火焰光度檢測(cè)器(FPD)是一種高靈敏度高選擇性的測(cè)定硫磷化物的氣相色譜檢測(cè)器。但是FPD測(cè)硫時(shí)的選擇性并不好,在測(cè)低濃度硫化物時(shí)靈敏度也不高,且線性較差。因此,當(dāng)試樣中含有大量烴類時(shí),必須用色譜柱把烴類與硫化物完全分離,此時(shí)的選擇性(S/C)為10~4,否則就會(huì)受到烴類的嚴(yán)重干擾,甚至信號(hào)完全消失。

滕州市浩瀚色譜儀器技術(shù)服務(wù)有限公司研發(fā)出GC790DFPD雙火焰光度檢測(cè)器，組分在上下火焰中同時(shí)燃燒，當(dāng)出溶劑峰時(shí)，下火焰可能熄滅，上火焰仍然燃燒，待溶劑峰過(guò)后，下火焰會(huì)自動(dòng)點(diǎn)燃。DFPD避免了SFPD易淬滅的缺點(diǎn)，還使硫的響應(yīng)值與硫原子流速平方成正比，而與化合物的分子結(jié)構(gòu)無(wú)關(guān)，但靈敏度稍低于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.