三相萃取分离法测定铅丹中痕量杂质元素

研究了三相萃取分离法测定铅丹（四氧化三铅）中Fe、Cu、Ni、Co、Mn、Zn、Cd等痕量杂质元素的分析方法，考察了Pb基体对待测元素的干扰情况。方法检出限0．06－0．6μg/g，加标回收率均＞87％，标准回收变动系数＜10％。     

Preparation and characterization of glassy and superconducting (Bi,Pb, Sb)-Sr-Ca-Cu-O systems

Superconducting compounds with nominal compositions Bi_1.7Pb_0.3Sr_1.6Ca₂ Cu_3.4O _x and Bi_1.9Sb_0.1Sr₂Ca₂Cu₃O _y have been synthesized by ceramic and glass routes and characterized by X-ray diffraction, electrical resistivity and dielectric constant measurements. The zero-electrical resistance temperatures are about 70K. The dielectric constant of the glasses at room temperature is around 30.     

PINT铁电晶体的助熔剂法制备工艺与介电性能

用助熔剂法制备了准同型相界附近的弛豫铁电体基钛铌铟酸铅（Pb（In1／2Nb12）0.63Ti0.37O3，简称PINT）铁电单晶体，研究了四氧化三铅（Pb3O4）与二氟化铅（PbF2）助熔剂对钙钛矿结构相稳定性的不同作用。用四氧化三铅（Pb3O4）和三氧化二硼（B2O3）作为助熔剂获得尺寸达5mm的纯钙钛矿相结构PINT单晶体，利用显微分析方法、X射线衍射技术研究了单晶体的微观形貌和相结构，测量了〈100〉取向单晶体样品的介电温度谱。     

《饲料级磷酸氢钙》标准中铅含量的测定方法--双硫腙分光光度法的研究

分析 HG 2 6 36 2 0 0 0《饲料级磷酸氢钙》行业标准中铅含量测定方法中存在的问题 ,通过试验提出了测定方法的改进意见。     

The surface morphologies of (Pb, Sr) TiO3 thin film fabricated on Si-buffered Pt/Ti/SiO2/Si substrate

(Pb, Sr)TiO3 (PST) thin film are fabricated by RF magnetron sputtering on Si-buffered Pt/Ti/SiO2/Si substrates with different buffer layer deposition time. Surface morphologies of the buffer layer indicate an improving surface roughness and larger grains with the prolongation of sputtering time. Deposition of PST thin films shows excellent surface fluctuation filling ability to improve the surface roughness of substrates. PST surface morphologies exhibit apparently different grain forms according to the preparation time durance of buffer layer.     

巯基花生壳对Cu~(2+)、Pb~(2+)吸附效率的测定

以花生壳为原料,用硫代乙醇酸和乙酸酐改性花生壳做固体吸附剂,并探讨了改性前后的花生壳在不同吸附条件下,定量吸附水样中的Cu(Ⅱ),Pb(Ⅱ)的能力,采用原子吸收光度法分别测定其含量的方法。实验得出,对于50mL 5.001μg/mL Cu(Ⅱ)溶液,1.5g巯基花生壳在常温下做2.5h静态吸附的吸附效率最好,可达到92.82%。而对于50ml 43.35μg/mL溶液,2g未改性花生壳(常温)和1g未改性花生壳(加热至40℃)做2.5h静态吸附时吸附效率最好,其吸附效率可以分别达到91.43%和91.26%。     

历史时期泥炭吸附重金属铅的国外研究进展

重金属铅(Pb)的污染在现今工业时代日益严重。研究历史时期的Pb污染,对于了解Pb的现代过程具有重要意义。泥炭沼泽是记录地质历史时期Pb沉降的良好载体,尤其是贫营养泥炭沼泽,其中Pb的移动很弱,它记录的大气Pb沉降的指示作用更为准确。富营养泥炭在水-沉积物相互作用对Pb的影响较小的情况下,也可以有效地指示Pb的含量变化。通过贫营养泥炭记录的大气Pb沉降揭示欧洲Pb污染,已经有5000余年的历史。罗马时代、近代出现的Pb污染峰值,分别与罗马时期大规模采矿、近代燃烧含Pb汽油密切相关。未来有关Pb污染史的研究趋势将向定量化的方向发展,并采用实验模拟、数理统计分析等方法,从宏观和微观等多角度进行历史时期Pb污染的研究。     

高铋粗铅电解精炼生产控制条件浅析及实践

分析了铋在粗铅电解精炼中的行为,介绍了高铋粗铅电解精炼中存在的问题,通过采取合理搭配粗铅、控制电流密度及电解液成分、阳极泥洗水铅铋置换等有效措施,确保了铅电解生产平稳运行,析出铅合格。     

应用~(210)Pb的南海黑角珊瑚定年

通过高分辨低本底的α能谱检测技术对采自南海西沙群岛(JYI-1、JYI-2)和鹿回头半岛(LHT)三株黑角珊瑚骨骼中的210Pb进行了测定,利用过剩210Pb比活度在珊瑚横截面的径向分布规律,对黑角珊瑚进行年代学研究。结果表明,210Pb在珊瑚骨骼中的比活度随径向呈指数衰减,各样品中210 Pb的比活度范围分别为10.28~73.41mBq/g(JYI-1),1.50~4.72mBq/g(JYI-2)和5.35~12.67mBq/g(LHT)。这些黑角珊瑚物种都表现出了生长缓慢、生长周期长的特性。它们持续生长了约185~267a,年生长率介于17.8~26.5μm/a。而且,年生长率在不同种属、不同区域的样品间有明显区别,生长速率的顺序为:西沙(JYI-2)西沙(JYI-1)鹿回头(LHT)。放射性核素210Pb对南海黑角珊瑚定年结果与生长环计数的定年结果基本一致。这种黑角珊瑚定年方法可以为其在百年尺度上研究气候环境的演变和重建提供基础数据。     

Comparative analysis on homogeneity of Pb and Cd in epoxy molding compounds

Reference materials for quantitative determination of regulated heavy metals, such as Pb and Cd in electronic components, were designed and investigated in terms of stability and homogeneity. Reference materials with two concentration levels of heavy metals were prepared by spiking Pb and Cd compounds to epoxy molding compounds made by mixing silica powders and epoxy resin. The concentration changes of the reference materials during stability test for 1 a were not observed. In the homogeneity assessment, the as-prepared reference materials were studied by using three different analytical tools, inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray fluoroescence spectrometry (XRF) and laser ablation ICP mass. The results show different homogeneities by the characteristics of analytical tools and the materials.