Case Study

Sulfur Determination in the Analysis of Biomass

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
5E-IRS3600 Automatic Infrared Sulfur Analyzer

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