Shanghai, 200032, China;2. Key Laboratory for Health Technology Assessment, National Commission of Health and Family Planning, Fudan University, Shanghai, 200032, China;3. Department of Clinical Laboratory, Anqing Municipal Hospital, Anqing, 246003, China;4. Department of Blood Transfusion, Anqing Municipal Hospital, Anqing, 246003, China;5. Department of Obstetrics and Gynecology, Anqing Municipal Hospital, Anqing, 246003, China;6. Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, 200032, China;1. Fraunhofer Institute for Biomedical Engineering IBMT, Sulzbach, Germany;2. Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany;3. German Environment Agency (Umweltbundesamt), Berlin, Germany;1. School of Earth Sciences, The Ohio State University, Columbus, OH, 43210, USA;2. Global Water Institute, The Ohio State University, Columbus, OH, 43210, USA;3. Department of Obstetrics and Gynecology, University of Rochester School of Medicine and Dentistry, Rochester, NY, 14642, USA;4. Department of Biostatistics and Epidemiology, Rutgers School of Public Health, Environmental and Occupational Health Sciences Institute, Piscataway, NJ, USA;5. Department of Psychiatry, University of Rochester, School of Medicine and Dentistry, Rochester, NY, 14642, USA;6. Department of Neuroscience, University of Rochester, School of Medicine and Dentistry, Rochester, NY, 14642, USA;7. Placental Modulation Laboratory, Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA;8. Placental Analytics LLC, Larchmont, NY, USA;9. Department of Biostatistics and Computational Biology, University of Rochester, Rochester, NY, 14627, USA;10. Departments of Pediatrics, Pathology and Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, 14642, USA |
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| Abstract: | We have developed a method to determine mercury concentrations using total-reflection X-ray fluorescence (TXRF) which leads to reliable results. The usual sample preparation procedure of TXRF is not applicable due to element loss by evaporation on account of its high vapor pressure. The method we developed consists of forming an amalgam on a thin layer of gold affixed in a specular-surface quartz reflector while it is in contact with a mercury ionic solution. Subsequently, a traditional TXRF analysis is performed. Since the mercury and gold peaks overlap, we have developed a data processing scheme to achieve the most precise results. Using a molybdenum anode X-ray tube at 40 kV and 20 mA, the limit of detection achieved for a 10-μl specimen with 2000 s counting time is 250 ppb. |
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