Objective Based on the field sampling campaigns by NIST and ASU personnel, two hypotheses have been suggested to help explain the significant (and unexpected) concentration of ionic Ti in different aqueous samples. 1. Nano-Ti from personal care products (sunscreen, make-up, lotions, etc.) is dissolving in the presence of biological molecules, high chloride and/or oxidizing/reducing environments. Such environments are present in the human gut as well as swimming pools, drinking and wastewater treatment facilities and the natural environment. 2. Bodily fluids (namely urine) contain significant concentrations of ionic Ti, which is released into swimming pools during bathing.. In order to test these hypotheses, a series of specific research activities will be conducted. These tasks include: 1. Validate analysis protocols to both differentiate and quantitate ionic Ti from nano-Ti in aqueous solutions; 2. Evaluate the dissolution potential of nano-TiO2 in the presence of simulated bodily fluids and several common pool disinfectants; 3. Evaluate Ti content in urine for a pilot epidemiology study with a small cohort of students exposed to products either with or without nano-TiO2.
|Effective start/end date||9/1/13 → 4/30/14|
- DOC: National Institute of Standards and Technology (NIST): $15,000.00