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BS EN 15705:2023

BS EN 15705:2023

$102.76

Inorganic fertilizers. Determination of methylen-urea oligomers using high-performance liquid chromatography (HPLC)

Published By Publication Date Number of Pages
BSI 2023 20
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This document specifies a method for the determination of methylen-urea (MU) oligomers in inorganic fertilizers using high-performance liquid chromatography (HPLC). The method is applicable to all fertilizers which do not contain interfering organic compounds. NOTE By the condensation of urea and formaldehyde, several oligomers are formed, such as methylen-diurea (MDU), dimethylen-triurea (DMTU), trimethylen-tetraurea (TMTU) and higher oligomers. The three molecules named here are the most soluble in water, while the higher compounds are insoluble in hot water, but their nitrogen is available for plants by microbiological decomposition. Also, urea is always a companion of MU-oligomers.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
7 6 Apparatus and equipment
7 Sampling and sample preparation
8 Procedure
8.1 Calibration
8.1.1 Stock solution of urea, mass concentration ρ ≈ 1 000 mg/kg
8 8.1.2 Stock solution of methylen-diurea, ρ ≈ 1 000 mg/kg
8.1.3 Stock solution of dimethylen-triurea, ρ ≈ 1 000 mg/kg
8.1.4 Stock solution of trimethylen-tetraurea, ρ ≈ 100 mg/kg
8.1.5 Calibration solutions
9 8.2 Preparation of the test solution
8.3 Measurement
9 Calculations and expression of the result
11 10 Precision
10.1 Inter-laboratory tests
10.2 Repeatability
10.3 Reproducibility
12 11 Test report
13 Annex A (informative)Results of the inter-laboratory tests
14 Annex B (informative)Example chromatogram and calibration curves
B.1 Example chromatogram
15 B.2 Example calibration curves
17 Annex C (informative)Example conditions for a suitable HPLC system

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BS EN 15705:2023
$102.76