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铅是古老的金属,人类生产使用铅已有几千年历史至今铅仍有广泛用途。工业上使用铅,煤燃烧及含铅汽油的废气等,成为铅污染环境的主要来源,在重金属的全球性污染中,铅名列第一。铅及其化合物对人和生物均有毒害。近年来毒理学研究证明铅干扰血红素合成:使神经行为和周围神经生理发生变化;对染色体,精子生成,胚胎发育也有影响。铅中毒是常见职业病,治疗铅中毒均采用EDTA二钠钙,该药效果虽佳,但有时有副作用,如肾脏损害及导致体内必需微量元素流失。特别是在连续接触铅的情况下,长期使用此络合剂对健康不利。国外用动物实验证明低酯果胶(即“低甲氧果
Lead is an ancient metal, and lead has been used for many thousands of years in human production. Industrial use of lead, coal combustion and leaded gasoline emissions, etc., become the main source of lead pollution of the environment, in the global heavy metal pollution, lead ranked first. Lead and its compounds are toxic to humans and living things. In recent years, toxicological studies have shown that lead interference with heme synthesis: changes in neurological behavior and peripheral neurophysiology; on chromosomes, sperm production, embryonic development also have an impact. Lead poisoning is a common occupational disease, the treatment of lead poisoning are used disodium EDTA, although the drug effect is good, but sometimes side effects, such as kidney damage and lead to the loss of essential trace elements in the body. In the case of continuous exposure to lead, long-term use of this complexing agent is detrimental to health. Foreign animal experiments show that low-ester pectin (ie "low-methoxy-fruit