纳米复合材料吸附剂用于水中痕量金属的测定

为实现地质勘查水体中痕量金属元素的同时检测,建立基于氧化石墨烯/氧化多壁碳纳米管(GO/MWCNTs)吸附剂的分散固相微萃取程序同时测定水中痕量金属的方法,并对方法的检测性能进行研究。结果表明,用GO与MWCNTs比例为1∶5制备的GO/MWCNTs复合材料作为吸附剂,水样pH值为8、水样体积为60 mL,搅拌时间为5 min的条件下进行分散固相微萃取,此时对水中痕量重金属吸附回收率超过95%;通过XRF对萃取后的材料进行检测,金属元素在荧光图谱中显示的较为明显,且谱线间相互不干扰。

磺化卟啉合成及其在痕量金属离子测定中的研究进展

针对水溶性磺化卟啉在痕量组分的测定中可作为超高灵敏显色剂,重点介绍了磺化卟啉的合成方法及其在痕量金属离子测定中的研究进展。

大鸨羽毛及粪便中重金属测定

通过原子荧光形态分析仪、DMA—80测汞仪、电感耦合等离子体发射光谱仪对大鸨羽毛及粪便中9种重金属进行测定,表明此种方法简便可靠、高效、精确。可用于生物体内痕量元素的长期跟踪调查,对于保护大鸨生存环境状况,改善大鸨正常生长、繁殖、发育很有价值。

活性炭富集火焰原子吸收法测定水中多种元素

本文建立了一种活性炭同时富集水中铅、镉、铜、锌、铁、锰、镍、锶、铊的技术,结合火焰原子吸收法,可测定水中超痕量水平的上述金属。对9份平行样品测定的变异系数为2.5～10.5%,样品加标回收率为78.5～114%。用本法测定了自来水、河水、深井水、雨水等样品,除雨水中未检出铊外,均检出了上述元素。

The Use of Multiwalled Carbon Nanotubes Mini Column for Preconcentration of Trace Metal Ions in Tap Water of Khartoum City and Their Determination by Flame Atomic Absorption Spectrometry （FAAS）

The adsorption behavior of multiwalled carbon nanotubes （MWNTs） toward heavy elements has been investigated systemically, and a new method has been developed for the determination of trace elements in water samples based on preconcentration with mini-column packed with MWNTs prior to its determination by flame atomic absorption spectrometry （FAAS） The recommended parameters of proposed method influencing the preconcentration of the analytes, such as pH of the sample, sample flow rate and volume, elute solution and interfering ions, have been used. Under the optimized conditions, the calibration graphs were linear with the correlation coefficient range 0.9981-0.9995. According to the results, the metals were found 0.019-0.051, 0.011-0.031, 0.00-0.081, 0.00-0.0002, 0.007-0.0925, 0.00-0.0104 μg/L in water samples for Pb, Mn, Zn, Cd, Fe, Cu respectively. The percentage relative standard deviation （%RSD） for five replicate samples were 〈 5% in all cases. The method has been successfully applied to the determination of trace elements in some environmental samples with satisfactory results.

用重铬酸钾化学改进剂和两端封闭石墨管的电热原子吸收？…

文章介绍了用电热原子吸收法测定葡萄酒中铝时，精密度和准确度的提高。试验用重铬权钾做化学改进剂并与常用的普通化学改进剂进行了比较，也比较了横向两端封闭的加热石墨管的标准石墨管的原子化行为。实践证明方法比用标准石墨管和不用化学改进剂测铝，在准确度和灵敏度方面都有很大改进。