Field Analytical Chemistry & Technology最新文献_第3页

Application of the flow-through analyses of ammonia and calcium in ice core and fresh water by fluorometric detection 荧光检测法在冰芯及淡水中氨、钙流动分析中的应用

Field Analytical Chemistry & Technology Pub Date : 2001-05-02 DOI: 10.1002/fact.1003

Masahiro Maruo, Eiichiro Nakayama, Hajime Obata, Kokichi Kamiyama, Takashi Kimoto

引用次数: 7

An improved automatic analyzer for organic compounds in water based on headspace solid-phase microextraction (SPME) coupled to gas chromatography 基于顶空固相微萃取和气相色谱的水中有机化合物自动分析仪

Field Analytical Chemistry & Technology Pub Date : 2001-05-02 DOI: 10.1002/fact.1004

Eckhard Belau, Christoph Grote, Manfred Spiekermann, Karsten Levsen

{"title":"An improved automatic analyzer for organic compounds in water based on headspace solid-phase microextraction (SPME) coupled to gas chromatography","authors":"Eckhard Belau, Christoph Grote, Manfred Spiekermann, Karsten Levsen","doi":"10.1002/fact.1004","DOIUrl":"10.1002/fact.1004","url":null,"abstract":"An automated analyzer based on solid-phase microextraction (SPME) coupled to gas chromatography (GC) for monitoring organic compounds in water is presented. The instrumental setup, which was tested previously with direct SPME, is now tested in the headspace mode. Memory effects observed in the earlier design were reduced by using glass instead of plastic tubing. Parameters that potentially influence the extraction yield were studied in the laboratory with the use of spiked water samples. These parameters were temperature, salt content, methanol content, pH value, and excess components. The extraction efficiency as a function of the extraction time (absorption profiles) was determined for 24 standard compounds. The method was validated in the laboratory. Good precision (in general <5%) and linearity were observed. With the use of flame ionization, detection limits of quantitation were in the low-ppb range, sufficient for wastewater monitoring. The instrument was tested continuously for 6 days at the wastewater plant of a chemical company in northern Germany. Better stability and robustness were observed in the headspace SPME compared to the direct SPME. © 2001 John Wiley & Sons, Inc. Field Analyt Chem Technol 5: 37–49, 2001","PeriodicalId":100527,"journal":{"name":"Field Analytical Chemistry & Technology","volume":"5 1-2","pages":"37-49"},"PeriodicalIF":0.0,"publicationDate":"2001-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/fact.1004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80782230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Environmental applications of thermal extraction cone penetrometry and ultrafast gas chromatography/mass spectrometry 热萃取锥透法和超快速气相色谱/质谱法的环境应用

Field Analytical Chemistry & Technology Pub Date : 2001-05-02 DOI: 10.1002/fact.1006

Albert Robbat Jr.

{"title":"Environmental applications of thermal extraction cone penetrometry and ultrafast gas chromatography/mass spectrometry","authors":"Albert Robbat Jr.","doi":"10.1002/fact.1006","DOIUrl":"10.1002/fact.1006","url":null,"abstract":"This article describes the collection and analysis of organic contaminants at depth without bringing soil to the surface. A thermal extraction cone penetrometer (TECP) probe was used to extract soil-bound semivolatile organics, transferring them to the surface for analysis by ultrafast gas chromatography/mass spectrometry (GC/MS). Findings showed that polychlorinated biphenyls, polycyclic aromatic hydrocarbons, chlorinated pesticides, and explosives could be collected and analyzed in 5 min when the soil-water content was <20% and in 15 min when it was between 20 and 35%. When the TECP was directly connected to the GC/MS, trinitrotoluene (TNT) and four of its synthetic precursors were speciated in 20 sec. Moreover, 51 VOCs were detected by membrane-inlet mass spectrometry in ∼10 sec. Organics were “sniffed” from a vial and identified using the Ion Fingerprint Detection™ software. The algorithms provide the means to untangle complex mass spectra making real-time, electronic nose detection and identification by MS possible. © 2001 John Wiley & Sons, Inc. Field Analyt Chem Technol 5: 60–68, 2001","PeriodicalId":100527,"journal":{"name":"Field Analytical Chemistry & Technology","volume":"5 1-2","pages":"60-68"},"PeriodicalIF":0.0,"publicationDate":"2001-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/fact.1006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89923665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Speculating about PM-associated urban mortality… 推测pm相关的城市死亡率…

