A heavy metal, broadly speaking, is any relatively dense metal。 More specific definitions have been proposed (sometimes including metalloids such as arsenic and antimony), but no definition has obtained widespread acceptance。 Because of their heaviness and many specialised properties, heavy metals are useful in nearly all aspects of modern economic activity。 But some of them are very toxic。 Heavy metals cannot be biodegraded, instead it bioaccumulates in the environment or human bodies through the food chain。 The accumulation in human bodies may pose potential hazard of chronic toxicity。
GB 28480 Limit of Harmful Substances in Coatings for Toys
Other regulations, directives or standards
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