Several challenges exist in implementing effective QA in nanotechnology:
1. Complexity of Nanomaterials: The unique properties and behaviors of nanomaterials make standardization difficult. 2. Lack of Universal Standards: While efforts are ongoing, universal standards for nanotechnology are still in development. 3. Measurement Limitations: Existing measurement techniques may not always be applicable or sufficient at the nanoscale. 4. Regulatory Hurdles: Different countries have different regulations, complicating international compliance. 5. Risk Management: Assessing long-term risks associated with nanomaterials remains a challenge.