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Alternative Fuel

Mercury Determination for Biomass

Sample Preparation
Boats should be pre-baked at 550°C for an hour or analyzed (without a sample) before loading a
sample
Samples may be analyzed as air dried

Crush and grind to make the sample size ≤0.2mm

Instrument
5E-HGT2320 Automatic Mercury Analyzer

Instrument Settings

Oxygen :Flow 300ml/min; purity ≥99.9%    Pressure :0.1 Mpa

Main Furnace

Drying Temp.:300℃                      Time:90s

Combustion Temp.:800℃           Time:180s

Catalyst Furnace Temp.:600℃

Purge Time: 60s

Nominal Sample Mass: 50mg~70mg

Analysis Time: 6minutes/per test


Calibration standard

Standard Mercury Solution or equivalent Certified Reference Materials.


Method Approval

GB 16659-2008 / ASTM D6722-11


Procedure

1. Prepare instrument as outlined in the operator’s instruction manual ; (check the Inlet pressure、Outlet2 pressure、Furnace temperature、Catalytic tube temperature and Voltage.)

2. Keep the instrument in “prepare” state for at least half an hour;

3. Do three blank samples test to reduce the blank level; (if the blank LC_peak is higher than 0.001, more blank sample is suggested)

4. Weigh one standard sample (60mg) in nickel boat, input the sample weight information in the software, press the “start” button to do test; (Make sure the sample position is correspond to crucible No. in the software)

5. If the standard sample is in the tolerated content range, go to step 6, or you should do two more stand sample test. If the two standard sample is still not in the tolerated content range, you need to built a new calibration curve.

6. weigh two biomass sample (60mg) in nickel boat, input the sample weight information in the software, press the “start” button to do test; (Make sure the sample position is correspond to crucible No. in the software)

7. One standard sample to check the calibration after 10 duplicate sample analysis;

8. Repetition of point 6 to point 8 until all samples are processed;


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

Typical Results
Code Name Mass(g) Hg(μg/g) Average(μg/g)
1 Wood 0.0607 0.0057 0.0052
2 Wood 0.0610 0.0049
3 Wood 0.0603 0.0049
4 Wood 0.0595 0.0053

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