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利用阳离子交换法分离Ac/Ra的实验研究 被引量:1
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作者 龚籽月 於国兵 +6 位作者 闻德运 顾先宝 许丰 陈军 杨晓冉 盛六四 刘付轶 《核电子学与探测技术》 CAS 北大核心 2021年第1期121-125,共5页
采用阳离子交换法分离Ac/Ra,在AG50W-X8树脂中使用檬酸为载带剂,HNO3为浓度梯度洗脱剂,对228Ra标准溶液中的228Ac/228Ra和稳定的Ba/La混合标准溶液进行分离实验。结果表明:在HNO3浓度为3mol/L时,可分离洗脱Ra,且其洗脱率可达到90%以上;... 采用阳离子交换法分离Ac/Ra,在AG50W-X8树脂中使用檬酸为载带剂,HNO3为浓度梯度洗脱剂,对228Ra标准溶液中的228Ac/228Ra和稳定的Ba/La混合标准溶液进行分离实验。结果表明:在HNO3浓度为3mol/L时,可分离洗脱Ra,且其洗脱率可达到90%以上;在HNO3浓度为6mol/L时,可分离洗脱Ac,且其洗脱率可达95%。同时,在HNO3浓度为3 mol/L时,Ba的洗脱率可以达到100%;在HNO3浓度为6mol/L时,La的洗脱率只达到85%。 展开更多
关键词 阳离子树脂 Ac/Ra分离 Γ能谱 洗脱率
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Characterization of products from photooxidation of toluene 被引量:2
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作者 HAO Li-qing WANG Zhen-ya +4 位作者 FANG Li ZHANG Wei-jun WANG Wei LI Cheng-xiang sheng liu-si 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2006年第5期903-909,共7页
Photooxidation reaction of toluene in smog chamber systems was initiated by the UV radiation of tolucne/CH5ONO/NOx mixtures. The products of the photooxidation reaction of toluene and its subsequent reactions were ana... Photooxidation reaction of toluene in smog chamber systems was initiated by the UV radiation of tolucne/CH5ONO/NOx mixtures. The products of the photooxidation reaction of toluene and its subsequent reactions were analyzed directly utilizing Fourier transform infrared spectrometer (FTIR). Detailed assignments to FTIR spectrum of gas-phase products were given. The information of some important functional groups in the products, such as, carbonyl groups (C-O), hydroxyl groups (-OH), carboxylic acid (- COOH), C-C bonding, N O bonding and C-H bonding (C H), was got from this analysis. These results were compared to those analyzed by aerosol time of flight mass spectrometer (ATOFMS). It was found that there are some differcnccs between FTIR analysis of gas-phase products and that of particle-phase, for example, the products with carbonyl groups, which were connected to unsaturated chemical bonds, was relatively higher in the gas phase, while kctoncs, aldehydes, carboxylic acid and organonitrates were the dominant functional groups in the aerosol-phase reaction products. The possible reaction pathways of some important products in the gas phase were also discussed. 展开更多
关键词 TOLUENE PHOTOOXIDATION secondary organic aerosol Fourier transform infrared spectrometer smog chamber
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UV Photoionization Study of the Ethyl Radical
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作者 WANG Jing WEI Li-xia +9 位作者 YANG Bin YANG Rui HUANG Chao-qun SHAN Xiao-bin sheng liu-si ZHANG Yun-wu QI Fei YAO Chun-de LI Qi JI Qing 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2006年第3期375-378,共4页
The ethyl radical was observed in a low-pressure premixed gasdine/oxygen/argon flame by using tunable vacuum ultraviolet photoionization mass spectrometry. The ionization energy(IE) of the ethyl radical was derived ... The ethyl radical was observed in a low-pressure premixed gasdine/oxygen/argon flame by using tunable vacuum ultraviolet photoionization mass spectrometry. The ionization energy(IE) of the ethyl radical was derived to be(8. 24 ± 0. 02) eV from the photoionization efficiency curve. In addition, a high-level ab initio Gaussian-3 (G3) method was used to calculate the energies of the radical and its cation. The calculated adiabatic ionization potential is 8. 17 eV, which is in good agreement with the experimental value. 展开更多
关键词 Ethyl radical Photoionization efficiency spectra Ionization energy
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