Field Analytical Chemistry and Technology最新文献

英文中文

Underwriters sensor laboratory 保险商传感器实验室

Field Analytical Chemistry and Technology

Pub Date : 1997-01-01 DOI: 10.1002/(SICI)1520-6521(1997)1:3<117::AID-FACT1>3.0.CO;2-U

J. Janata

引用次数: 0

Field sampling of trace levels of hydrogen sulfide with the use of solid adsorbent preconcentration 使用固体吸附剂预富集对痕量硫化氢进行现场取样

Field Analytical Chemistry and Technology

Pub Date : 1997-01-01 DOI: 10.1002/(SICI)1520-6521(1997)1:3<145::AID-FACT4>3.0.CO;2-W

I. Dévai, R. Delaune

The trapping efficiency of 14 solid adsorbent tubes for sampling trace level of hydrogen sulfide was quantified. A thermal desorption-gas chromatographic analytical method was developed for the separation and accurate quantitative analysis of hydrogen sulfide collected simultaneously with other reduced volatile sulfur gases. Results demonstrate that silica gel is the best solid adsorbent material for trapping hydrogen sulfide if the sweep gas is dry (or if similar sampling conditions exist). Moderate recovery values were obtained with the use of molecular sieve-type solid adsorbent tubes. The best solid adsorbent material for trapping hydrogen sulfide during normal field sampling conditions when the sampled atmosphere contains moisture is silica gel in conjunction with a calcium chloride drying tube. © 1997 John Wiley & Sons, Inc. Field Analyt Chem Technol 1:145–149, 1997

测定了14根固体吸附剂管对痕量硫化氢取样的捕获效率。建立了一种热解吸-气相色谱分析方法，用于分离和准确定量分析同时收集的硫化氢与其他还原挥发性硫气体。结果表明，当扫气干燥时(或类似取样条件存在时)，硅胶是捕获硫化氢的最佳固体吸附材料。采用分子筛型固体吸附剂管获得了中等的回收率。在正常的现场采样条件下，当采样的大气中含有水分时，捕获硫化氢的最佳固体吸附剂材料是与氯化钙干燥管结合的硅胶。©1997 John Wiley & Sons, Inc化学工程学报(英文版)，1997

引用次数: 12

Performance of commercially available immunoassay-based field test kits for petroleum fuel hydrocarbons in soil 市售的基于免疫分析的土壤中石油燃料碳氢化合物现场测试试剂盒的性能

Field Analytical Chemistry and Technology

Pub Date : 1997-01-01 DOI: 10.1002/(SICI)1520-6521(1997)1:3<135::AID-FACT3>3.0.CO;2-W

L. C. Waters, M. A. Palausky, R. Counts, R. Jenkins

On-site field analytical methods have the potential to reduce the time and cost of assessing and remediating hazardous waste sites. Immunoassay-based methods are rapidly becoming a significant component in the arsenal of field analytical methods. However, the full potential of such alternative analytical methods will not be realized until their effectiveness has been experimentally validated. In this study, the performance of two immunoassay-based test kits for the analysis of petroleum fuel hydrocarbons in soil was evaluated. One kit was used in a semiquantitative format, the other in a quantitative format. The samples analyzed were either solvent or soil spiked with either a mixture of benzene, toluene, ethylbenzene, and the three isomers of xylene (BTEX), or gasoline. Of the 50 assays made with the semiquantitative test, 5 were false positives and 1 was a false negative. A soil matrix effect was observed that could account for false-positive results. Experimental results obtained with the use of the quantitative test with the BTEX mixture (68 assays) correlated well with expected results; R2 values of 0.976–0.983 and slopes of 0.94–0.97 were obtained. With gasoline (38 assays), R2 values of 0.957–0.987 and slopes of 0.76–0.78 were obtained. The lower slopes obtained with gasoline are indicative of the lower immunoreactivity of that particular sample of gasoline relative to the BTEX mixture. © 1997 John Wiley & Sons, Inc. Field Analyt Chem Technol 1:135–144, 1997

