Concentrations of sixteen rare earth elements（REEs） in PM2.5 and potential-source samples, collected in Nanchang city in mid-September 2013, were determined by inductively coupled plasma mass spectrometry（ICP-MS）....Concentrations of sixteen rare earth elements（REEs） in PM2.5 and potential-source samples, collected in Nanchang city in mid-September 2013, were determined by inductively coupled plasma mass spectrometry（ICP-MS）. The results showed that the concentrations of total REEs（ΣREE） ranged from 78.76 to 1351 ng/mg. The order of REEs in PM2.5 samples showed the anthropogenic effects, Ce and Eu were affected more than the other REEs according to the enrichment factors. The results of chondrite-normalized REEs patterns and characteristic parameters showed evident light REEs fractionation, and positive anomalies of Ce and Eu in PM2.5. The other non-local pollution sources affected the PM2.5 samples, according to the triangular diagram of La, Ce and Sm compositions and plot of ΣREE vs δEu. Moreover, plot of（La/Sm）N vs（Gd/Yb）N revealed the effects of local sources. In conclusion, the REEs in potential-source samples were close to the background of local soil, while the REEs in PM2.5 samples in Nanchang city were jointly affected by the investigated local sources and other non-local sources.展开更多
为研究山东电网绝缘子表面污秽成分的特点,选取不同运行环境、不同电压等级和不同电场的绝缘子,采用离子色谱等方法分析污秽中的主要成分。研究结果表明:自然降水的冲刷效果,造成绝缘子表面难溶性盐CaSO_4的富集特性比易溶性盐显著;重...为研究山东电网绝缘子表面污秽成分的特点,选取不同运行环境、不同电压等级和不同电场的绝缘子,采用离子色谱等方法分析污秽中的主要成分。研究结果表明:自然降水的冲刷效果,造成绝缘子表面难溶性盐CaSO_4的富集特性比易溶性盐显著;重污区绝缘子污秽中主要成分含量明显高于其他环境;相同运行环境,500 k V绝缘子污秽中主要离子成分的含量明显高于220 k V、110 k V绝缘子;直流电场对污秽的吸附能力比交流电场强,但对污秽成分的影响不大。采用富集因子分析方法,分析了污秽中主要金属元素Ca的来源,发现其主要来源于人为污染,且在不同运行环境下受人为污染的程度不同,以重污区人为污染程度最严重。展开更多
基金Project supported by the National Natural Science Foundation of China(21477042,21377042)the Natural Science Foundation of Fujian Province(2016J01065)
文摘Concentrations of sixteen rare earth elements（REEs） in PM2.5 and potential-source samples, collected in Nanchang city in mid-September 2013, were determined by inductively coupled plasma mass spectrometry（ICP-MS）. The results showed that the concentrations of total REEs（ΣREE） ranged from 78.76 to 1351 ng/mg. The order of REEs in PM2.5 samples showed the anthropogenic effects, Ce and Eu were affected more than the other REEs according to the enrichment factors. The results of chondrite-normalized REEs patterns and characteristic parameters showed evident light REEs fractionation, and positive anomalies of Ce and Eu in PM2.5. The other non-local pollution sources affected the PM2.5 samples, according to the triangular diagram of La, Ce and Sm compositions and plot of ΣREE vs δEu. Moreover, plot of（La/Sm）N vs（Gd/Yb）N revealed the effects of local sources. In conclusion, the REEs in potential-source samples were close to the background of local soil, while the REEs in PM2.5 samples in Nanchang city were jointly affected by the investigated local sources and other non-local sources.
文摘为研究山东电网绝缘子表面污秽成分的特点,选取不同运行环境、不同电压等级和不同电场的绝缘子,采用离子色谱等方法分析污秽中的主要成分。研究结果表明:自然降水的冲刷效果,造成绝缘子表面难溶性盐CaSO_4的富集特性比易溶性盐显著;重污区绝缘子污秽中主要成分含量明显高于其他环境;相同运行环境,500 k V绝缘子污秽中主要离子成分的含量明显高于220 k V、110 k V绝缘子;直流电场对污秽的吸附能力比交流电场强,但对污秽成分的影响不大。采用富集因子分析方法,分析了污秽中主要金属元素Ca的来源,发现其主要来源于人为污染,且在不同运行环境下受人为污染的程度不同,以重污区人为污染程度最严重。
