土壤基质中不同目标浓度重金属标准样品的研制

Development of Reference Materials for Heavy Metals in Soil Matrix

介绍了一种土壤重金属标准样品的研制过程。土壤样品经匀浆、干燥、研磨、混匀分瓶包装后,用X射线荧光光谱法对土壤标准样品进行了均匀性、稳定性检验,并采用ICP-OES、ICP-MS和XRF对制备的标准样品进行了定值。试验结果表明:土壤标准样品均匀性良好,各元素和氧化物的瓶间均匀性不确定度u_(bb)范围为0.02 mg/kg~0.043%;在常温避光保存条件下,该土壤标准样品在为期12个月的稳定性检验过程中无不稳定变化趋势;再处理过程对土壤的性质几乎没有影响。该方法是一种简单、有效的制备目标浓度、特定污染因子土壤重金属标准样品的方法。

The preparation method for developing candidate reference materials of heavy metals in soils matrix have been developed.The samples were prepared by mixing,drying,grounding and packing,followed by homogeneity testing,stability testing and the value of the reference material was determined by ICP-OES,ICP-MS and XRF.The soil reference material exhibited good homogeneity and stability.Additionally,the uncertainty of the uniformity between bottles(u_(bb))was 0.02 mg/kg~0.043%,and the sample exhibited good uniformity.The reference material was stored at room temperature,and its stability was determined for 12 months,the results indicated good stability.The reprocessing process has almost no effect on the properties of the soil reference materials.That is a good foundation for the development reference materials of heavy metals in soil matrix.