GB/T 17674-2021 in English
VALIDDetermination of nitrogen in crude oil―Boat-inlet chemiluminescence
- Issued on:2021-12-31
- Implemented on:2022-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 17674-2021原油中氮含量的测定 舟进样化学发光法》由TC355（全国石油天然气标准化技术委员会）归口，TC355SC10（全国石油天然气标准化技术委员会油气计量及分析方法分会）执行，主管部门为国家标准化管理委员会。
Introduction
Core changes in the standard revision
| Technical elements | 2012 edition | 2021 edition | Significance of the revision |
|---|---|---|---|
| Unit specification | Mixed use mass fraction/concentration | Unified as mg/kg | Improve data comparability |
| Preparation of standard solution | Volume method only | Add mass method | Improve accuracy |
| Calculation formula | 4 formulas | 8 formulas | Covering more application scenarios |
Key instrument configuration requirements
Boat injection system must meet the following requirements:
- Sample boat material: platinum or quartz, lined with quartz wool
- Injection speed controllable range: 150±10mm/min
- Sealing requirements: able to withstand high temperature of 1100℃
Combustion tube configuration differences:
- Single-stage furnace temperature 1100℃±25℃
- Dual-stage needs to have carrier gas/oxygen switching function
Analysis of key operation points
Establishing a standard curve
Note when using a 5μL syringe for injection:
- The volume method requires three rinses to eliminate bubbles
- The weighing accuracy of the mass method must reach 0.01mg
Typical problem solving
| Phenomenon | Cause | Solution |
|---|---|---|
| Residual coke in the sample boat | Insufficient residence time | Extend the time in the high temperature zone by ≥2min |
| Carbon deposition at the end of the combustion tube | Injection speed is too fast | Adjust to 150±10mm/min |
Quality Control Implementation Plan
QC sample selection should meet the following requirements:
- Nitrogen content covers the range of 40-10000mg/kg
- National primary standard materials should be used preferentially
- The analysis interval for each batch shall not exceed 20 samples
Precision control requirements:
Repeatability: r ≤ 0.087X (X is the mean)
Reproducibility: R ≤ 0.266X (X is the mean)
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