Case Study

Calorific Value Determination in Liquid Food

Standard
GB/T 213, ASTM D5865
Sample Preparation

sample weight is less than 0.3g

Accessories
Benzoic acid with specified calorific value
99.5% pure oxygen (Note electrolytic oxygen is not allowed to be used)
Capsule

Instrument
5E-C5508 Automatic Calorimeter

Analysis Time
10-15min

Procedure 
1. Test the capsule to get its own calorific value
2. Take one capsule and get its weight
3. Weigh the sample to 0.3g (Note : sample must be in the capsule ,and seal the capsule after weighing)
4. Add the additive benzoic acid (around 0.5g) to the weighed sample
5. Condition the instrument as below
    a) Enter the analysis interface and preheat the instrument in advance for at least three times
    b) Do a waste sample after preheat
    c) Test a benzoic aced sample to check the instrument
6. After conditioning the instrument, feed the sample to the bomb
    Note :1. the ignition wire must touch the benzoic acid during feeding the sample to the bomb;
              2. For GB/T 213 standard ,filling 10mL distilled water into the bomb; for ASTIM D5865 standard, filling 1mL distilled water into the bomb
6.  Charging the bomb with oxygen under 3MPa
7.  Put the bomb into instrument, and input the sample weight to the software
8.  Input the weight and calorific value of two kinds of additive when click the “multi” button, then click “Calculate” and “Return”.

9. Click “Start” to analyze the sample

Typical Results

 
Sample NameSample Weight(g)Calorific Value   Qb(J/g)
Baby food0.24791697
0.29371725
Average Value1711