Effect of ammonia on the response of the electron capture detector (ECD)

✍ Scribed by Abdel-Rehim, Mohamed ;Kamel, Mohamed ;Hassan, Moustapha

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 309 KB
• Volume: 18
• Category: Article
• ISSN: 0935-6304
• DOI: 10.1002/jhrc.1240181206

✦ Synopsis

Abstract

The effect of ammonia on the electron capture detector (ECD) response has been investigated. Nitrogen with different ammonia concentrations (5–20%) was used as make‐up gas. Compared to pure nitrogen, the ECD response decreased when the ammonia concentration in the make‐up gas was 5%. However, the response increased when the ammonia concentration was 20%. The response factor of 4‐chlorophenol increased 4 fold when ammonia was 20%. Also, di‐ and tri‐chlorophenols increased by 30–50%. The nitroaromatic compounds responses increased by about 2–3.7 times with 20% ammonia in the make‐up gas. The signal‐to‐noise (S/N) increased when 20% ammonia in nitrogen was used as make‐up gas compared to pure nitrogen. Also, the detector linearity increased by 50% with ammonia.