Introduction Since it was discovered in 1968,liquid membrane separation technique has been widely studied,particularly in separating or recovering some metal ions.It is a novel study that trace substances in analytica...Introduction Since it was discovered in 1968,liquid membrane separation technique has been widely studied,particularly in separating or recovering some metal ions.It is a novel study that trace substances in analytical chemistry are enriched by liquid membrane.There have been few reports on enriching cerium by emulsion liquid membrane (ELM) now.Therefore,authors studied the liquid membrane methed for enriching trace cerium.The sensibility measuring cerium by spectrophotometry was increased greatly.展开更多
提出了电感耦合等离子体原子发射光谱法(ICP-AES)测定核级316不锈钢中痕量铈的方法。取0.100 0 g样品于烧杯中,加入15 m L现配体积比为1∶3∶4的硝酸-盐酸-水混酸溶液,置于150℃电热板上消解30 min,完全溶解后加入5 m L 30%(质量分数)...提出了电感耦合等离子体原子发射光谱法(ICP-AES)测定核级316不锈钢中痕量铈的方法。取0.100 0 g样品于烧杯中,加入15 m L现配体积比为1∶3∶4的硝酸-盐酸-水混酸溶液,置于150℃电热板上消解30 min,完全溶解后加入5 m L 30%(质量分数)过氧化氢溶液,恒温3 min后取下冷却至室温,用水定容至100 m L。设置仪器射频功率为1 150 W,雾化气流量为0.45 L·min^(-1),测量铈元素在404.076 nm分析谱线处的响应强度,基质匹配法定量。结果表明:铈的质量浓度在100 mg·L^(-1)以内与对应的响应强度呈线性关系,检出限(3s)为0.000 4%。4个样品精密度试验所得测定值的相对标准偏差(n=10)均小于5.0%。按照标准加入法进行回收试验,回收率为95.5%~103%;采用GH56(屑样)铁镍基标准物质进行准确度验证,测定值与认定值基本一致。展开更多
The behavior of growth and coarsening of T-1(Al2CuLi) precipitates was comparatively studied by means of TEM technique in two Al-Li alloys 2090 and 2090+Ce (with cerium content less than 0.1% in mass fraction). Statis...The behavior of growth and coarsening of T-1(Al2CuLi) precipitates was comparatively studied by means of TEM technique in two Al-Li alloys 2090 and 2090+Ce (with cerium content less than 0.1% in mass fraction). Statistical analysis results show that T-1 precipitates in alloy 2090+Ce have smaller aspect ratio, which is connected with the more intersections between different T-1 variants in this alloy. It is also found that the variation of maximum length of T-1 precipitates with aging time can be obviously divided into two stages of growth and coarsening. The diffusion coefficients of solute atoms of Cu and Li are calculated via growth kinetics curves of T-1 precipitates. The results show that the diffusion of atom Cu plays a more important role in the formation of T-1 precipitates.展开更多
文摘Introduction Since it was discovered in 1968,liquid membrane separation technique has been widely studied,particularly in separating or recovering some metal ions.It is a novel study that trace substances in analytical chemistry are enriched by liquid membrane.There have been few reports on enriching cerium by emulsion liquid membrane (ELM) now.Therefore,authors studied the liquid membrane methed for enriching trace cerium.The sensibility measuring cerium by spectrophotometry was increased greatly.
文摘提出了电感耦合等离子体原子发射光谱法(ICP-AES)测定核级316不锈钢中痕量铈的方法。取0.100 0 g样品于烧杯中,加入15 m L现配体积比为1∶3∶4的硝酸-盐酸-水混酸溶液,置于150℃电热板上消解30 min,完全溶解后加入5 m L 30%(质量分数)过氧化氢溶液,恒温3 min后取下冷却至室温,用水定容至100 m L。设置仪器射频功率为1 150 W,雾化气流量为0.45 L·min^(-1),测量铈元素在404.076 nm分析谱线处的响应强度,基质匹配法定量。结果表明:铈的质量浓度在100 mg·L^(-1)以内与对应的响应强度呈线性关系,检出限(3s)为0.000 4%。4个样品精密度试验所得测定值的相对标准偏差(n=10)均小于5.0%。按照标准加入法进行回收试验,回收率为95.5%~103%;采用GH56(屑样)铁镍基标准物质进行准确度验证,测定值与认定值基本一致。
文摘The behavior of growth and coarsening of T-1(Al2CuLi) precipitates was comparatively studied by means of TEM technique in two Al-Li alloys 2090 and 2090+Ce (with cerium content less than 0.1% in mass fraction). Statistical analysis results show that T-1 precipitates in alloy 2090+Ce have smaller aspect ratio, which is connected with the more intersections between different T-1 variants in this alloy. It is also found that the variation of maximum length of T-1 precipitates with aging time can be obviously divided into two stages of growth and coarsening. The diffusion coefficients of solute atoms of Cu and Li are calculated via growth kinetics curves of T-1 precipitates. The results show that the diffusion of atom Cu plays a more important role in the formation of T-1 precipitates.
