Page 137 - Basic Gas Chromatography

123 in and it was of the is While
and here, them. [26] consisted continued thermionic thermionic selectively of salt
available included of many of 1964 in it because has it As a as known a (FTD), shows FID vicinity the in cesium or occurs. ionization 10%lppm | | | { | | | | 10° 3 mg detectors. GC

commercially are that are them of few ranges linear the Giuffrida and ) (AFID detector salt. metal alkali been has it and detector thermionic the that found present is salt rubidium of bead a flame the >105 10-9 x (2 | ppm) jo2 ai ! l act | 10° 4 10:9 <—_—_—_-—> | 108 | Lio | SCAN | 106 10°9 vg ng

Characteristics 107g selective 10* detectors a of descriptions of comparison (NPD) Detector detector was invented by Karmen ionization of an bead a added changed also flame a etc. have others and metal alkali an configuration, where region the tco 10:11 0 | >104 10-8 3108 [12 eof? 108 Ptops 3 | FPO(S) i | PID eof) sot) _ 2/2 Ms “sim

ECD to to DETECTORS major the Brief a shows Phosphorous alkali flame which was has name (TID), detector (TSD), Karmen when present in heated | | ecD HID ! NPD | NPD | | | | | | 10°19 tg 7.15.
Detectors of Summary MDQ—10°° Response—very Linearity—10* Stability—fair listed 7.1 use. 7.15 this the as to its detector Basically, sensitivity its In Fig.

Other 1. 2. 3. 4. OTHER Table common Figure Nitrogen When known FID an evolve, to ionization specific higher flame. electrically

Radioactive source /\ | Schematic 2. 2 5 of analysis
Cathode of ECD. an Sample Spiked Lindane pg 0.2 Heptachior pg 0.1 Aldrin pg 0.1 Ld 6 (min) 4 t insecticides ECD. by

\ V//WVA | Inlet Gas 7.13. (min) Femtogram

Fig.

Blank Benzene 246 t 7.14,

1. ——L 0 Fig.

122