Methanesulphonate was investigated as a potential contributor to the sulphur budget based on the analysis on Antarctic snow/ice from Coffins Ice Cap, King George Island (62°10’ S, 58°50,W). The anion was fo...Methanesulphonate was investigated as a potential contributor to the sulphur budget based on the analysis on Antarctic snow/ice from Coffins Ice Cap, King George Island (62°10’ S, 58°50,W). The anion was found to be present at a mean concentration of 0. 17 μeq. L-1 with a maximum of 0.73 μeq. L-1. A distinct seasonal variation exists in the top 10 m of the core, equivalent to more than two years of deposition. Dating resulted from δ18O profile suggests that the principal peaks of methanesulphonate are associated with snow deposited in autumn and secondary peaks in spring. The seasonal patterns of methanesulphonate in the subantarctic snow displays a phase difference from that observed in marine air from low and middle latitudes.展开更多
运用离子色谱对2009年冬季中国东海大气气溶胶中水溶性离子Cl-、NO3-、SO42-、CH3SO3-(MSA)、Na+、K+、NH 4+、Mg2+、Ca2+进行了测定,同时由SPSS(statistical package for social sciences)软件进行相关性分析探讨其来源.分析结果表明,...运用离子色谱对2009年冬季中国东海大气气溶胶中水溶性离子Cl-、NO3-、SO42-、CH3SO3-(MSA)、Na+、K+、NH 4+、Mg2+、Ca2+进行了测定,同时由SPSS(statistical package for social sciences)软件进行相关性分析探讨其来源.分析结果表明,气溶胶中二次离子(非海盐硫酸盐nss-SO42-、NO3-、NH 4+)浓度最高,占总测定离子的78.4%.阴阳离子当量浓度平衡表明气溶胶中酸性离子中和不充分,NH 4+在不同化合物中的计量比表明NH4HSO4是气溶胶中NH 4+与SO24-的主要结合形式.气溶胶中甲基磺酸(MSA)的浓度较低,平均值为(0.008 8±0.003 7)μg.m-3.通过计算发现海盐硫酸盐对总硫酸盐的贡献为4.5%,生源硫酸盐对非海盐硫酸盐(nss-SO42-)的贡献为1.4%,表明人为输入是中国东海大气气溶胶中硫酸盐的主要来源.另外,气溶胶中nss-SO42-/NO 3-为1.08,反映了近年来中国能源结构调整的效果.展开更多
文摘Methanesulphonate was investigated as a potential contributor to the sulphur budget based on the analysis on Antarctic snow/ice from Coffins Ice Cap, King George Island (62°10’ S, 58°50,W). The anion was found to be present at a mean concentration of 0. 17 μeq. L-1 with a maximum of 0.73 μeq. L-1. A distinct seasonal variation exists in the top 10 m of the core, equivalent to more than two years of deposition. Dating resulted from δ18O profile suggests that the principal peaks of methanesulphonate are associated with snow deposited in autumn and secondary peaks in spring. The seasonal patterns of methanesulphonate in the subantarctic snow displays a phase difference from that observed in marine air from low and middle latitudes.
