摘要
采用微波消解—原子荧光法测定表层土壤、底泥和一年生草本植物(分根,茎,叶)中的铅、汞总量。NH4OAc(0.5mol/L)+HOAc(0.5mol/L)+Na2EDTA(0.02mol/L)一次提取后用原子荧光法测定土壤、底泥中铅、汞的生物有效态(可被生物吸收的组分)含量。铅、汞生物有效态含量分别低于其总量的10%、5%,少数底泥中铅含量稍高(最高16.79%)。比较铅、汞生物有效态含量及总量与地表植物中铅、汞总量的相关性,结果表明地表草本植物对铅、汞的吸收积累与土壤中的有效态部分比总量有更明显的相关性。因此,用土壤有效含量评价土壤中重金属的生态风险更贴近实际。
The total concentrations of lead and mercury were determined in the soils,sediments and one-year-herbs(root,stem and leaf)in Shenyang by the microwave digestion-atomic fluorescence spectrometry.In the meantime,the bio-available concentrations(the part that is available to biology) of lead and mercury were extracted by one-step extraction method using the extraction liquid composed of NH4OAc(0.5mol/L),HOAc(0.5mol/L) and Na2EDTA(0.02mol/L).Also,the bio-available concentrations were determined by atomic fluorescence spectrometry.The results showed that the bioavailable concentrations of lead in soil were lower than 10% of the total concentration,while for mercury was lower than 5% and the bioavailable concentrations of lead in a small amount of sediments were somewhat higher(maximum 16.79%).By the comparison of the relations of bioavialable and total concentrations of lead and mercury in soil with the total concentrations of lead and mercury in plants,it could be concluded that the absorption and accumulation of lead and mercury of herbs were more obviously related with the bioavailable concentration in soil than the total concentration.Therefore,the evaluation of the ecological risk of heavy metals in soil with the bioavailable concentration was more close to the fact.
出处
《城市环境与城市生态》
CAS
CSCD
2007年第4期1-3,共3页
Urban Environment & Urban Ecology
基金
国家重点基础研究发展计划(973计划)资助项目(2004CB418504)
