Figure 5.

Infrared absorption spectra of various substances.

Notes: The absorption peaks of the NH₄HCO₃ solution were at ~1,300 nm, of the ammonia solution at ~1,100 nm, of dd H₂O at ~720 nm, and of CO₂ at ~700 nm. (A) NH₄HCO₃ solution. (B) dd H₂O. (C) CO₂. (D) Ammonia solution. ‘A’ means absorption peak.

Abbreviations: dd H₂O, double-distilled H₂O; NH₄HCO₃, ammonium bicarbonate.