DIN 51451:2024-03 - Testing of petroleum products and related products - Analysis by infrared spectrometry

Introduction

Analysis of the core content of the standard

DIN 51451:2024-03 standard replaces the 2020 version. The main updates include:

Optimizing the selection of liquid cuvettes to adapt to modern technology
Clarifying the minimum performance requirements of FT-IR equipment (resolution ≥4 cm^-1)
Adding detailed specifications for ATR technology

Components	Technical requirements	Typical materials
IR spectrometer	Wavenumber accuracy±1 cm^-1, detection range4000-600 cm^-1	Fourier transform (FT-IR)
ATR crystal	Refractive index＞sample, multiple reflection design	ZnSe/Ge/Diamond
Cuvette windows	Transmittance＞98%, thickness tolerance±0.001mm	NaCl/CaF₂/BaF₂

Liquid Cell Method: Suitable for volatile samples, requiring precise control of optical path length
ATR Method: No sample preparation required, suitable for high viscosity/solid samples
Suspension Method: Use paraffin oil medium to avoid solvent interference
KBr Pellet Method: Only for limited analysis, requiring 20MPa pressure

Note: Halogenated solvents have been restricted due to environmental protection requirements

Method	Applicable scenarios	Precision control
Baseline method	Single component analysis	Need to correct Equipment factor F
Standard curve method	Multi-level calibration	R²≥0.995
Standard addition method	Low content detection	Spike amount 0.3-0.7A

Typical application case: Detection of lubricating oil oxidation products by carbonyl peak at 1740cm^-1

DIN 12880 Electrical laboratory devices - Heating ovens and incubators
DIN EN ISO 4259-1 Petroleum and related products - Precision of measurement methods and results - Part 1: Determination of precision data in relation to methods of test (ISO/DIS 4259-1:2025); German and English version prEN ISO 4259-1:2025*， 2025-05-01 Update

2024 DIN 51451:2024-03 Testing of petroleum products and related products - Analysis by infrared spectrometry - General working principles
2024 DIN 51451:2024 Testing of petroleum products and related products - Analysis by infrared spectrometry - General working principles
2023 DIN 51451:2023-10 Testing of petroleum products and related products - Analysis by infrared spectrometry - General working principles / Note: Date of issue 2023-08-25*Intended as replacement for DIN 51451 (2020-02).
2020 DIN 51451:2020-02 Testing of petroleum products and related products - Analysis by infrared spectrometry - General working principles
2020 DIN 51451:2020 Testing of petroleum products and related products - Analysis by infrared spectrometry - General working principles
2019 DIN 51451 E:2019-03 Testing of petroleum products and related products - Analysis by infrared spectrometry - General working principles
2019 DIN 51451 E:2019 Draft Document - Testing of petroleum products and related products - Analysis by infrared spectrometry - General working principles
2004 DIN 51451:2004-09 Testing of petroleum products and related products - Analysis by infrared spectrometry - General working principles
2004 DIN 51451:2004 Testing of petroleum products and related products - Analysis by infrared spectrometry - General working principles
1970 DIN 51451:1970 Testing of petroleum products and related products - Analysis by infrared spectrometry - General working principles