Multiple reflection ATR is ideal for detecting miniscule levels of components in solutions. If one component is volatile, trace analysis can be simplified by allowing the volatile liquids to evaporate. A multiple reflection ATR with a small sampling area is advantageous in cases where limited sample is available, as it allows additional concentration of the residue.

This note explores the use of a multiple reflection diamond ATR accessory to detect and identify the minor chemical variability between different types of nail polish remover.

Experimental

Figure 1: ConcentratIR2™ Multiple Reflection ATR.

Harrick Diamond ConcentratIR2™ (see Figure 1), which supplies seven reflections from the sample, was installed and aligned in a commercial FTIR spectrometer. Spectra were collected at 4 cm^-1 resolution and signal averaged over 64 scans. Three nail polish removers — the original, nourishing, and strengthening formulations from the same brand — were analyzed. A single drop of each type was placed on the diamond ATR crystal. Infrared spectra were collected over a range of 4000 cm^-1 to 650 cm^-1 periodically until the solvent, acetone, had fully evaporated.