劣质玩具和文具中含有过量的苯、铅、镉等化学成分或重金属,其中对儿童危害最大的是重金属元素铅,铅超标达到一定的浓度可以影响儿童神经、造血、免疫、记忆、智力发育等功能,有的甚至可以出现烦躁易怒等症状。铅中毒最早出现的症状多为食欲减退、恶心、呕吐、腹泻、消化 Low-quality toys and stationery contain excessive amounts of benzene, lead, cadmium and other chemical components or heavy metals, of which the most harmful to children is heavy metals lead, lead exceeded a certain concentration can affect children’s nervous, hematopoietic, immune, memory, intellectual development Function, and some even irritable irritability and other symptoms. The earliest symptoms of lead poisoning are mostly loss of appetite, nausea, vomiting, diarrhea, digestion