Urea is an emerging contaminant ... ICIQ in Tarragona have developed a simple technique to produce microscopic crystals that activate in the presence of light, releasing silver ions with ...

Doing so pushed the urea, oxygen from the surrounding air, and hydrogen in the water to form solid percarbamide crystals. The crystals were then filtered from the water, ready for use as a fertilizer.

With most diesel trucks, limp means undriveable. The crystalized urea forms a white, odorless crystal or clump of crystal ...