利用透视ATR对异物进行FTIR分析

有各种FTIR方法可用于识别异物或污染物。FTIR显微镜用于尺寸在几微米量级的异物，但当可以用肉眼观察到含有异物的样品时，颗粒通常大于几百微米，不需要FTIR显微镜。宏观ATR方法可能是一种合适的替代方法，并具有最少的样品制备、无损测量和易于处理等优点。高质量ATR测量的一个关键要求是样品和ATR棱镜之间的完全接触。在常规ATR附件的情况下，用户不能确保棱镜是否与外来污染物直接接触。JASCO最新的FTIR配件ATR PRO ONE VIEW提供了与ATR棱镜接触的样品区域的实时可视化。这一特性对于测量纸张、塑料和金属等不透明基材上的异物非常有效。Application Note070ATO245 2/2 Observation and Measurement of Foreign Materia l Analysis using ATR PRO ONE VIEW Introduc t ion There are various FTIR met h ods that can be used to i den t ify fore i gn material or contami n ants.FTIR m i c r oscopy is used for foreign mate r i al where the size i s i n the order of few m i c r o n s， but when a samp l e with foreign ma t er i a l can be observed by the naked eye， the particle typically is typical l y greater than several hundred microns a n d does not r equire an FTIR microscope. A macro ATR method may be a suitable alternative a n d offers advantages such as minimal sample preparation， non-destructive measu r eme n t and easy-handl i ng . A key r equi r ement f or high quality ATR measure m e n t is f u ll contact between the sample and ATR pr i sm. In t h e case of a convent i o n a l ATR accessory， the user can n ot ensure whether the prism is in direct contact with t h e foreign contami n a n t or n ot. JASCO's l atest metal. ATR PRO ONE VIEW FTIR accessory， the ATR PRO ONE VIEW prov i des real-time visualization of the sample area in contact wit h ATR prism .This feature i s highly effective for the measurement of fore i gn materials on opaque substrates such as paper， plastic and This application n ote shows an exam p le of analysi s of a f oreign material using the ATR PRO ONE VIEW. Sample Foreign material， paper， ATR Instrument FT/IR-4600 Method ATR Detector DLATGS Accumulation 50 Resolution 4cm² Prism Diamond Keyword s ATR， foreign mate r ial， F T IR， cellulose， paper analysi s ， polyester， image analysis Observat i on and Measurement of Foreign Appl i c a t i on Note Mate r ial Analysis using ATR PRO ONE VIEW Figure 1 shows the picture of the sample. Figure 2 shows the observation image of the target in full contact with t he prism. Figure 1. Op t i c al i ma g e o f f oreign ma teri a l o n p a p er Figure 2. S a m p le i m ag e u s i ng A TR PRO ON E VIE W R esul t Figure 3 shows the spect r a of paper and foreign mate r ia l on paper. I n the upper spectrum， the O-H peak (a r ound 3300cml) and C-O-C peak (a r ound 1000 cml) conf i rmed that the mai n component is cel l ulose. In the l ower spect r um， C-H peak (around 2900 cml ) and C=O peak (around 1720 cm-) are not attr i buted to cellulose. In order to i dentify the foreign mater i a l ， the subtraction spectrum was calcu l ated and searched t h rough a spectra l database identifying the foreign material as polyester. Figure 3. S p ect r a of p ap e r (u p p e r )and fo r eign ma t e r ia l a t tac h ed pa pe r (lo w e r )*v e r t ical a x i s is o f fs et Figure 4. D a ta b ase s e arc h r e sult of subt r act i o n of sp e c t ra JASCO USA 28600 Mary's Cour t ， E a s to n ， M D 21601US A T el ： (800) 333-5272 F ax： (410) 822-7526A ppl ic a tio n Lib r ary： ja s c o i n c.com /appli c a t i o ns