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A novel colorimetric method for field arsenic speciation analysis

Journal of Environmental Sciences 2012年第7期24卷 1341-1346页

作者： Shan Hu Jinsuo Lu Chuanyong Jing State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environmental and Municipal Engineering Xi'an University of Architecture and TechnologyXi'an 710055China

Accurate on-site determination of arsenic （As） concentration as well as its speciation presents a great environmental challenge especially to developing countries. To meet the need of routine field monitoring, we developed a rapid colorimetric method with a wide dynamic detection range and high precision. The novel application of KMnO4 and CHaN2S as effective As（III） oxidant and As（V） reductant, respectively, in the formation of molybdenum blue complexes enabled the differentiation of As（III） and As（V）. The detection limit of the method was 8 ~tg/L with a linear range （R2 = 0.998） of four orders of magnitude in total As concentrations. The As speciation in groundwater samples determined with the colorimetric method in the field were consistent with the results using the high performance liquid chromatography atomic fluorescence spectrometry, as evidenced by a linear correlation in paired analysis with a slope of 0.9990- 0.9997 （p 〈 0.0001, n = 28）. The recovery of 96%-116% for total As, 85%-122% for As（III）, and 88%-127% for As（V） were achieved for groundwater samples with a total As concentration range 100-800 μg/L. The colorimetric result showed that 3.61 g/L As（III） existed as the only As species in a real industrial wastewater, which was in good agreement with the HPLC-AFS result of 3.56 g/L As（Ⅲ）. No interference with the color development was observed in the presence of sulfate, phosphate, silicate, humic acid, and heavy metals from complex water matrix. This accurate, sensitive, and easy-to-use method is especially suitable for field As determination.

关键词： arsenic speciation colorimetric method groundwater field analysis

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Method for rapid on-site identification of VOCs

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Journal of Environmental Sciences 2009年第7期21卷 1005-1008页

作者： Justin D Fair William F Bailey Robert A Felty Amy E Gifford Benjamin Shultes Leslie H Volles Department of Chemistry University of Connecticut Storrs Connecticut 06269-3060 USA. INFICON Inc. 2 Technology Place East Syracuse New York 13057 USA

Rapid on-site identification of volatile organic compounds （VOCs） in ambient air is an important first step in remediation efforts. This study describes modification of a commercially available, portable GC/MS system and development of an analysis protocol for rapid （〈 3 min） sampling and identification of VOCs typically found at contaminated sites at the low ppbv level.

关键词： field analysis gas chromatograph mass spectrometer toxic industrial chemicals thermal desorption

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Rapid on-site identification of hazardous organic compounds at fire scenes using person-portable gas chromatography-mass spectrometry(GC-MS)—part 1:air sampling and analysis

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Forensic Sciences Research 2020年第2期5卷 134-149页

作者： Rylee Lam Chris Lennard Graham Kingsland Paul Johnstone Andrew Symons Laura Wythes Jeremy Fewtrell David O’Brien Val Spikmans School of Science and Health Western Sydney UniversityPenrithAustralia Fire&Rescue NSW Fire Investigation and Research UnitGreenacreAustralia Operations Capability Directorate Fire&Rescue NSWGreenacreAustralia Environment Protection Science Branch Office of Environment and HeritageLidcombeAustralia Hazardous Incidents and Environmental Health Branch New South Wales Environment Protection AuthoritySydneyAustralia Strategic Capability Fire&Rescue NSWGreenacreAustralia

Recent advancements in person-portable instrumentation have resulted in the potential to provide contemporaneous results through rapid in-field analyses.These technologies can be utilised in emergency response scenarios to aid first responders in appropriate site risk assessment and management.Large metropolitan fires can pose great risk to human and environmental health due to the rapid release of hazardous compounds into the atmosphere.Understanding the release of these hazardous organics is critical in understanding their associated risks.Person-portable gas chromatography-mass spectrometry(GC-MS)was evaluated for its potential to provide rapid on-site analysis for real-time monitoring of hazardous organic compounds at fire scenes.Air sampling and analysis methods were developed for scenes of this nature.Controlled field testing demonstrated that the portable GC-MS was able to provide preliminary analytical results on the volatile organic compounds present in air samples collected from both active and extinguished fires.In-field results were confirmed using conventional laboratory-based air sampling and analysis procedures.The deployment of portable instrumentation could provide first responders with a rapid on-site assessment tool for the appropriate management of scenes,thereby ensuring environmental and human health is proactively protected and scientifically informed decisions are made for the provision of timely advice to stakeholders.

关键词： Forensic sciences gas chromatography-mass spectrometry portable GC-MS air pollution fire volatile organic compounds field analysis needle trap

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