The Environmental Reference Materials (ERMs) are primarily used in quality assurance and quality control in the process of environmental monitoring and analysis, and it can also be used in analytical instrument correction, analytical method contrast and analytical technology arbitration. This ERM was prepared in super-clean lab with high pure reagents and sub-packed in 20ml ampoules. No significant differences in concentration among sub-samples were found. The certified value and uncertainty were based on the analytical results of eight labs by AAS method. This ERM should be stored at a dark and cool place. When you use this ERM, please carefully break open the ampoule at the neck and pipette 10 ml from the ampoule into 250 ml volumetric flask and bring to volume by 1% HNO3 solution. The concentration of the diluted solution is as following：
铅 Pb 0270109
成 分 标准值(mg/L) 不确定度(mg/L) Component Certified value Uncertainty
Pb 1.20 0.07
有效期到 2005 年 12 月 The expiration date is up to Dec.2005.
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