florius回复于2012/03/08
首先楼主检查一下进样有没问题,是否没进到样;我们做这个用的标准溶液最低浓度是20ppb,也是不分流脉冲,升温程序也差不多,最高到310,保持5分钟,建议配一个高浓度的标液,先用SCAN扫描定性,你这么小浓度用SIM扫描可能会信号小,用SCAN可能峰都埋在基线里了
holmes8519回复于2012/03/10
我的条件:使用HP-5MS柱子做PAHs分析,柱温条件:80℃为0.5min,5℃/min到230℃,5℃/min到300℃,保持15min,进样量1μL,无分流,每种PAHs的浓度约为0.64μg/ml。
SIM条件:5min时,m/z扫描102,128,129;
12min时,m/z扫描151,152,153,154,162,164;
16.5min时,m/z扫描165,166,167;
20min时,m/z扫描152,176,178,188,189;
25min时,m/z扫描101,202,203;
29.1min时,m/z扫描215,216,217;
31.8min时,m/z扫描189,225,226,227,228,229,234,235;
36min时,m/z扫描126,252,253,264,265;
42min时,m/z扫描138,276,277,278,288,289;
(该方法参考文献:Analysis of 27 polycyclic aromatic hydrocarbons by matrix solid-phase dispersion and isotope dilution gas chromatography-mass spectrometry in sewage sludge from the Spanish area of Madrid. Journal of Chromatography A, 2007)http://bbs.instrument.com.cn/shtml/20120108/3789078/