GB/T 16781.2-1997
Natural gas--Determination of mercury--Cold atomic fluorescent spectrophotometry (English Version)
- Standard No.
- GB/T 16781.2-1997
- Language
- Chinese, Available in English version
- Release Date
- 1997
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Status
- 2010-12
- Replace By
- GB/T 16781.2-2010
- Latest
- GB/T 16781.2-2010
- Scope
- This standard specifies A and B methods for the determination of mercury in natural gas (including elemental mercury, dimethylmercury and diethylmercury). Method A stipulates that samples are taken at atmospheric pressure, mercury is absorbed by potassium permanganate solution, mercury ions are then reduced, and then analyzed by cold atomic fluorescence mercury analyzer. Sampling for 2 hours, the detection limit is 0.3μg/m3. Aromatics can interfere. If aromatics are present, method B is recommended. Method B specifies sampling at atmospheric pressure or higher, adsorption of mercury by a gold wire, subsequent desorption, and analysis by cold atomic fluorescence mercury spectrometry. Sampling at atmospheric pressure for 2 hours, the detection limit is 0.03μg/m3. Method A is used for the determination of natural gas with high mercury content (>0.5μg/m3), method B is used for the determination of natural gas with low mercury concentration (10-3～1μg/m3 ) determination.
GB/T 16781.2-1997 history
- 2010 GB/T 16781.2-2010 Natural gas.Determination of mercury.Part 2:Sampling of mercury by amalgamation on gold/platinum alloy
- 1997 GB/T 16781.2-1997 Natural gas--Determination of mercury--Cold atomic fluorescent spectrophotometry
