镉是毒性很强的重金属。近年,以镉化物做原料及催化剂的工厂日益增多。镉离子通过水—土壤—农作物进入食物链。人体内的镉,大部分来源于粮食和蔬菜。为了搞清污染情况,1983—84年,对西安地区土壤、小麦、玉米和蔬菜的含镉量作了分析,并以小麦为主进行了大田与盆栽试验。样品采集与分折 1.选代表性样点40个,并将以南郊非污灌区和东、西、北郊污灌区土壤样品进行盆栽试 Cadmium is a highly toxic heavy metal. In recent years, factories that make raw materials and catalysts with cadmium compounds have been increasing. Cadmium ions enter the food chain through water-soil-crops. The body of cadmium, most of it comes from food and vegetables. In order to clarify the pollution situation, the cadmium content of soils, wheat, maize and vegetables in Xi’an area was analyzed in 1983-84, and field experiments with pots were conducted mainly with wheat. Sample Collection and Analysis 1. 40 representative samples were selected and soil samples from non-sewage irrigation areas in the southern suburbs and sewage irrigation areas in the eastern, western and northern suburbs were potted