FETV-ICP-AES直接测定高纯二氧化硅中痕量钛

FETV-ICP-AES直接测定高纯二氧化硅中痕量钛 PREPARATION AND DRUG DELIVERY CHARACTERIZATION OF NETTED LIPOSOMES 彭天右 Zhang Jie 1 first-author 秦永超 Liu Zhenhua 1 刘怀志 Fan Changlie 1 江祖成 Zhen Pengqian 1 武汉大学化学系 武汉大学化学系 Department of Chemistry, Wuhan University, Wuhan 430072,China) \ \ Department of Chemistry, Wuhan University, Wuhan 430072,China) \ \ 以聚四氟乙烯（ＰＴＦＥ）悬浮液为氟化剂，氟化电热蒸发／（ＦＥＴＶ）－ＩＣＰ－ＡＥＳ直接分析粉末二氧化硅．在优化实验条件下，基体Ｓｉ及痕量Ｔｉ均转化为氟化物，并以氟化物形式蒸发．结果表明：高达２０ｇ·Ｌ－１的Ｓｉ对Ｔｉ的分析信号的干扰可以忽略不计；ＳｉＯ２的粒度高达１５４μｍ时，相对蒸发率仍接近１００％，对悬浮体和溶液中基体及待测元素的蒸发特性进行了比较研究，并对石墨炉内发生的热化学反应进行了初步的探索． The netted liposomes were prepared, utilizing dialkylphosphates as membrane materials and polyquaternary ammonium compound as covering materials. All netted liposomes could form large unilamellar liposomes which were detected by polarizied optical microscope. Their diameters are 2￣7 μm. Encapsulation efficiency and during release rate were also studied. PTFE悬浮体 氟化电热蒸发 高纯SiO2 电感耦合等离子体光谱 O657.31 国家自然科学基金,国家教委博士点基金 1997-04-01 2021-04-01 4