Field Analytical Chemistry & Technology Pub Date : 2001-01-02 DOI: 10.1002/1520-6521(2000)4:6<269::AID-FACT10>3.0.CO;2-I

Henk L.C. Meuzelaar

引用次数: 0

The bubble stripping method for determining dissolved hydrogen (H2) in well water 测定井水中溶解氢(H2)的气泡溶出法

Field Analytical Chemistry & Technology Pub Date : 2001-01-02 DOI: 10.1002/1520-6521(2000)4:6<283::AID-FACT40>3.0.CO;2-V

Daniel M. McInnes, Don Kampbell

{"title":"The bubble stripping method for determining dissolved hydrogen (H2) in well water","authors":"Daniel M. McInnes, Don Kampbell","doi":"10.1002/1520-6521(2000)4:6<283::AID-FACT40>3.0.CO;2-V","DOIUrl":"https://doi.org/10.1002/1520-6521(2000)4:6<283::AID-FACT40>3.0.CO;2-V","url":null,"abstract":"The bubble stripping method was developed for use at field sites to measure the concentration of dissolved hydrogen (H2) in ground water. This information is useful in assessing the viability of employing monitored natural attenuation (MNA) as a strategy to influence the restoration of sites contaminated with chlorinated solvents. In laboratory studies, a reservoir containing water was employed to simulate a well. The system was constructed so that the concentration of dissolved H2 could be maintained at a constant level. The method was applied by pumping water from the reservoir into a sample cell, and then injecting 20 ml of nitrogen into the cell to produce a headspace (the “bubble”). Stripping was accomplished by pumping water through the cell, which produced agitation between the aqueous phase and the headspace. Pumping was continued for a length of time sufficient for dissolved H2 to partition between the two phases. Analysis of H2 in the headspace by gas chromatography enabled the concentration of dissolved H2 in solution to be calculated with the use of Henry's law. Two sample cell designs were compared in this study, the Microseeps Cell and the Chapelle Cell. Kinetics of equilibration studies were conducted with each cell, employing solution flow rates of 200, 300, and 400 ml/min, at 4 and 21 °C. The Microseeps Cell compared favorably with the Chapelle Cell with regards to kinetics of equilibration, with the added benefit of costing significantly less. © 2000 John Wiley & Sons, Inc. Field Analyt Chem Technol 4: 283–296, 2000","PeriodicalId":100527,"journal":{"name":"Field Analytical Chemistry & Technology","volume":"4 6","pages":"283-296"},"PeriodicalIF":0.0,"publicationDate":"2001-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/1520-6521(2000)4:6<283::AID-FACT40>3.0.CO;2-V","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91791872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Monitoring volatile organic compounds in ambient air inside and outside buildings with the use of a radio-frequency-based ion-mobility analyzer with a micromachined drift tube 使用带有微机械漂移管的基于射频的离子迁移率分析仪监测建筑物内外环境空气中的挥发性有机化合物

Field Analytical Chemistry & Technology Pub Date : 2001-01-02 DOI: 10.1002/1520-6521(2000)4:6<297::AID-FACT50>3.0.CO;2-H

G. A. Eiceman, E. G. Nazarov, B. Tadjikov, R. A. Miller

{"title":"Monitoring volatile organic compounds in ambient air inside and outside buildings with the use of a radio-frequency-based ion-mobility analyzer with a micromachined drift tube","authors":"G. A. Eiceman, E. G. Nazarov, B. Tadjikov, R. A. Miller","doi":"10.1002/1520-6521(2000)4:6<297::AID-FACT50>3.0.CO;2-H","DOIUrl":"https://doi.org/10.1002/1520-6521(2000)4:6<297::AID-FACT50>3.0.CO;2-H","url":null,"abstract":"A radio-frequency-based ion-mobility analyzer with a micromachined drift tube was operated continuously to monitor volatile organic compounds (VOCs) in ambient air inside a building and in an open space near the union of I-10 and I-25 at Las Cruces, New Mexico. Air was drawn directly, without enrichment or preseparation, through the analyzer, which was regulated to 35 °C. The ion source was a photo-discharge lamp at 10.6 eV, providing a preliminary level of selectivity in response to chemicals with low ionization potentials. The compensation voltage was scanned continuously from −40 to +20 V at rates of 60 V/s, providing profiles of ions obtained from VOCs in air. Solvents were detected at 1-ppm levels as fugitive emissions from other experiments under way in the laboratory from 8:00 a.m. to 6:00 p.m. However, patterns in VOC levels from 1 to 5 ppb between 6:00 p.m. and 7:00 a.m. and on weekends was attributed to air exchange between ambient air and the ventilation system of the building. The mobility analyzer results were consistent with VOCs from traffic on major city thoroughfare adjacent to the building. In-field studies near two interstate highways demonstrated that analyzer response could be correlated to traffic patterns and exhibited diurnal trends. These findings demonstrate the concept and practice of micromachined mobility analyzers as continuous monitors for VOCs as airborne vapors in buildings and on site. © 2000 John Wiley & Sons, Inc. Field Analyt Chem Technol 4: 297–308, 2000","PeriodicalId":100527,"journal":{"name":"Field Analytical Chemistry & Technology","volume":"4 6","pages":"297-308"},"PeriodicalIF":0.0,"publicationDate":"2001-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/1520-6521(2000)4:6<297::AID-FACT50>3.0.CO;2-H","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91791873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 38

