微波消解凯氏定氮法快速测定酱油中全氮

研究了凯氏定氮法测定酱油中全氮时样品的微波消解方法，进行了微波消解条件的选择及消解结果精密度试验，并与国家标准方法对比，验证了方法的准确度。试验结果表明，消解完全仪需20min，相对标准偏差均小于2%（n=7），回收率范围为96%～103%，经t检验，微波溶样法与国家标准凯氏定氮法的测定结果无显著性差异。     

三波长-分光光度法测定黑沙蒿中的总黄酮

以野樱素为对照品、 AlCl3作显色剂,建立了三波长-分光光度法测定黑沙蒿中主要化学成分黄酮类化合物的方法.该方法可校正混浊背景倾斜度的影响,并能消除重叠吸收曲线的干扰.方法的线性范围为1.12～13.44 μg/mL,相关系数r=0.9999,适用于植物中总黄酮的测定.     

The Chemical Speciation and Behavior of Mercury and Selenium in the Insoluble Fraction of Striped Dolphin Liver

Most of the mercury and selenium exist in the insoluble fraction of dolphin liver. After the insoluble fraction was digested by alkaline protease in the presence of 1% SDS, approximately 50% of Hg and Se consisted in the supernatant and the others in the residue. Gel filtration chromatography of the hydrolysate showed that 96% of Hg and 87% of Se were combined with the high molecular weight proteins stably, which cannot be substituted by the complex reagents.Mercury and selenium in the residue were confirmed as HgSe crystal.     

微量元素硒及有机硒药物研究进展

从硒的营养学、硒的免疫学、硒的肿瘤学三个方面概括了微量元素硒的研究进展。研究表明，一些含硒有机化合物具有抗氧化性、抗炎、防癌、抗癌等药用前景。     

La0.8Sr0.2Ga0.8Mg0.2O3与La0.8Sr0.2Ga0.8Mg0.15Co0.05O3电导的对比

采用固相合成法制备了La0.8Sr0.2Ga0.8Mg0.2O3(LSGM8282)和La0.8Sr0.2Ga0.8Mg0.15Co0.05O3 (LSGMC5), 利用四电极交流阻抗法和Hebb-Wagner 极化法对比研究了两种材料的总电导率和电子电导率. 实验结果表明, LSGM8282 的总电导率与氧分压无明显依赖关系, 而LSGMC5 的总电导率在高氧分压区随氧分压降低而增加,在中等氧分压区域基本保持不变. 在973-1173 K的温度范围内, LSGM8282的自由电子电导率以及电子空穴电导率的氧分压级数分别为-1/4和1/4.在1073-1173 K的温度范围内, LSGMC5的自由电子电导率以及电子空穴电导率的氧分压级数分别为-1/4和约为1/8, 表明LSGMC5的空穴产生机制可能与LSGM8282不同. LSGM8282 的氧离子电导率与氧分压无关, 而LSGMC5 的氧离子电导率在高氧分压区随氧分压的减小而增加.     

Intramolecular oxyselenenylation and deselenenylation reactions in water, conducted by employing polymer-supported arylselenenyl bromide

After immobilizing arylselenenyl bromide on polymer resin, the oxyselenenylation reaction of olefin was carried out in water. An amphiphilic polymer-supported arylselenenyl bromide was employed, and various intramolecular oxyselenenylation and deselenenylation reactions proceeded smoothly in water in fair chemical yields (up to an 83% yield).     

土壤环境中的硒对人和动物健康的影响

硒是人和动物必需的微量元素之一。土壤中的硒含量过多或过低，人和 动物都会出现地方性疾病。土壤中硒的含量与土壤母质、地形、气候条件和土壤条件性质等有关，调节土壤性质可以改善作物的含硒量。防治硒缺额症和硒中毒症，每天必需摄入适量的硒，以100－200μg为宜，但人体对硒的需要量也与食物成分有关。     

全反射X—射线荧光光谱的原理和应用

本文综述全反射－Ｘ射线荧光光谱分析的进展，原理，仪器和应用。参考文献６７篇。     

还原性的类立方烷型金属有机原子簇[M_4(μ~3-Se)_4(η-C_5H_4R)_4](M=Mo,R=Pr~i;M=Cr,R=Me)的合成、晶体结构和电子性质

类立方烷型金属原子簇化合物M_4E_4(M为过渡金属,E为硫属元素)的研究长期以来受到重视,其主要原因有二:(1)一些类立方烷型金属原子簇(如Fe_4S_4及Fe-Mo-S原子簇)在生物体系(如固氮酶、铁氧还蛋白)中有重要意义;(2)由于可以方便地对M或E作系列性的改变,因而M_4E_4成为研究原子簇化合物的电子结构及检测各种有关的理论假设的重要模型化合物。     

Synthesis of two new crown ethers containing selenium and the complexation of one of them with silver and lead

Two new macrocyclic crown ethers containing one or two selenium donor atoms have been prepared. Diselena-18-crown-6 (2) was found to transport silver ions through a methylene chloride bulk membrane at about the same rate as the analogous dithia- (3) and diaza-18-crown-6 (4) compounds and transported lead ions about the same as dithia-18-crown-6 but better than diaza-18-crown-6.