以三巯基丙酸（MPA）为表面修饰剂,采用水相合成法制备了稳定且具有良好光学性质的Mn掺杂Zn S量子点。在p H 7.4的磷酸缓冲液中,盐酸异丙嗪的加入使MPA包裹的Mn掺杂Zn S量子点的室温磷光发生明显猝灭,据此建立了一种检测盐酸异丙嗪的新...以三巯基丙酸（MPA）为表面修饰剂,采用水相合成法制备了稳定且具有良好光学性质的Mn掺杂Zn S量子点。在p H 7.4的磷酸缓冲液中,盐酸异丙嗪的加入使MPA包裹的Mn掺杂Zn S量子点的室温磷光发生明显猝灭,据此建立了一种检测盐酸异丙嗪的新方法。磷光猝灭强度（ΔRTP）与盐酸异丙嗪浓度呈良好线性,其线性范围为3.2~32μmol/L与32~160μmol/L,相关系数分别为0.998与0.999,检出限为0.553μmol/L。将该方法用于人血清与尿液中盐酸异丙嗪的检测,加标回收率为96.4%~103.1%,结果满意。展开更多
In mid-September 2013, PM2.5 samples were collected at six sites in Nanchang, Jiangxi Province, China, to quantify nine water-soluble ions （Ca2＋, Mg2＋, K＋, Na＋, NH4＋, SO42-, Cl-, F , NO3 ）, 29 trace elements （...In mid-September 2013, PM2.5 samples were collected at six sites in Nanchang, Jiangxi Province, China, to quantify nine water-soluble ions （Ca2＋, Mg2＋, K＋, Na＋, NH4＋, SO42-, Cl-, F , NO3 ）, 29 trace elements （Ba, Zn, Pb, Ni, Mo, Cr, Cu, Sr, Sb, Rb, Cd, Bi, Zr, V, Ga, Li, Y, Nb, W, Cs, Tl, Sc, Co, U, Hf, In, Re, Be, and Ta）, and to characterize Pb isotopic ratios （^207pb/^206pb, ^208pb/^206pb, and ^207pb/^204pb） for identifying the main source（s） of Pb. The results showed that the average daily PM2.5 concentration （53.16 ± 24.17） Dg/m3 was within the secondary level of the Chinese ambient air quality standard. The combined concentrations of SO42-, NH4＋, and NO3- to total measured water-soluble ion concentrations in PM2.5 ranged from 79.40% to 95.18%, indicating that anthropogenic sources were significant. Coal combustion and vehicle emissions were both contributors to PM2.5 based on the NO3-/SO4^2- ratios. Wushu School experienced the lowest concentrations of PM2.s and most trace elements among the six sampling sites. Enrichment factor results showed that TI, Cr, In, Cu, Zn, Pb, Bi, Ni, Sb, and Cd in PM2.5 were affected by anthropogenic activities. Cluster analysis suggested that Cd, Sb, Pb, Re, Zn, Bi, Cs, Tl, Ga, and In were possibly related to coal combustion and vehicle exhaust, while Ni, Nb, Cr, and Mo may have originated from metal smelting. Pb isotopic tracing showed that coal dust, cement dust, road dust and construction dust were the major Pb sources in PM2.5 in Nanchang. Combined, these sources contributed an average of 72.51% of the Pb measured, while vehicle exhaust accounted for 27.49% of Pb based on results from a binary Pb isotope mixed model,展开更多
文摘以三巯基丙酸（MPA）为表面修饰剂,采用水相合成法制备了稳定且具有良好光学性质的Mn掺杂Zn S量子点。在p H 7.4的磷酸缓冲液中,盐酸异丙嗪的加入使MPA包裹的Mn掺杂Zn S量子点的室温磷光发生明显猝灭,据此建立了一种检测盐酸异丙嗪的新方法。磷光猝灭强度（ΔRTP）与盐酸异丙嗪浓度呈良好线性,其线性范围为3.2~32μmol/L与32~160μmol/L,相关系数分别为0.998与0.999,检出限为0.553μmol/L。将该方法用于人血清与尿液中盐酸异丙嗪的检测,加标回收率为96.4%~103.1%,结果满意。
基金This work was supported by the National Natural Science Foun- dation of China （21377042, 21477042） and the Natural Science Foundation of Fujian Province （2016 J01065）. The authors express their heartfelt thanks to the colleagues who participated in the sampiing work. Mr. James Ing, a native English speaker from the UK is gratefully acknowledged for reviewing this paper prior to resub- mission. We thank the anonymous reviewers for their constructive comments.
文摘In mid-September 2013, PM2.5 samples were collected at six sites in Nanchang, Jiangxi Province, China, to quantify nine water-soluble ions （Ca2＋, Mg2＋, K＋, Na＋, NH4＋, SO42-, Cl-, F , NO3 ）, 29 trace elements （Ba, Zn, Pb, Ni, Mo, Cr, Cu, Sr, Sb, Rb, Cd, Bi, Zr, V, Ga, Li, Y, Nb, W, Cs, Tl, Sc, Co, U, Hf, In, Re, Be, and Ta）, and to characterize Pb isotopic ratios （^207pb/^206pb, ^208pb/^206pb, and ^207pb/^204pb） for identifying the main source（s） of Pb. The results showed that the average daily PM2.5 concentration （53.16 ± 24.17） Dg/m3 was within the secondary level of the Chinese ambient air quality standard. The combined concentrations of SO42-, NH4＋, and NO3- to total measured water-soluble ion concentrations in PM2.5 ranged from 79.40% to 95.18%, indicating that anthropogenic sources were significant. Coal combustion and vehicle emissions were both contributors to PM2.5 based on the NO3-/SO4^2- ratios. Wushu School experienced the lowest concentrations of PM2.s and most trace elements among the six sampling sites. Enrichment factor results showed that TI, Cr, In, Cu, Zn, Pb, Bi, Ni, Sb, and Cd in PM2.5 were affected by anthropogenic activities. Cluster analysis suggested that Cd, Sb, Pb, Re, Zn, Bi, Cs, Tl, Ga, and In were possibly related to coal combustion and vehicle exhaust, while Ni, Nb, Cr, and Mo may have originated from metal smelting. Pb isotopic tracing showed that coal dust, cement dust, road dust and construction dust were the major Pb sources in PM2.5 in Nanchang. Combined, these sources contributed an average of 72.51% of the Pb measured, while vehicle exhaust accounted for 27.49% of Pb based on results from a binary Pb isotope mixed model,
