闽北部分乡镇农田土壤铅镉含量调查与分析

The survey and analysis of lead and cadmium content in farm land soil of some towns in Minbei area

目的了解闽北部分乡镇农田土壤中重金属铅、镉污染状况,为治理环境污染提供科学依据。方法结合省下达的农村环境土壤监测任务,分别对邵武、建阳两个县级市所管辖的20个乡镇的农田土壤进行采样、检测和评价。每个乡镇采集土壤4份,共采集80份,用石墨炉原子吸收光谱法测定铅、镉含量。结果这2个县级市的乡镇农田土壤pH处于弱酸性至中性,铅含量在11 mg/kg^121 mg/kg之间,有30个自然村的土壤铅含量达到自然背景水平。镉含量在0.027 mg/kg^1.12 mg/kg之间,有13个自然村土壤镉含量超过0.30 mg/kg。结论土壤中重金属铅含量远远低于国家环境土壤质量二级标准;镉污染较为严重,应引起有关部门重视,加强环境保护治理工作。

Objective To learn the pollution of heavy metal lead and cadmium in the country and town of Minbei, providing scientific proof for environment pollution treatment. Methods Integrating with the tasks of soil supervising in country side from province authority, farmland soil samples from 20 towns and countries governed by Shaowu and Jianyang were collected for ex- amination and evaluation. The lead and cadmium content were determined in 80 soil samples, four from each town, by graphite furnace atomic absorption spectrometry. Results The pH values in soil of the two towns is from slightly acidic to neutral. The content of lead is between 11 mg/kg ~ 121 mg/kg. Soil in 30 villages is at the nature background level. The content of cadmium is between O. 027 mg/kg - 1.12 mg/kg with soil in 13 villages beyond O. 30 mg/kg. Conclusion The heavy metal lead content in soil is less than the second - rank standard of national soil quality; while the pollution of cadmium is comparatively serous. This situation should attract attention of relevant departments to strengthen the treatment and protection of environment.