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IR sample preparation for pure liquid samples. What is a thin film cell? a thin film cell a thin film cell is a drop of pure liquid sample is a drop of.

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Presentation on theme: "IR sample preparation for pure liquid samples. What is a thin film cell? a thin film cell a thin film cell is a drop of pure liquid sample is a drop of."— Presentation transcript:

1 IR sample preparation for pure liquid samples

2 What is a thin film cell? a thin film cell a thin film cell is a drop of pure liquid sample is a drop of pure liquid sample sandwiched between salt (NaCl) discs sandwiched between salt (NaCl) discs

3 Thin film IR cells Salt (NaCl) discs are used Salt (NaCl) discs are used To hold the sample To hold the sample So the holder won’t absorb infrared light So the holder won’t absorb infrared light and only sample absorption is detected and only sample absorption is detected

4 Sample preparation so only dry (anhydrous) samples are used so only dry (anhydrous) samples are used because even traces of water etch the IR discs because even traces of water etch the IR discs affecting the path length of light affecting the path length of light and the optical quality of discs and the optical quality of discs

5 use clean gloves to work with salt discs put on an extra pair of gloves to protect cells from anything aqueous on your regular gloves

6 Preparing salt discs Slide off The top of the Desiccator Remove Salt discs

7 replace desiccator cover immediately remove discs from sleeves and rest on kim wipe

8 to clean discs add a few drops of chloroform to each disc rub gently to clean off all traces of sample …

9 adding sample add one or two drops of sample in the middle of the 1 st disc lower the 2 nd disc on top as shown to spread sample evenly

10 placing discs in cell holder use your finger to make a platform in the cell holder lower in the NaCl discs do not wedge them

11 gently place lid on top slide into position in light beam

12 close sample compartment remove gloves before using keyboard

13 to clean discs add a few drops of chloroform to each disc rub gently to clean off all traces of sample …

14 Keep discs dry replace in desiccator after cleaning …


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