原文由 阿宝(lpr20) 发表:原文由 yanyan10(yanyan10) 发表:
如果是你说的那样,完全不分流进样!为何还要设分流比呢?After that, the gas flow rate became split with a 25:1 flow ratio for the remaining run time.
关于这个问题我请教过岛津的工程师,我说既然进样都完成了干嘛还要打开分流?这不是浪费载气吗?毕竟分流流量比较大。工程师说打开分流是为了快速吹出衬管中的残留的溶剂、样品,避免峰脱尾。
原文由 yanyan10(yanyan10) 发表:原文由 阿宝(lpr20) 发表:原文由 yanyan10(yanyan10) 发表:
如果是你说的那样,完全不分流进样!为何还要设分流比呢?After that, the gas flow rate became split with a 25:1 flow ratio for the remaining run time.
关于这个问题我请教过岛津的工程师,我说既然进样都完成了干嘛还要打开分流?这不是浪费载气吗?毕竟分流流量比较大。工程师说打开分流是为了快速吹出衬管中的残留的溶剂、样品,避免峰脱尾。
谢谢您了!有很多问题都是您帮助解决的!真的非常感谢!这个论坛是我读研究生以来最大的收获。呵呵。。。。大学时整日上网也没接触过这么好的学习论坛!再次感谢所有帮助过我的朋友,前辈!
原文由 yanyan10(yanyan10) 发表:
前辈们好!SPME进样,气相测定MTBE的文献中,有这样一种进样模式。我查了很多资料,猜想大概应该是不完全分流模式吧?文献中讲述的,我不太懂。希望做过的前辈,给我指导一下!多谢了!文献如下:
The injection port of the gas chromatographic instrument had a splitless flow into the column for 1 min to ensure that the desorbed species were trapped at the beginning of the column. After that, the gas flow rate became split with a 25:1 flow ratio for the remaining run time. The reactant and products were separated with a 30 m by 0.25 mm Phenomenex ZB-624 column, designed to separate volatile organic compounds.TwoGCoven temperature control methods were used to analyze the compounds. The first method used an initial oven temperature of 0 °C, which was held at this temperature for 5 min, and then ramped at a rate of 10 °C/ min to 100 °C. The oven temperature was then ramped at 50 °C/min to a final temperature of 225 °C.
原文由 hfang2005(hfang2005) 发表:
不分流进样一分钟之后,分流的目的不是减小柱流速,而是加大载气进入进样口玻璃衬管的总流量, 快速地将衬管内剩余的样品从分流口吹扫出去,从而减少拖尾,改善峰型,和增加分辨率.