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用电子探针技术开展单个含钾颗粒物的分析表征 .第一种方法用蒙特卡洛方法模拟电子束与样品复杂的相互作用 ,对于KCl晶粒取得的计算结果与理论值一致 .K/Cl比的均值为 0 996 ,标准偏差为 0 0 1 2 .由于晶形不规则和热稳定性差 ,K2 SO4 和KHSO4 的结果没有达到KCl的准确度 .其K/S比的均值和标准偏差分别为 1 90 5±0 0 1 3和 1 0 1 4± 0 0 72 .第二种方法用回归分析方法处理了同一种类若干数目的颗粒物分析数据 .直接用同种类标准颗粒物的分析结果校准 ,进行定量分析和化学形态识别 .研究结果表明 ,非洲草原大火燃烧排放时 ,含钾颗粒经历了逐步酸化的过程 .在排放时主要以KCl形态存在 ,少量是K2 SO4 和复盐 .在大气传输过程中逐渐酸化 ,主要转变成KHSO4 .少量停空时间长的颗粒则继续酸化 ,成为高度富硫的颗粒 .
Electron-probe technique was used to analyze and characterize the single K-bearing particles.The first method used the Monte Carlo method to simulate the complex interaction between electron beam and sample, and the calculated results for KCl were consistent with the theoretical values.The K / Cl ratio With a mean value of 0 996 and a standard deviation of 0 0 1 2. The K 2 SO 4 and KHSO 4 results did not reach the KCl accuracy due to irregular crystal shape and poor thermal stability.The mean and standard deviation of the K / S ratios were 1 90 5 ± 0 0 1 3 and 1 0 1 4 ± 0 0 72. The second method used the regression analysis method to deal with the same kind of number of particle analysis data.It was calibrated directly with the analysis results of the same kind of standard particles and analyzed quantitatively and Chemical morphological identification.The results show that the K-containing particles undergo gradual acidification process in the combustion of African grassland flames, mainly in the form of KCl when discharged, a small amount of K2SO4 and double salts, which gradually acidify during atmospheric transport, The main conversion to KHSO4. A small number of long-suspended particles continue to acidification, a highly sulfur-rich particles.