NB/SH/T 0162-2021 Determination of basic nitrogen content in petroleum distillates — Color indicator method

AI-translated method card — human verification pending. This is not an official translation of the standard. Unclear source values remain unverified; check the original standard and product certificate before use.

Card type: Test method

1. Method number / full title / English name / replacement relationship

• Standard number: NB/SH/T 0162—2021
• Chinese full title: Determination of basic nitrogen content in petroleum distillates — Color indicator method
• English name: Determination of basic nitrogen in petroleum distillates — Color Indicator titration method (the original English title has source-text extraction noise, requires confirmation against the source standard (source-text extraction))
• Replacement relationship: replaces SH/T 0162—1992 "Determination of basic nitrogen in petroleum products" (the original text here has source-text extraction noise, requires confirmation against the source standard (source-text extraction))
• Previous versions: first published in 1986 as ZBE30003-86; in 1992 the standard number was changed to SH/T 0162-1992; this document is the first revision
• Publication/implementation: published on 2021-11-16, implemented on 2022-05-16
• Custodianship: National Technical Committee for Standardization of Petroleum Products and Lubricants, Subcommittee on Petroleum Fuels and Lubricants (SAC/TC 280/SC1)
• Proposed by: China Petrochemical Corporation
• Drafting organizations: Sinopec Research Institute of Petroleum Processing, Lubricant Branch of PetroChina Company Limited
• Main drafters: Yang Mengzhi, Yu Bing, Nan Yugui, Wang Huan

2. Scope of application and non-applicability

• Applicable: specifies a method for determining basic nitrogen content in light-colored petroleum distillates by the color indicator method.
• Includes two test procedures, procedure A and procedure B:
  • Procedure A: applicable to light-colored petroleum distillates such as gasoline that can dissolve in glacial acetic acid.
  • Procedure B: applicable to light-colored petroleum distillates such as kerosene, diesel, and lubricant base oils that cannot dissolve in glacial acetic acid but can dissolve in a glacial acetic acid-xylene mixed solvent.
• Not applicable: not applicable to dark-colored petroleum distillates that may affect observation of the color indicator change; nor applicable to petroleum distillates containing additives that may affect the determination results.
• Differences from the 1992 edition: in the scope of application, "lubricating oil" was changed to "lubricant base oil" (see Chapter 1, Chapter 1 of the 1992 edition).

3. Method principle

Dissolve the sample in glacial acetic acid or a glacial acetic acid-xylene mixed solvent, use methyl violet or crystal violet as indicator, and titrate the basic nitrogen in the sample with a perchloric acid-glacial acetic acid standard solution until the solution changes from purple to blue. Calculate the basic nitrogen content in the sample based on the concentration and volume of the perchloric acid-glacial acetic acid standard solution consumed.

4. Reagents and materials (purity / preparation)

• Titration solvent:
  • Glacial acetic acid: applicable to procedure A.
  • Glacial acetic acid-xylene mixed solvent: applicable to procedure B.
  • Differences from the 1992 edition: the titration solvent was changed from "benzene-glacial acetic acid mixed solvent" to "glacial acetic acid or glacial acetic acid-xylene mixed solvent" (see Chapter 1, Chapter 4, clause 8.3 and Chapter 10, Chapter 2, clause 5.2 and Chapter 6 of the 1992 edition).
• Indicator: methyl violet or crystal violet.
• Titrant: perchloric acid-glacial acetic acid standard solution.
• Purity of other reagents and specific preparation methods: not provided in the available source (not provided in the main text of source-text extraction).

5. Instruments and equipment

Not provided in the available source (not provided in the main text of source-text extraction).

6. Recommended operating conditions

Not provided in the available source (not provided in the main text of source-text extraction).

7. Sampling and sample preparation

Not provided in the available source (not provided in the main text of source-text extraction; only Chapter 2 cites GB/T 4756 Standard practice for manual sampling of petroleum liquids and GB/T 27867 Standard practice for automatic sampling of petroleum liquids in pipelines).

8. Analytical procedure

• Divided into procedure A and procedure B, described separately (see Chapter 9 and Chapter 10; the chapter references are unclear in the source transcription and require verification).
• Procedure A: applicable to light-colored petroleum distillates such as gasoline that can dissolve in glacial acetic acid, using glacial acetic acid as the titration solvent.
• Procedure B: applicable to light-colored petroleum distillates such as kerosene, diesel, and lubricant base oils that cannot dissolve in glacial acetic acid but can dissolve in a glacial acetic acid-xylene mixed solvent, using the glacial acetic acid-xylene mixed solvent as the titration solvent.
• Specific operating details: not provided in the available source (not provided in the main text of source-text extraction).

9. Qualitative and quantitative determination and calculation formula

• Titration endpoint: the solution changes from purple to blue.
• Calculation basis: calculate the basic nitrogen content in the sample based on the concentration and volume of the perchloric acid-glacial acetic acid standard solution consumed.
• Specific calculation formula: not provided in the available source (not provided in the main text of source-text extraction).

10. Precision

Not provided in the available source (not provided in the main text of source-text extraction).

11. Report

Not provided in the available source (not provided in the main text of source-text extraction).

12. Normative references

• GB/T 4756 Standard practice for manual sampling of petroleum liquids
• GB/T 6682—2008 Specifications and test methods for water for analytical laboratory use
• GB/T 27867 Standard practice for automatic sampling of petroleum liquids in pipelines
• GB/T 1.1—2020 Directives for standardization work — Part 1: Structure and drafting rules for standardization documents (cited in the foreword)

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick reference Q&A