DFPD双火焰光度检测器

 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。

滕州市浩瀚色谱仪器技术服务有限公司研发出GC790DFPD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。

Flame Photometric Detector (FPD) is a high sensitivity and high selectivity gas chromatographic detector for the determination of sulfur phosphide. However, the selectivity of FPD is not good, the sensitivity is not high when the concentration of sulfide is measured, and the linearity is poor. Therefore, when the sample contains a large number of hydrocarbons, you must use the column to completely separate the hydrocarbons and sulfides, the selectivity (S / C) of 10 to 4, otherwise it will be severely interfered by hydrocarbons, Even the signal completely disappeared.

        Tengzhou City, the vast spectrum of instruments Technical Services Limited developed GC790DFPD dual flame photometric detector, the components in the upper and lower flame at the same time burning, when the solvent peak, the flame may be extinguished, the flame is still burning until the solvent peak after the flame Will automatically ignite. DFPD avoids the disadvantage of SFPD being easily quenched, and the sulfur response is proportional to the square of the flow rate of the sulfur atom, independent of the molecular structure of the compound, but somewhat less sensitive than the SFPD.