在WGD-8A光栅光谱仪上实现变温荧光特性测量

介绍了一种在普通光栅光谱仪上实现材料荧光 温度特性测量的低成本方法,并给出了系统的详尽配置和运用该系统对部分材料荧光温度特性测量的结果.     

矩形样品池对激光粒度测量的影响及其修正

激光测粒仪中的矩形样品池的透明壁会对颗粒的散射光产生折射效应 ,该折射效应将影响光电探测器接收到的散射光的散射角和颗粒的视在位置。分别对样品池前置、后置及动态光散射三种情况下进行了分析 ,给出了校正公式。     

离子色谱法测定环境空气样品中的氟化物

采用离子色谱法测定环境空气样品中的氟化物,具有操作简单,灵敏度高,准确度高、重现性好等优点。氟化物的测定线性范围为0.004-1000mg/L,方法的检出线为0.004mg/L,相对标准偏差小于等于3.1%,加标回收率在96%-105%范围内。测定环境空气样品中的氟化物,获得了满意的结果。     

Geochemical characteristics of seamount ferromanganese nodules from mid-Pacific Ocean

Nine seamount ferromanganese nodules from six seamounts in the mid-Paciflc Ocean have been sampled,the obtained sixteen sub-samples were used to analyze their main elements, trace elements and rare earth elements by the chemical method and ICP-MS, platinum group elements have also been analyzed for some subsamples, using the methods of Te co-precipitation pre-concentration and isotope dilution. All subsamples have been analyzed by X-ray diffraction for their mineral composition. It is shown from the analysis results that the mineral composition, chemical characteristics and the occurrence of main components of seamount nodules from mid-Pacific Ocean are similar to those of hydrogenous cobalt-rich crust on seamounts, which indicates that seamount nodules were hydrogenous. Compared with the ferromanganese nodules occurring on the surface of deep-sea sediments, seamount nodules have higher Fe and Co but lower Cu and Ni, so the seamount nodules from mid-Pacific Ocean might be formed on the surface of sediments on seamounts in weak acidic but strong oxidation environment. Because of their similar occurring depth and redox conditions, seamount nodules are very similar to cobait-rich crust in their chemical composition, minerals and occurrence of main compositions. However, having been found on the sediment-seawater interface, seamount nodules experienced the influence of early-diagenesis of sediments, so the typical seamount crust has some characteristics of transition to ferromanganese nodules.     

燃烧热测定实验中样品池的改进

对易挥发性液体样品燃烧热测定实验过程中所用样品池进行了改进．     

La2—xSrxCuO4—δ多晶样品的差分比热

系统地研究了La_(2-x)Sr_xCuO_(4-δ)多晶样品的差分比热.La_(2-x)Sr_xCuO_(4-δ)超导转变的比热跳跃△C 和超导转变温度 T_c 随 Sr 含量而有规律地变化.在 x=0.15处,△C/T_c 和Sommerfeld 常数△γ=C_(es)/T-C_(en)/T 均为极大值,当 Sr 含量偏离 X=0.15时,比热反常峰变圆滑,峰值和 Sommerfeld 常数 △γ 减小,T_c 降低.约化比热反常△C/△γ(0)T_c 随样品烧结条件改变出现不同的变化趋势.上述现象表示,最均匀的超导电性只出现在 Sr 含量x=0.15附近很窄的范围内.     

在线流动注射液-液萃取非水介质汞还原原子荧光光谱法的研究及应用

提出了一种流动注射在线液－液萃取有机相汞还原原子荧光光谱法测定汞的新方法。该法以KI＋HNO3＋（NH2）2CS／TBP为萃取体系，将汞萃取到有机相中，汞还原反应是在金属络合萃取液与含NaBH4的N，N－二甲基甲酰铵（DMF）溶液和冰乙酸中发生。应用流动注射技术实现了液－液萃取非水介质汞还原反应原子荧光测定的在线分析。研究了反应的最佳条件和流动注射流路及运行程序。该法提高了测定灵敏度并消除了干扰。用于地质样品中汞的测定得到好的准确度和精密度。     

《纺织品介电常数测定》实验中样品的选择

“纺织品介电常数测定”实验中样品的选择对保证实验的顺利进行十分重要。对多种样品在多种条件下进行测试。并对实验结果进行了分析。