1)  leaden,plumbean,plumbous
铅的
2)  determination of lead
铅的测定
1.
On the basis of referring the State Standard for determination of lead in crude lead,an improved method for determination of lead was reported in this paper.
本文在参照粗铅中铅的测定标准分析方法的基础上,对铅的测定方法进行了改进。
3)  lead amount
铅的含量
1.
Preserved eggs with lead amount above national standard as long-term diet will do great harm to peopl.
分析结果表明,在该农贸市场销售的松花蛋中,重金属铅的含量普遍高于国家标准。
4)  Lead determination
铅的测定
5)  lead source
铅的来源
1.
Lead isotopic composition and lead source of the Mengentaolegai Ag Pb Zn In deposit in Inner Mongolia;
内蒙古孟恩陶勒盖银铅锌铟矿床的铅同位素组成及矿石铅的来源探讨
6)  detennination of lead
铅的分析
参考词条
补充资料:铅-铅测年
分子式:
CAS号:

性质:238U和235U两个母体铀同位素的特性实质相同,所产生的放射性成因206,207Pb的方程可合并为(207Pb/206Pb)=[(235U/238U)](t-1)。235U/238U现在的比值是1/137.8,利用非放射性成因‘稳定’204Pb作为参考同位素,作(207Pb/204Pb)与(206Pb/204Pb)的Pb-Pb等时线,应用方程计算年龄,式中(207Pb/204Pb)和(206Pb/204Pb)0是初始比值。

说明:补充资料仅用于学习参考,请勿用于其它任何用途。