Case Study

Fluorine Determination in the Analysis of Coal and Coke

Sample Preparation
Samples may be analyzed as air dried

Crush and grind to make the sample size ≤0.2mm

Instrument
5E-FL2350 Fluorine/Chlorine Analyzer

Instrument Settings
Oxygen : Flow 500ml/min; purity 99.5%      Vapour :2ml/min

Main Furnace Temperature:1100 ℃            Condensator  temp. :20℃
Calibration Standard: GBT4633-2014
Nominal Sample Mass: 100 mg
Analysis Time: 45 minutes/per test
 
Special Modifications to Unit
None

Method Approval

GBT4633-2014 and ISO11724 and ASTM D5987

Procedure

1. Prepare instrument as outlined in the operator’s instruction manual (check the solutions , pure water content and electrodes ,oxygen gas flow and etc.).
2. Do three blanks sample “Fkt” titration (initialize the titration system)
3. Combustion pretreatment with two empty crucibles (this process only for first time of using of each day)
4. weigh a portion(0.5g) of solid waste sample in crucible, then cover the sample with a flat layer of silica sand;
5. Load two crucibles with sample as prepared in step4 , then” start” analysis.
6. 2 samples of calibration substance to check the calibration after 10 duplicate sample analysis;
7. Repetition of point 4 to point 6 until all samples are processed;
 

Note
Do Calibrating refer to operator’s instruction manual for details.

Typical Results

Code

Name

Mass(g)

F(μg/g)

Range

Average(μg/g)

1

Coal

0.5047

160

14

160

2

Coal

0.5032

158

3

Coal

0.5036

167

4

Coal

0.5076

154