Sample Preparation
Crush & Grind the sample to size ≤ 1mm, then insert the sample into furnace under 815℃ to burn completely ,then grind the ash to the size ≤ 0.1mm
Instrument Settings Combustion chamber temp. :1350℃
Constant Oven: 48 ±1℃
Oxygen: Purity 99.5%
Pressure: (0.25 ± 0.01) MPa
Oxygen Flow (4.0 ± 0.2) L/min
Air Extracting Pump: 2.5L/min
Nominal Sample Weight: 100mg
Analysis Time: 120s
Available Model: IRS II & IRS3600
Special Modifications to Unit
None
Procedure
1. Prepare instrument as outlined in the operator’s instruction manual (Routine check for temp. stability, gas leak test, etc.)
2. Purge the gas system for 10mins
3. (1-2) waste samples to condition the instrument
4. Run analysis for 1-2 standards sample for verifying the accuracy
5. Test 10-15 samples
6. 1-2 samples of calibration substance for verification (do drift correction if necessary)
7. Repetition of point 5 to point 6 until all samples are processed
Note
As sulfur content in biomass is very low, so need to calibrate the instrument with standard CRM which has extreme low sulfur percentage.
Typical Results
Sample No. | IR Method | Eschka Method |
St,d（%） | St,d（%） |
1 | 0.08 | 0.07 |
2 | 0.13 | 0.14 |
3 | 0.05 | 0.04 |
4 | 0.30 | 0.23 |
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