1 Scope
1.1 This standard is applicable to the determination of nitrogen in liquid hydrocarbons, including petroleum fractions and lubricating oils in the concentration range from 40mg/kg~10,000mg/kg. For light hydrocarbons containing less than 100mg/kg nitrogen, SH/T 0657 can be more appropriate.
1.2 The values stated in SI units are to be regarded as standard.
1.3 The use of this standard may involve certain hazardous materials, operations and equipment, but it does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 4756 Petroleum liquids - Manual sampling (GB/T 4756-1998, eqv ISO 3170:1988)
SH/T 0657 Standard test method for trace nitrogen in liquid petroleum hydrocarbons by syringe/inlet oxidative combustion and chemiluminescence detection
SY/T 531 Petroleum liquids - Automatic pipeline sampling (SY/T 5317-2006, ISO 3171:1988, IDT)
3 Summary of test method
A hydrocarbon sample is placed on a sample boat at room temperature. The sample and boat are advanced into a high-temperature combustion tube by the drive mechanism where the nitrogen is oxidized to nitric oxide (NO) in an oxygen atmosphere. The NO contacts ozone and is converted to excited nitrogen dioxide (NO2). The light emitted as the excited NO2 decays is detected by a photomultiplier tube, and the resulting signal is a measure of the nitrogen contained in the sample.
Foreword I
1 Scope
2 Normative references
3 Summary of test method
4 Significance and use
5 Apparatus
6 Reagents and materials
7 Sampling
8 Preparation of apparatus
9 Calibration and standardization
10 Quality control
11 Procedure
12 Calculation
13 Report
14 Precision and bias
15 Keywords
Annex A (Informative) Quality control (QC) monitoring
Bibliography
