ASTM D8545-23
Standard Test Method for Determination of the Metal Deactivator Additive (MDA) (N,N′-disalicylidene-1,2-propanediamine) Content in Aviation Turbine Fuel by High Performance Liquid Chromatography (HPLC)

Standard No.

ASTM D8545-23

Release Date

2024

Published By

American Society for Testing and Materials (ASTM)  US  /  ASTM

Status

Be replaced

Replace By

ASTM D8545-23e1

Latest

ASTM D8545-25a

Introduction

Standard Technical Background and Evolution

ASTM D8545-23 is the first standard method specifically for the determination of the metal deactivator N,N'-disalicylidene-1,2-propylenediamine (MDA) in aviation turbine fuel. This standard was developed in response to the aviation industry's stringent fuel stability requirements. Trace metals (particularly copper) can catalyze fuel oxidation reactions, and MDA effectively chelates these metal ions. The method adopts high performance liquid chromatography technology, and its technological evolution is reflected in:

Technology version	Innovation	Application scenario
Procedure A	Capillary HPLC system (inner diameter ≤1mm)	Field/laboratory semi-portable detection
Procedure B	Conventional HPLC system (inner diameter >1mm)	Laboratory fixed equipment detection

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Method principle and key parameters

Based on the polarity separation principle, the fuel sample was filtered through a 0.2 μm filter membrane and injected into the HPLC system. The peak area of uncomplexed MDA was measured under a 315 nm UV detector. Core parameters include:

Comparison of Typical Operating Conditions

Parameters	Procedure A	Procedure B
Chromatographic column	GL Sciences Inertsil Diol (50×0.3mm)	GL Sciences InertSustain Cyano (100×3.0mm)
Flow rate	6μL/min	0.3mL/min
Injection volume	2μL	10μL
Column temperature	55℃	45℃

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Quality control requirements

The standard emphasizes quality control throughout the entire process. Critical control points include:

• Calibration verification: The recovery of the 5.7mg/L check standard must be within the range of 95-105%.
• System suitability: Peak asymmetry factor (As) <1.5, signal-to-noise ratio (S/N) > 10.
• Residual control: MDA content in blank sample <0.1mg/L.
• Linearity verification: Calibration curve r² ≥ 0.997, intercept/slope ≤ 0.25.

Interim precision data (single laboratory)

0.129

9.6-10.0	0.271	0.129

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Implementation Suggestions

Optimization suggestions for different application scenarios:

1. Rapid on-site testing: Procedure A is preferred. Note:
   • Use PTFE containers to avoid MDA adsorption
   • Insert a blank test after every 5 samples
2. Routine laboratory analysis: When using Procedure B, it is recommended:
   • Add 1% PMDETA in ethanol as a rinse solution
   • Use NIST-traceable reference materials

Note: The standard clearly states that a multi-laboratory joint study will be completed by 2028 to determine the final precision data.

ASTM D8545-23 history

• 2025 ASTM D8545-25a Standard Test Method for Determination of the Metal Deactivator Additive (MDA) (N,N′-disalicylidene-1,2-propanediamine) Content in Aviation Turbine Fuel by High Performance Liquid Chromatography (HPLC
• 2025 ASTM D8545-25 Standard Test Method for Determination of the Metal Deactivator Additive (MDA) (N,N′-disalicylidene-1,2-propanediamine) Content in Aviation Turbine Fuel by High Performance Liquid Chromatography (HPLC
• 2023 ASTM D8545-23e1 Standard Test Method for Determination of the Metal Deactivator Additive (MDA) (N,N′-disalicylidene-1,2-propanediamine) Content in Aviation Turbine Fuel by High Performance Liquid Chromatography (HPLC
• 2024 ASTM D8545-23 Standard Test Method for Determination of the Metal Deactivator Additive (MDA) (N,N′-disalicylidene-1,2-propanediamine) Content in Aviation Turbine Fuel by High Performance Liquid Chromatography (HPLC)

Standard and Specification