The resin from Shulan brown coal is separated by column chromatography repeatedly, then the eluant is ana-lyzed by gas chromatography-mass spectrometery. The result indicates that the distribution of main compounds am...The resin from Shulan brown coal is separated by column chromatography repeatedly, then the eluant is ana-lyzed by gas chromatography-mass spectrometery. The result indicates that the distribution of main compounds among the four fractions is different. D:A-Friedolean-7-ene, Simoneillite, C 25 A,B,C,D Ring-tetraaromatic-ursane and Retene are the main compounds in the four different fractions, respectively. The formation of some compounds and utilization of the resin were discussed.展开更多
采用四苯硼钠电位滴定法测定阳离子褐煤树脂的阳离子度。通过消除测定方法的离子干扰、优化四苯硼钠电位滴定法的测定条件来提高测定方法的准确度。采用5%盐酸溶液提取阳离子腐植酸,去除钾离子和其他水溶性杂质;四苯硼钠电位滴定过程中...采用四苯硼钠电位滴定法测定阳离子褐煤树脂的阳离子度。通过消除测定方法的离子干扰、优化四苯硼钠电位滴定法的测定条件来提高测定方法的准确度。采用5%盐酸溶液提取阳离子腐植酸,去除钾离子和其他水溶性杂质;四苯硼钠电位滴定过程中,提纯后阳离子腐植酸加入量为0.5 g,用0.2%氢氧化钠溶液溶解阳离子腐植酸,在p H 10.0条件下,选用甘汞电极为参比电极,氟硼酸根离子选择性电极为指示电极,用十六烷基三甲基溴化铵标准溶液电位滴定四苯硼钠,电位突变约200~300 m V,加标回收率达95%,满足分析测试的要求。实验结果表明,该方法选择性好、准确性高、易于操作,具有较高的推广应用价值。展开更多
文摘The resin from Shulan brown coal is separated by column chromatography repeatedly, then the eluant is ana-lyzed by gas chromatography-mass spectrometery. The result indicates that the distribution of main compounds among the four fractions is different. D:A-Friedolean-7-ene, Simoneillite, C 25 A,B,C,D Ring-tetraaromatic-ursane and Retene are the main compounds in the four different fractions, respectively. The formation of some compounds and utilization of the resin were discussed.
文摘采用四苯硼钠电位滴定法测定阳离子褐煤树脂的阳离子度。通过消除测定方法的离子干扰、优化四苯硼钠电位滴定法的测定条件来提高测定方法的准确度。采用5%盐酸溶液提取阳离子腐植酸,去除钾离子和其他水溶性杂质;四苯硼钠电位滴定过程中,提纯后阳离子腐植酸加入量为0.5 g,用0.2%氢氧化钠溶液溶解阳离子腐植酸,在p H 10.0条件下,选用甘汞电极为参比电极,氟硼酸根离子选择性电极为指示电极,用十六烷基三甲基溴化铵标准溶液电位滴定四苯硼钠,电位突变约200~300 m V,加标回收率达95%,满足分析测试的要求。实验结果表明,该方法选择性好、准确性高、易于操作,具有较高的推广应用价值。