2016GC7990plusDFPD双火焰光度检测器

            Flame photometric detector (FPD) is a highly sensitive and selective determination of sulfur phosphide gas chromatographic detector. But the selectivity of FPD is not good, and the sensitivity is not high, and the linearity is poor. Therefore, when the sample contains a large number of hydrocarbons, it is necessary to use the column to complete separation of hydrocarbons and sulfur compounds, at this time the selectivity (S/C) for 10~4, otherwise it will be subject to serious interference of hydrocarbons, and even the signal completely disappeared.

        火焰光度检测器(FPD)是一种高灵敏度高选择性的测定硫磷化物的气相色谱检测器。但是FPD测硫时的选择性并不好,在测低浓度硫化物时灵敏度也不高,且线性较差。因此,当试样中含有大量烃类时,必须用色谱柱把烃类与硫化物完全分离,此时的选择性(S/C)为10~4,否则就会受到烃类的严重干扰,甚至信号完全消失。

       滕州市翔鹰分析技术有限公司研发出GC7990DFPD双火焰光度检测器，组分在上下火焰中同时燃烧，当出溶剂峰时，下火焰可能熄灭，上火焰仍然燃烧，待溶剂峰过后，下火焰会自动点燃。DFPD避免了SFPD易淬灭的缺点，还使硫的响应值与硫原子流速平方成正比，而与化合物的分子结构无关，但灵敏度稍低于SFPD。