Flow-through analysis of Al in seawater by fluorometric detection with the use of lumogallion 用荧光光度法测定海水中铝的流动

Field Analytical Chemistry & Technology Pub Date : 2001-01-02 DOI: 10.1002/1520-6521(2000)4:6<274::AID-FACT30>3.0.CO;2-U

Hajime Obata, Yoshiyuki Nozaki, Kei Okamura, Masahiro Maruo, Eiichiro Nakayama

引用次数: 17

Statistical treatments for rapid tests with discrete measuring range 离散量程快速试验的统计处理

Field Analytical Chemistry & Technology Pub Date : 2001-01-02 DOI: 10.1002/1520-6521(2000)4:6<270::AID-FACT20>3.0.CO;2-6

Angelika Götzl, Wolfgang Riepe

引用次数: 0

Quiet service from a field measurement technology; Ion mobility spectrometry is used worldwide for on-site analyses and current advances suggest a role in field measurements in the future 安静的服务来自于现场测量技术;离子迁移率光谱法在世界范围内用于现场分析，目前的进展表明在未来的现场测量中发挥作用

Field Analytical Chemistry & Technology Pub Date : 2000-10-25 DOI: 10.1002/1520-6521(2000)4:5<217::AID-FACT1>3.0.CO;2-C

G. A. Eiceman

引用次数: 3

Fundamental considerations for the application of miniature ion mobility spectrometry to field analytical applications 微型离子迁移率光谱法应用于现场分析的基本考虑

Field Analytical Chemistry & Technology Pub Date : 2000-10-25 DOI: 10.1002/1520-6521(2000)4:5<255::AID-FACT5>3.0.CO;2-R

Glenn E. Spangler

{"title":"Fundamental considerations for the application of miniature ion mobility spectrometry to field analytical applications","authors":"Glenn E. Spangler","doi":"10.1002/1520-6521(2000)4:5<255::AID-FACT5>3.0.CO;2-R","DOIUrl":"https://doi.org/10.1002/1520-6521(2000)4:5<255::AID-FACT5>3.0.CO;2-R","url":null,"abstract":"Ion mobility spectrometry (IMS) is a popular field analyzer. The reason for its popularity is its small size, its sensitivity, and the amount of information contained in the ion mobility spectrum. Several research groups are working on smaller IMS cells using microelectromechanical systems (MEMS) technology. New principles of operation will be needed to achieve this goal. The theory supporting the development of the radio frequency (RF) IMS is described. RF-IMS separates ions by applying an asymmetric RF field across two parallel plates and passing the ions through the separator. The performance of the device no longer depends on a simple linear relationship between the drift velocity and an electric field, but rather on a nonlinear relationship between these parameters. Consequently, a more detailed momentum-transfer theory is needed. The required theory is developed and applied to the interpretation of experimental data here. The importance of using momentum transfer theory in combination with the continuity equation is demonstrated. © 2000 John Wiley & Sons, Inc. Field Analyt Chem Technol 4: 255–267, 2000","PeriodicalId":100527,"journal":{"name":"Field Analytical Chemistry & Technology","volume":"4 5","pages":"255-267"},"PeriodicalIF":0.0,"publicationDate":"2000-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/1520-6521(2000)4:5<255::AID-FACT5>3.0.CO;2-R","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91939990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18