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铅是环境污染物中毒性很大的一种重金属,在自然界中分布广,工业用途多。随着工业污染,食物、土壤和饮水中均可含有微量铅,汽车尾气中的铅又可污染大气,这些构成了人类生活中铅进入人体的主要来源。生活中有危害作用的铅的来源有:(1)学习、生活用品中的含铅油漆和颜料如住房、玩具、学习用品和家具中的含铅油漆,食物容器中所含的铅等。学习用品中以课桌油漆层、教科书封面及彩页、深色铅笔漆层的可溶性铅含量最高。由于幼儿常有吸吮手指和啃咬玩具的习惯,在胃液中,玩具和学
Lead is a heavy metal toxic to environmental pollutants, widely distributed in nature and used in many industrial applications. With industrial pollution, trace amounts of lead can be contained in food, soil and drinking water, and lead in automobile exhaust can pollute the atmosphere, which constitutes the major source of lead into the human body in human life. Sources of harmful lead in life include: (1) Leaded paint and pigments in learning and household products such as lead paint in housing, toys, school supplies and furniture, and lead in food containers. School supplies to the desk paint, textbook cover and color pages, dark lead pencil paint the highest content of soluble lead. As children often suck finger and bite the habit of toys in the stomach, toys and learning