2014-2018年四川省广汉市农用地土壤中铬、铅、镉含量监测结果分析

Analysis of Monitoring Results on the Content of Chromium,Lead and Cadmium in Agricultural Soil of Guanghan City in Sichuan Province From 2014 to 2018

目的通过监测广汉市农用地土壤中铬、铅、镉含量情况,提供保护和改善土壤环境依据。方法 2014-2018年对广汉市5个乡镇20个村的100份农用地土壤中铬、铅、镉分别按照《土壤中铬的测定火焰原子吸收分光光度法》(HJ 491-2009)和《土壤质量铅、镉的测定石墨炉原子吸收分光光度法》(GB/T 17141)进行监测,依据《土壤环境质量农用地土壤污染风险管控标准(试行)》(GB 15618-2018)分析评价农用地土壤存在风险。结果广汉市农用地土壤中铬检测结果范围23.7~115.1 mg/kg,铅检测结果范围11.9~73.1 mg/kg,镉检测结果范围0.12~1.10 mg/kg,100份农用地土壤铬、铅检测结果均低于农用地土壤风险筛选值;41%的土壤样品镉检测结果高于农用地土壤风险筛选值,低于风险管制值。结论广汉市农用地土壤中铬、铅污染风险低,镉污染高于农用地土壤风险筛选值,存在风险,职能部门应高度重视并加强土壤中镉污染监测,开展土壤污染综合防治。

Objective To investigate the content of chromium,lead and cadmium in agricultural soil of Guanghan City,so as to provide scientific references for protecting and improving soil environment.Methods According to the Soil quality-determination of total chromium-flame atomic absorption spectrometry(HJ 491-2009)and the Soil quality-determination of lead and cadmiumgraphite furnace atomic absorption spectrometry(GB/T17141),100 samples of farmland soil collected from 20 administrative villages in five townships were tested in 2014-2018.The soil contamination risk of agricultural land were evaluated based on the criteria of Soil environmental quality-Risk control standard for soil contamination of agricultural land(trial implementation)(GB15618-2018).Results The content of chromium in farmland soil was 23.7-115.1 mg/kg,the content of lead was 11.9-73.1 mg/kg,and the content of cadmium was 0.12-1.10 mg/kg in Guanghan.Results of the content of chromium and lead in100 samples of farmland soils were lower than risk screening values.Results of the content cadmium in 41 of soil samples were higher than risk screening values,but were lower than risk intervention values.Conclusion The risk of chromium and lead in soil contamination of agricultural land is low in Guanghan.The content of cadmium is higher than soil risk screening values,and there are potential risks for cadmium pollution.Functional departments should attach great importance to the monitoring of cadmium contamination in soil and carry out comprehensive prevention and control of soil contamination.