Instant Notes: Analytical Chemistry

break down in several stages over the temperature range 100 to 600°C and the

evolution of water, formaldehyde and ammonia and, at higher temperatures

phenol, can be detected by mass spectrometry, showing the course of the

decomposition.

322 Section G – Thermal methods

100

50

0

0 200 400 600

Mass %

pH

5

1

Temperature (°C)

Fig. 2. Evolution of HCl gas from poly(vinyl chloride) detected by pH measurement (- - -)

during TG (–––).