流动注射在线离子交换预富集火焰原子吸收光谱法测定水样中微量锰

提出了以732强酸型阳离子树脂作填充材料,流动注射在线离子交换预富集火焰原子吸收光谱法测定水样中微量锰的分析方法。优化了各项化学条件和流路参数等,考察了共存离子的干扰。富集倍数可达24倍,分析速度为15～20样/h,检出限为2.0ng/mL,相对标准偏差为2.8%(n=15)。对雨水加标回收,回收率为97%～103%。     

超声波提取-火焰原子吸收光谱法连续测定土壤中有效铜铁锌锰

为提高测土配方施肥的测土效率,建立了超声波提取-火焰原子吸收光谱法连续测定土壤提取液中有效态铜、铁、锌、锰的快速检测方法.实验结果表明,该方法加标回收率为77.6%～95.5%,相对标准偏差(RSD)为2.2%～6.5%,测定结果与农业行业标准方法的测定结果无显著性差异.方法具有快速,准确,操作简单等特点,有较好的实用...     

钒酸钇晶体的价态分析

应用XRD分析,观察到在标准配比的条件下,酸碱度的变化引起粉末样品的X射线谱谱线加宽.用XPS证明钒酸钇晶体颜色加深以及晶体内部存在的包裹体与形成低价钒酸盐有关.通过拟合给出四价钒元素在整个钒元素中所占的比例为9.2;.     

苦玄参化学成分的研究——Ⅰ.苦玄参苷元Ⅰ的结构

从玄参科的苦玄参植物中分出一系列苦味苷的苷元.苦玄参苷元Ⅰ(1)是其主要成分.通过1及其衍生物的Uv,IR,¹HNMR,¹³CNMR及MS的谱学分析和若干化学反应确定1的结构为具有二氢呋喃酮边链的新型四环三萜.苦玄参苷经药理实验证明有抗癌活性.     

In2O3纳米微粒非线性光学特性

用Z扫描技术研究了In₂O₃纳米微粒有机溶胶和水溶胶的三阶非线性光学特性,发现表面修饰能明显提高In₂O₃纳米微粒的非线性响应.讨论了表面偶极效应对In₂O₃纳米微粒非线性的影响. 关键词：     

Optimizing Film Design and Application for the Recordable Compact Disk Developed by Two Cyanine Dye Samples

Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ａｃｙａｎｉｎｅｄｙｅｗａｓｓｔｕｄｉｅｄａｎｄｕｓｅｄａｓｌａｓｅｒｄｙｅａｎｄｐｈｏｔｏｓｅｎｓｉｔｉｚｅｒｌｏｎｇａｇｏ．Ｉｎｔｈｅｃｕｒｒｅｎｔｙｅａｒｓ,ｃｙａｎｉｎｅｄｙｅｐｒｅｐａｒａｔｉｏｎｓａｒｅｓｔｕｄｉｅｄｄｅｅｐｌｙａｎｄｗｉｄｅｌｙｕｓｅｄａｓｏｐｔｉｃａｌｓｔｏｒａｇｅｍｅｄｉａ［１］．Ｃｙａｎｉｎｅｄｙｅｈａｓａｇｏｏｄｓｏｌｕｂｉｌｉｔｙｉｎｓｏｍｅｏｒｇａｎｉｃｓｏｌｖｅｎｔｓ,ｔｈｅｒｅｆｏｒｅ,ｐｒｅｐａｒａｔｉｏｎｏｆｃｙａｎｉ…     

放射性束在固体物理和材料科学中的应用

回顾了放射性核素在固体物理和材料科学中的应用,并对高能放射性束流的应用前景作了展望．The application of radioactive isotopes to solid state physics and material science is reviewed and the perspectives with high energy radioactive ion beams are discussed.     

He-Ne激光照射对SP2/0骨髓瘤小鼠TNF及TNFR水平的影响

The emission cross section for the 2F5/2-2F7/2 transition of Yb3+ has been determined from absorption and emission measurements of some phosphate glasses at room temperature. The emission cross sections and fluorescence lifetime range from approximately 1.00 to 1.65 pm2, 0.3～2.0 ms, respectively. Systematic variations of the spectroscopic properties with glass composition can be used to tailor emission cross sections and fluorescence lifetimes.     

Comparison of Neural Networks and Theoretical Correction Models

In x-ray fluorescence spectrometry, matrix effects have to be corrected. The empiric equations, the theoretical coefficients and the fundamental parameters can be applied in the purpose. The classical matrix correction models include mainly Lachance-Trail,Rousseau, De Jongh, Claisse-Quentin, COLA algorithms,etc. The good results can be obtained by using a number of standards or the theoretical Alpha coefficients if the range of component concentrations in samples is not very wide. When unknown samples with a wide range of concentrations are predicted, a recalculation process of the theoretical Alpha coefficients has to be made. In addition, a spline function may be chosen to split wide range in several segments.     

Fraction of Aqueous Aluminum in Natural Waters by 8-Hydroxyquinoline Fluorimetry-Ion Exchange Method

Aluminum is one of the most abundant elements in the earth crust. Elevated aluminum concentrations in natural waters associated with acidic deposition are toxic to plants and aquatic organisms.