Deterioration of sample

Katrul's picture

I want to do measurement using two different NIR instrument and FT-IR for a same sample (oil). What i've been observe when a sample is used for measurement, sometimes it got a bit hotter. I've read on sample temperature that a few degrees difference can change the spectral data.If the same sample is used for three different measurement, does this sample deteriorate? I am please to hear opinions on this matter. Thanks.