地质样品中金富集分离方法的最新进展

综述了近年来地质样品中金富集分离方法的进展 ,包括活性炭吸附法、泡沫塑料富集分离法、载体泡塑富集分离法、萃取色层富集分离法、离子交换富集分离法、离子交换纤维素富集分离法、溶剂萃取富集分离法等 ,并对出现的新工艺、新技术进行了重点评述。参考文献 87篇。

金的湿法富集分离方法的进展

总结了1980—1988年金的湿法富集分离方法,包括溶剂萃取法;萃取色层法;离子交换树脂分离法;泡沫塑料富集分离法;巯基棉富集分离法;活性炭吸附富集分离法;沉淀富集分离法;试金法富集分离法等。阐述了每种方法的发展概况。

醋酸丁酯富集碘量法快速测定金

研究了金的富集分离方法,其方法是:通过条件实验,采用醋酸丁酯富集金,分离了干扰元素,并用碘量法定量测定金,解决了含量为ω(Au)≥1×10-6的金矿石的快速定量测试问题.通过实验,选择了最佳工作条件:50%的溴化钾用量为1mL,萃取时的相比为1∶4,酸度为20%;保护剂为20%的氯化钠,其用量为1mL.此外,并对标准物质和样品进行测定.研究结果表明:该方法操作简单,流程短,相对标准偏差小于3%.在无原子吸收仪器的小型实验室,运用该法可快速、定量测定金的含量.

天然茶氨酸的制备及应用

本文从沉淀法、离子交换树脂法、大孔树脂法、膜富集分离法及色谱制备法五方面综述了近年来天然茶氨酸制备与应用的研究进展,为进一步开发研究天然茶氨酸提供可以利用的信息。

A Novel Magnetic Separation Oxygen-enriched Method and the Influence of Temperature and Magnetic Field on Enrichment

A novel oxygen-enriched method is presented. Using two opposite magnetic poles of two magnets with certain distance forms a magnetic space having a field intensity gradient near its borders. When air injected into the magnetic space outflows from the magnetic space via its borders, oxygen molecules in air will experience the interception effect of the gradient magnetic field, but nitrogen molecules will outflow without hindrance. Thereby the continuous oxygen enrichment is realized. The results show that the maximum increment of oxygen concentration reaches 0.49% at 298 K when the maximum product of magnetic flux density and field intensity gradient is 563T^2/m. The enrichment level is significantly influenced by the gas temperature and the magnetic field. The maximum increment of oxygen concentration drops to 0.16% when the gas temperature rises to 343 K, and drops to 0.09% when the maximum product of magnetic flux density and gradient is reduced to 101 T^2/m from 563 T^2/m.