Navas Instruments thermogravimetric analyzers for quality control and research used in the analysis of organic and inorganic materials

Conclusions



Moisture and ash analysis can be performed on the same sample in 4 - 5 hours depending on sample size. Moisture within day standard deviation was consistently around 0.02. Between day moisture standard deviation was artificially high due to moisture loss during the three-week testing period. Within day standard deviation for ash was consistently less than 0.006 for both sample types and sizes. The 4.5g sample allows for ash values to have a standard deviation of approximately 0.005 over time compared to 0.007 for the 3g.

Sample Weight (g)

3.0

4.5

3.0

4.5

3.0

4.5

3.0

4.5

3.0

4.5

Moisture Avg

13.98

13.96

13.86

13.85

13.89

13.88

11.31

11.33

12.95

12.94

Between Day Std (n=9)

0.08

0.08

0.16

0.16

0.10

0.10

0.02

0.01

0.06

0.06

Within Day Std (n=3)

0.005

0.005

0.005

0.005

0.005

0.004

0.006

0.003

0.005

0.003

Mst Time (min)

60

77

60

77

60

77

60

77

60

77

Total Time (min)

243

302

243

302

243

303

243

303

243

302