食品中铝检测方法研究进展

介绍了食品中铝的来源,并综述了近十年中食品中铝测定方法的研究进展,包括电感耦合等离子体原子发射光谱法、电感耦合等离子体质谱法、石墨炉原子吸收光谱法、电化学分析法以及分光光度法等方法(引用文献75篇)。     

催化分光光度法测定土壤中痕量碘

化探样品中碘含量的检测常用方法有流动注射-光度法、催化分光光度法、离子色谱法和电感耦合等离子体质谱法等。催化分光光度法测定土壤中痕量碘的方法,准确度和精密度不高。本工作在文献基础上,对方法中样品的分解温度、分解时间、显色波长、显色温度、显色时间、显色酸度、四碱用量、氯胺T用量等各个条件进行了优化试验,确定     

高效毛细管电泳法检测鸡肉中青霉素类药物残留量

用4种不同的样品前处理方法,即①磷酸二氢钠萃取法(SE)、②磷酸二氢钠萃取-固相萃取法(SE-SPE)、③基质固相分散萃取法(MSPDE)和④基质固相分散萃取-固相萃取法(MSPDE-SPE)对鸡肉样品做前处理,用高效毛细管电泳测定试液中青霉素、氨苄青霉素和阿莫西林等3种药物的残留量。回收试验和色谱分离结果表明:方法②用于高效毛细管电泳法同时测定鸡肉样品中3种青霉素类药物的样品前处理更为合适。方法的加标回收率在73.1%～95.9%之间,相对标准偏差(n=5)在2.9%～9.8%之间。     

氢氧化铝共沉淀分离-火焰原子吸收光谱法测定富镓渣中镓

稀有金属镓是生产半导体元件的重要材料,原料90%以上来自有色金属富镓渣。镓的分析方法除了经典的罗丹明B光度法外,还可采用火焰原子吸收光谱法测定。火焰原子吸收光谱法测定镓灵敏度不高,样品预处理通常采用萃取-反萃取分离富集镓。萃取-火焰原子吸收光谱法测定镓,虽然方法简单,但预处理操作流程长,萃取剂污染环境,危害人畜健康。近年也见有机沉淀分离富集镓的报道。方法     

梅特勒-托利多倾力协办2011中国第三方检测实验室发展论坛

由中国检验检疫科学研究院主办的第三届中国第三方检测实验室发展论坛于2011年9月8日至9日在河北承德隆重举行。这是自该论坛创立以来首次移师北京之外举办,也是梅特勒-托利多公司连续三届全程参与协办,鼎力支持中国第三方检测行业发展。     

2011年冶金及材料分析检测人员培训通知

为提高我国分析检测人员的技术能力,确保实验室向社会提供检测结果的准确性和可靠性,中国金属学会分析测试分会协同钢铁研究总院分析测试培训中心将于2011年将在北京.钢铁研究总院举办四期包含拉伸试验、XRF、ICP、火花光谱、金相分析以及冶金材料化学成分分析测量不确定度评定等共十二个班次的"冶金及材料分析检测技术培训班",     

真空紫外灯单光子电离源飞行时间质谱仪的研制

研制了真空紫外灯单光子电离源飞行时间质谱仪(Vacuum ultraviolet single photon ionization time-offlight mass spectrometer,VUV-SPI-TOFMS),包括真空系统、毛细管进样系统、真空紫外灯电离源、垂直加速反射式飞行时间质量分析器和数据采集系统...     

食品中合成色素快速检测仪器的研制

基于人工合成色素在可见光区的光吸收及偏最小二乘变量筛选法,研制出合成色素速测仪器,并应用于饮料、糖果、果冻、调色酒等食品中合成色素的快速检测.速测仪具有便携、功耗低、操作简便、检测时间短并可同时对多种人工合成色素进行实时现场快速检测、检测结果准确等优点.对样品中5种食用合成色素柠檬黄、日落黄、胭脂红、苋菜红和亮蓝的检测...     

Theoretical Studies on the Intermolecular Interactions of Aza-calix[2]arene[2]-triazines with RDX

Six fully optimized structures of the aza-calix[2]arene[2]-triazines/RDX supramo-lecular complexes have been obtained at the DFT-B3LYP/6-311++G** level,and the corresponding intermolecular interactions have been investigated using the B3LYP,mPWPW91 and MP2 methods at the 6-311++G** level,respectively.The natural bond orbital(NBO) and atoms in molecules(AIM) analyses have been performed to reveal the origin of interactions.To our interest,the result indicates that the strongest interaction is up to -22.34 kJ/mol after basis set superposition error(BSSE) and zero point energy(ZPE) correction at the MP2/6-311++G** level.Furthermore,the intermolecular interactions between aza-calix[2]arene[2]-triazines with the substituted amidos and RDX are stronger than those of other complexes.Thus,the complexes with amidos can be used as the candidates to increase the stability of explosive and eliminate the explosive wastewater.     

A DFT Study on the Stable Structures and Dissociation Mechanism of C3O6 Cluster

Using geometrical optimization and DFT method at the B3LYP/6-31G (d) level, nineteen equilibrium geometries were identified, and three transition states of dissociation reaction of C3O6 clusters were also found. The vibrational frequencies and intrinsic reaction coordinate (IRC) verification at the same level were computed to verify the transitions. And then we calculated the dissociation energies and analyzed the dissociation channels. The computational results show that the dissociation energies of C3O6 isomers relative to three CO2 are between 1.509 × 103 and 10.61 × 103 kJ·kg-1, and the energy barriers of the reactions are 92.857, 131.138 and 185.793 kJ·mol-1. Both the high dissociation energies and high energy barriers show that C3O6 clusters studied in this paper are stable enough to be used as high-energy-density materials.