方　法随机选择在当地居住３０年以上的人群为调查对象。污染区人数为２４７名（男１２０人、女１２７人，平均年龄５１２４岁），对照区人数为２５３名（男１２４人、女１２９人，平均年龄５２００岁）。样品采集为即时尿，并调节尿ｐＨ值２左右（测尿镉用）和ｐＨ值７左 Methods randomly selected people living in the area for more than 30 years as the survey subjects. The number of contaminated areas was 247 (including 120 males and 127 females, with an average age of 51.24 years). There were 253 males (124 males and 129 females, mean age 5200 years) in the control area. Sample collection for immediate urine, and adjust the urine pH value of about 2 (urine test) and pH 7 left