Total Reflection X-ray Fluorescence spectrometry determination of titanium dioxide released from UV-protective textiles during wash.

The aim of this study is to determine the release of TiO from six sport garments into the wash water after 1, 2 and 10 washes. For such, Total Reflection X-ray Fluorescence (TXRF) spectrometry was employed for the study of the wash water and Scanning Electron Microscopy - Energy Dispersive Spectrometry (SEM-EDS) was used for the analysis of the textiles. Results showed that the six sport garments released between 0.106 mg/L and 0.352 mg/L after the first two washes and between 0.028 mg/L and 0.337 mg/L of Ti after ten washes. The values found for the Ti amount released in wash water, and consequently into the environment, is much less than other common sources. These results showed the potential of TXRF spectrometry in quantifying Ti in wash water, which is a hard task even for well-established methods. SEM images show that all six samples were weft knitted fabrics, with yarns of approximately 250 μm of width and fibers' width between 9 and 13 μm.