现场分析方法有可能减少评估和修复危险废物场址的时间和费用。基于免疫测定的方法正在迅速成为现场分析方法库中的重要组成部分。然而，这种替代分析方法的全部潜力将无法实现，直到其有效性已被实验证实。本研究对两种基于免疫分析法的土壤中石油燃料碳氢化合物分析试剂盒的性能进行了评价。一种试剂盒以半定量形式使用，另一种试剂盒以定量形式使用。分析的样品要么是溶剂，要么是土壤中加入了苯、甲苯、乙苯和三种二甲苯异构体(BTEX)的混合物，要么是汽油。在用半定量测试进行的50次分析中，5次为假阳性，1次为假阴性。观察到土壤基质效应可以解释假阳性结果。使用BTEX混合物(68次分析)进行定量测试获得的实验结果与预期结果相关良好;R2为0.976 ~ 0.983，斜率为0.94 ~ 0.97。汽油(38次)的R2值为0.957 ~ 0.987，斜率为0.76 ~ 0.78。用汽油得到的较低的斜率表明，与BTEX混合物相比，该特定汽油样品的免疫反应性较低。©1997 John Wiley & Sons, Inc化学工程学报(英文版)，1997

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引用次数: 4

Capabilities and limitations of ion mobility spectrometry for field screening applications 离子迁移率光谱法在现场筛选应用中的能力和局限性

Field Analytical Chemistry and Technology

Pub Date : 1997-01-01 DOI: 10.1002/(SICI)1520-6521(1997)1:3<119::AID-FACT2>3.0.CO;2-S

H. Hill, Greg Simpson

The objective of this review is to provide an overview of the capabilities and limitations of ion mobility spectrometry (IMS) as it pertains to field screening. The first section of the review provides a description of the instrument and its operation along with examples of its primary advantages of simplicity, selectivity, and sensitivity. IMS is a simple and potentially inexpensive analytical technique with tunably variable selectivity of response, especially for polar organic compounds, and with sensitivity on the order of 0.1 ppb for most vaporphase compounds. The second section describes the history of IMS as a field-portable technique and discusses some of the difficulties experienced in this capacity. Problems in IMS include competitive ion /molecule reactions, low resolution, a limited dynamic response range, ease of contamination, long residence times in the spectrometer, and concentration-dependent response characteristics. Some of these problems have been solved, while others await further developments in IMS before they cease to limit the utility of IMS in reliable field-portable instruments. Finally, future developments which are needed in order for IMS to reach its full capacity in portable instruments for field monitoring are discussed. These future developments include nontime-of-flight instruments, high-temperature operation, and nonradioactive ionization sources. © 1997 John Wiley & Sons, Inc. Field Analyt Chem Technol 1: 119 ‐ 134, 1997

本文综述了离子迁移谱法(IMS)在现场筛选中的功能和局限性。综述的第一部分介绍了该仪器及其操作，并举例说明了其简单、选择性和灵敏度的主要优点。IMS是一种简单且潜在廉价的分析技术，具有可调的可变响应选择性，特别是对极性有机化合物，对大多数气相化合物的灵敏度约为0.1 ppb。第二部分描述了IMS作为一种现场便携式技术的历史，并讨论了在这种能力中遇到的一些困难。IMS存在的问题包括竞争性离子/分子反应、低分辨率、有限的动态响应范围、易污染、在光谱仪中停留时间长以及浓度依赖的响应特性。其中一些问题已得到解决，而另一些问题则有待于IMS的进一步发展，否则它们将不再限制IMS在可靠的现场便携式仪器中的应用。最后，讨论了为了使IMS充分发挥其便携式现场监测仪器的能力所需要的未来发展。这些未来的发展包括非飞行时间仪器、高温操作和非放射性电离源。©1997 John Wiley & Sons, Inc化学工程学报(英文版)，1997

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引用次数: 113

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