In the case of liquid samples, or samples comprised of fine powder, the sample surface must be covered in order to prevent solvent evaporation or scattering of fine particles. Two types of sunscreen lotion were measured by mounting a liquid sample holder to a benchtop X-ray diffractometer.
Measurements and Results
Fig. 1 shows a photo of the liquid sample holder filled with sunscreen lotion.
Fig. 2 shows qualitative analysis results for two types of sunscreen. The main component of both lotions is zinc oxide, but it is evident that the sunscreen lotion from Company A (PA+++) contains talc, and the sunscreen lotion from Company B (PA++++) contains titanium oxide.