How does iron particle size affect the removal of the dyes? In addition to the synthesized nanoparticles, you will have access to several different bulk iron particle samples (with diameters of 1 mm, 0.15 mm, 0.069 mm, and < 0.088 mm). When running the reaction between iron particles and the dye solution, weigh 0.25 g of iron powder you are using and add to the dye solution. Note which size of particles you are using. Also instead of taking absorption measurements every 30 seconds, take them every minute for a total of 10 minutes