What is a mull?. a mull a suspension of solid sample in mineral oilIt is used to make a thin-film cell from a solid sample. Thin film IR cells. Salt (NaCl) discs are usedTo hold the sampleSo the holder won\'t absorb infrared lightand only sample absorption is detected. Sample preparation. so dry the sample wellbecause water etches the IR discsand emulsifies with oil letting less light through.
IR sample preparation
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