1)  lead
铅元素
1.
By analyzing the content of nitrogen, sulfur and lead in leaves of plants in every function district of Nanjing city, the index of air environment pollution of plants was studied, and the relationship between seasonal changes of the content of nitrogen, sulfur and lead in leaves of plants and air environment pollution of the city was discussed.
通过对南京市区的各功能区植物叶片中的氮、硫、铅元素含量的分析,研究了植物大气环境污染指数,探讨了植物叶片的氮、硫、铅元素含量的季节变化,以及与城市大气环境污染之间的关系。
2)  monitoring of lead
铅元素监测
3)  lead-free component
无铅元器件
补充资料:铅-铅测年
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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。

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