成都市新都区大米及土壤中镉污染调查

Cadmium Pollution in Soil and Rice in Xindu District of Chengdu

目的了解成都市新都区自产大米及土壤中镉污染水平,并研究2者之间的关联性。方法采集该区13个乡镇,每个乡镇分东西南北中采集5份农户自产大米及出产大米的土壤,共计65份大米样品、65份土壤样品,进行检测。同时采集不同于成都平原地貌和水系的陕西汉中市汉台区武乡镇15份自产大米及出产大米的土壤15份作为对照组样品,进行检测。对大米中镉含量及土壤中镉含量的相关性进行研究。结果新都区自产大米中镉检测平均值0.28 mg/kg,合格率24.6%,属于重度污染水平;土壤中镉检测平均值0.33 mg/kg,属于轻度污染水平。对照组大米中镉检测平均值0.09 mg/kg,合格率100%,属轻度污染水平;土壤中镉检测平均值<0.05 mg/kg,合格率100%,属正常背景水平。结论新都区土壤中镉含量较高,由于水稻根系的富集作用,导致大米中镉污染水平较高。新都区大米中镉含量与土壤中镉含量存在正相关性。

Objective To detect the Cd content in rice and soil in Xindu district, Chengdu, and to explore the re-lationship between Cd contents in rice and soil. Methods A total of 65 rice samples and 65 soil samples from 13 towns of 5 directions in Xindu were collected, taking 15 rice samples and 15 soil samples from Wuxiang Hantai, Shaanxi province as comparison. Results The average content of Cd in rice from xindu district was 0. 28 mg/kg with a qualified rate of 24.6%, belonged to heavy pollution; the average value of Cd in soil was 0. 33 mg/kg, belonged to light pollution. In comparison groups, the average value of Cd in rice was 0. 09 mg/kg, with a qualified rate of 100%, belonged to light pollution; the average value of Cd in soil was less than 0. 05 mg/kg, with a pass rate of 100%, belonged to the normal level. Conclusion Due to the enrichment of the rice roots, the Cd pollution level in rice is rising.