摘要
土壤中重金属的化学形态更能表明其迁移性和生物毒性。传统的重金属化学形态检测方法BCR法由于其提取时间长,影响检测效率。采用涡旋提取对传统BCR法进行方法优化,对土壤中Cu、Zn、Pb、Cd、Ni、Cr等6种重金属元素化学形态进行测定,通过考察涡旋转速、涡旋时间以及涡旋提取的方法精密度与准确度。结果表明,当涡旋转速为2 500 r/min、酸可交换态涡旋10 min、可还原态涡旋10 min、可氧化态涡旋5 min时,涡旋提取效果良好。采用土壤标准物质对方法的适用性进行了验证,6种元素的检出限在0.4~32μg/kg,测定值均在标准值范围内,相对标准偏差在0.30%~5.5%。涡旋提取-改进BCR法分析速度快、灵敏度高,能满足同时测定土壤中多种金属元素化学形态的检测要求。
The chemical speciation of heavy metals in soil can better indicate their mobility and biological toxicity.The traditional method of chemical speciation of heavy metals(BCR method)is affected by its long extraction time.In this study,the traditional BCR method was optimized by vortex extraction.The chemical speciation of Cu,Zn,Pb,Cd,Ni and Cr in soil were tested.Rotationl speed and extraction time of vortex extraction,precision and accuracy were also investigated.The results indicated that the vortex extraction effect was good when the vortex rotation was 2500 r/min,the vortex extraction time of acid exchangeable form was 10 minutes,the vortex extraction time of reducible form was 10 minutes,and the vortex extraction time of oxidizable form was 5 minutes.The applicability of the method was verified by using soil reference materials.The detection limit of six elements was 0.4-32μg/kg,and the measured values were within the range of standard values.Besides,the relative standard deviation was 0.30%-5.5%.The utilization of vortex extraction-modified BCR procedure had fast analysis speed and high sensitivity,which can meet the detection requirements for simultaneous determination of chemical speciation of various metal elements in soil.
作者
杨华
王艳丽
李利荣
YANG Hua;WANG Yanli;LI Lirong(Tianjin Ecological Environment Monitoring Center,Tianjin 300191,China)
出处
《中国无机分析化学》
CAS
北大核心
2023年第6期598-603,共6页
Chinese Journal of Inorganic Analytical Chemistry
基金
国家环境保护标准资助项目(2018-4)。
关键词
涡旋提取
土壤
化学形态
重金属
方法优化
vortex extraction
soil
chemical speciation
heavy metals
optimization
