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Environmental

Carbon Hydrogen Nitrogen Determination in Solid Waste

Sample Preparation
Samples may be analyzed as air-dried.
Sample size ≤1mm

Instrument
5E-CHN2200 Elemental Analyzer

Instrument Settings
Oxygen Flow(SV4): 3L/min;
Oxygen Flow(SV5): 0.8L/min;
Oxygen Flow(SV6): 0.3L/min
Main Furnace Temperature: 950 ℃;
Secondly Furnace Temperature: 850 ℃
Calibration Standard: UNI CEN/TS15407
Nominal Sample Weight: 80 mg
Analysis Time: 6 minutes per analysis

Special Modifications to Unit
None

Method Approval
UNI CEN/TS15407

Procedure
1. Prepare instrument as outlined in the operator’s instruction manual (perform maintenance and leak checks, etc.).
2. Purging and analyze blanks until instrument is stable (nitrogen results will reach a plateau),
3. Calibrate by CRM EDTA
4. (4-5) blanks and (1-2) waste samples to condition the instrument
5. 3 samples of calibration substance to check or carry out the calibration;
6. Run 9 sample analyses
7. 2 samples of calibration substance to check the calibration;
8. Repetition of point 5 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) Cad(%) Had(%) Nad(%)
1 Solid waste 3 0.0601 67.98 8.27 0.80
2 Solid waste 3 0.0816 52.93 8.04 1.09
3 Solid waste 3 0.0797 67.43 8.03 0.89
4 Solid waste 3 0.0803 52.54 7.96 1.03

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