High-precision uranium-series dating of lacustrine carbonates from Daihai Lake

Ages of small aragonite samples retrieved from sediments from the Daihai Lake are determined by using the Thermal Ionization Mass Spectrometry (TIMS) technique. The ages of the samples range from (8740±601) to (10446 ±489) a, with a precision of 2%–3% for non-corrected dating ages and 4.7%-9.8% for corrected ages respectively, and are consistent within the deviation range. At about 10.5 ka BP, the grain-size of the sediments coarsens sharply, the frequency curves of grain-size distribution show coarse grain dominated single-double kurtosis, indicating cooling, decreased hydrodynamic conditions and increased wind influence procedure. This is in good agreement with previous results obtained from the Daihai Lake, which suggests that the climate was cold and the lake surface was shrinking. The TIMS ages of the sediments are therefore believed to be credible.     

气相色谱-质谱法测定茶油中的脂肪酸

用氢氧化钾－甲醇酯交换法甲酯化处理油样,以气相色谱－质谱－计算机联用仪对广西三江茶油中的脂肪酸成分进行分析,共分离出6种成分,分别为肉豆蔻酸,十六碳烯（9C）酸,棕榈酸,亚油酸,油酸 硬脂酸,其中油酸含量为82．35％。     

铊的活性碳吸附分离-紫外分光光度法测定

研究并改进了可见分光光度法测定铊在HC l介质中活性碳吸附铊及草酸胺解吸铊的分离条件,提出了八羟基喹啉紫外分光光度法测定铊的新方法.以八羟基喹啉为配合剂与铊(Ⅲ)形成的配合物,在λ=230 nm处有最大吸收,Tl(Ⅲ)质量浓度在0~24μg.25 mL-1范围符合比耳定律.回收率在96.5%~101.8%之间.     

山西产各类饮用酒中微量元素测定及研究

运用等离子体发射光谱法测定了十六种山西省各地产的烧酒与色酒中九种元素的含量，并对测试数据进行了综合评估和统计处理。     

傅立叶变换近红外技术测定卷烟中的有效钾

有效钾是近年才提出的一项衡量卷烟燃烧性的参数,烟叶中有效钾含量是衡量烟叶燃烧性的一个关键指标,常规方法分析有效钾需要测定钾离子、氯离子和硫酸根离子的含量,再计算出有效钾.常规方法引入化学试剂存在污染,方法复杂耗时,不利于卷烟样品的检测及质量控制.本文根据卷烟的化学分析数据和卷烟样品粉末的近红外光谱建立了卷烟有效钾的近红外分析技术,能准确测定和预测卷烟的有效钾含量,了解卷烟的燃烧特性.     

Characterization of Pentachlorophenol in Soil by Liquid Chromatography-Mass Spectrometry

A simple, accurate and sensitive method for characterization of pentachlorophenol in soil was presented. The method included Soxhlet extraction using extracting agent of methanol/water/triethylamine (80∶20∶2), decontamination using solid-phase extraction (SPE) column and characterization by liquid chromatography-mass spectrometry (LCMS). The developed analytical method was successfully used to the determination of pentachlorophenol in soil samples.     

石墨炉原子吸收法测定中草药中的硒

以Ｐｄ（ＮＯ３）２－Ｔｒｉｔｏｎｘ－１００作为硒的基体改进剂，可使Ｓｅ的灰化温度从４００℃提高到１２００℃，吸光度增加２．９２倍。用Ｚｅｅｍａｎ效应背景校正法，有效地克服了共存物Ｆｅ、Ｐ等的干扰。检出限为０．１６ｎｇ，线性范围０．２￣２．４ｎｇ，相关系数ｒ为０．９９３１。     

纳米氧化锌的制备表征及其对Cu(Ⅱ)、Co(Ⅱ)、Fe(Ⅲ)的吸附

以Zn(Ac)2.2H2O和H2C2O4.2H2O为材料,固相合成氧化锌纳米材料.以原子吸收分光光度法(AAS)为手段检测了纳米氧化锌对Cu(Ⅱ),Co(Ⅱ),Fe(Ⅲ)的吸附洗脱性能.结果表明:在碱性条件下纳米氧化锌的吸附效果较酸性条件下好.因此,选择在酸性条件下对金属离子进行洗脱.实验测得氧化锌对上述金属离子的静态吸附容量分别为:15.3、19.1和19.5mg/g.     

钼铁厂固体废物浸出液中钼的测定

用石墨炉原子吸收光谱法测定钼铁厂固体废物浸出液中的钼,当选择合适实验条件的情况下,钼的测定灵敏度较高,校准曲线的相关系数大于0.999,精密度较好,方法的检出下限为0.6μg/L,定量测定范围2.4～60μg/L,测定结果令人满意.