The phrase "concentrated amounts" means a large or significant quantity of something that is gathered or focused in a particular area or situation. Full definition
Although the exact chemical composition depends on the type of coal burned, all coal ash contains concentrated amounts of toxic elements, including arsenic, lead, and mercury. (ucsusa.org)
Some products offered as treats contain high levels of fat and starch, components your bunny's digestive tract can't handle in concentrated amounts. (smallanimalchanel.com)
What makes it so special is that just a small amount is loaded with concentrated amounts of vitamins, minerals, and proteins. (cancertutor.com)