手持式迁移谱仪在制造业传感器中的应用。

G Allinson
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引用次数: 11

摘要

离子迁移谱仪(IMS)是一种体积小、重量轻、非常坚固的设备,功率要求低,没有活动部件,对气体或真空没有绝对要求,可以在环境温度和压力下工作,并且能够测量非常低水平(亚杯/升)的有机化学品的气相浓度。IMS能够分析复杂的混合物并产生简单的光谱输出。挥发性组分通过化学电离在光谱仪中产生可测量的负离子和正离子产物。产生的光谱本质上是目标分子/混合物的气相指纹图谱。如果仪器的响应在这些仪器的线性动态范围内,就可以获得定量数据,但是IMS的大多数实际应用都是以定性的方式使用该技术,只需要高于/低于阈值或正/负响应。在制造业中,原料的香气/气味对安全或产品质量有影响的例子很多。IMS的发展不是为了取代传统的分析方法,例如GC/MS或感官面板,而是为了提供快速,定性的响应,补充更成熟的方法。本文报道了使用手持式离子迁移谱仪来表征挥发性有机化合物、新鲜草药和零售香料混合物在室温和常压下产生的蒸汽。结果表明,通过监测两种离子采集模式,离子迁移谱仪能够区分广泛的产品。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of hand-held mobility spectrometers as sensors in manufacturing industries.

Ion mobility spectrometers (IMS) are small, lightweight, extremely robust devices with low power requirements, no moving parts, no absolute requirement for gases or vacuums, that can be operated at ambient temperatures and pressures, and yet are capable of measuring vapour phase concentrations of organic chemicals at very low levels (sub-mug/l). IMS are capable of analysing complex mixtures and producing a simple spectral output. Volatile components produce measurable negative and positive product ions in the spectrometer through chemical ionization. The spectra produced are essentially the vapour phase fingerprints of the target molecules/mixture. Quantitative data can be obtained provided instrument response is within the linear dynamic range of these instruments, but most practical applications of IMS have used the technology in a qualitative manner in situations which require just an above/below threshold or positive/ negative response.In the manufacturing industry there are many examples where the aroma/odour of raw materials has safety or product quality implications. IMS was not developed to replace traditional methods of analysis, e.g. GC/MS or sensory panels, but rather to provide a rapid, qualitative response complementary to more established methods. This paper reports on the use of a hand-held ion mobility spectrometer to characterize the vapours produced by volatile organic compounds,fresh herbs and retail spice mixtures at ambient temperature and pressure. The results show that by monitoring in both ion acquisition modes, ion mobility spectrometers are capable of discriminating between a wide range of products.

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