应用差示扫描量热法、红外光谱法、核磁共振波谱法和高效液相色谱法对β-谷甾醇与马来酸酐的酯化产物进行了表征和分析.实验结果表明:β-谷甾醇与马来酸酐发生酯化反应,产物为β-谷甾醇马来酸单酯;用Hypers il ODS反相柱,以甲醇为流动相...应用差示扫描量热法、红外光谱法、核磁共振波谱法和高效液相色谱法对β-谷甾醇与马来酸酐的酯化产物进行了表征和分析.实验结果表明:β-谷甾醇与马来酸酐发生酯化反应,产物为β-谷甾醇马来酸单酯;用Hypers il ODS反相柱,以甲醇为流动相,在检测波长为210 nm、柱温为25℃、流速为0.7 mL.m i-n 1的实验条件下进行液相色谱分析,β-谷甾醇及其马来酸单酯能够达到基线分离,采用外标法对β-谷甾醇及其马来酸单酯进行了定量分析,相对误差在±5%之间.外标法测得β-谷甾醇及其马来酸单酯的回收率接近100%.展开更多
X-ray diffaction analysis(XRDA)data of the black or brown patina on the surfaces of eight kinds of bronze mirror samples show 4 or 5 broad diffuse peaks which corresponding to almost the same 20 angle, while their mat...X-ray diffaction analysis(XRDA)data of the black or brown patina on the surfaces of eight kinds of bronze mirror samples show 4 or 5 broad diffuse peaks which corresponding to almost the same 20 angle, while their matixes does not.These results indicate that those diffuse peaks were produced by the SnO2, microcrystals of 3 ￣5 nm size contained in the black or brown patina.The matrix of unearthed black patina bronze mirror numbered 223, gives strong XRDA diffraction peaks, indicating that there are a large amounts of non-oxidized bronze alloy particles surrounded by SnO2,which shows that the black patinas are not wholly metallic oxides (mainly SnO2),there are also a lot of original alloys of different sizes in grain in the patina.The bright-field image of the black patina sample gives the same result.展开更多
文摘X-ray diffaction analysis(XRDA)data of the black or brown patina on the surfaces of eight kinds of bronze mirror samples show 4 or 5 broad diffuse peaks which corresponding to almost the same 20 angle, while their matixes does not.These results indicate that those diffuse peaks were produced by the SnO2, microcrystals of 3 ￣5 nm size contained in the black or brown patina.The matrix of unearthed black patina bronze mirror numbered 223, gives strong XRDA diffraction peaks, indicating that there are a large amounts of non-oxidized bronze alloy particles surrounded by SnO2,which shows that the black patinas are not wholly metallic oxides (mainly SnO2),there are also a lot of original alloys of different sizes in grain in the patina.The bright-field image of the black patina sample gives the same result.
