The standard industrial, environmental, and toxicological reference list of 23 commonly monitored heavy metals features chemical elements possessing a relatively high density and specific gravity greater than 5.0. This comprehensive group includes iron, copper, zinc, nickel, chromium, tin, lead, gold, platinum, silver, palladium, cadmium, mercury, arsenic, antimony, bismuth, cobalt, manganese, vanadium, molybdenum, selenium, thallium, and beryllium. These substances are strictly regulated in manufacturing, water safety, and waste management due to potential toxicity.
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