ISO 6181:2023
Fertilizers and soil conditioners — Liquid methylene-urea slow release fertilizers — General requirements
This document specifies general requirements, analytical methods, sampling and preparation of test sample, marking and labelling, packaging, transport and storage for liquid methylene-urea slow release fertilizers.
This document applies to pure liquid slow release fertilizers, i.e. methylene urea (MU).
This document does not apply to mixtures of nitrogenous fertilizers containing liquid slow release fertilizers.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 Visual inspection
4.2 Requirements of liquid methylene-urea slow release fertilizers
5 Analytical methods
5.1 Visual inspection for foreign matter
5.2 Determination of the mass fraction of total nitrogen
5.3 Determination of the mass fraction of ureic nitrogen
5.4 Determination of the mass fraction of methylene-urea reaction products nitrogen
5.5 Determination of the ammonia nitrogen
5.6 Determination of the nitric nitrogen
5.7 Determination of the cyanamide nitrogen
5.8 Determination of the biuret content
5.9 Determination of the mass fraction of water insoluble matter
5.10 Determination of the density
6 Sampling and preparation of test sample
6.1 Sampling method
6.2 Test sample preparation
7 Marking and labelling
8 Packaging, transport and storage
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 Visual inspection
4.2 Requirements of liquid methylene-urea slow release fertilizers
5 Analytical methods
5.1 Visual inspection for foreign matter
5.2 Determination of the mass fraction of total nitrogen
5.3 Determination of the mass fraction of ureic nitrogen
5.4 Determination of the mass fraction of methylene-urea reaction products nitrogen
5.5 Determination of the ammonia nitrogen
5.6 Determination of the nitric nitrogen
5.7 Determination of the cyanamide nitrogen
5.8 Determination of the biuret content
5.9 Determination of the mass fraction of water insoluble matter
5.10 Determination of the density
6 Sampling and preparation of test sample
6.1 Sampling method
6.2 Test sample preparation
7 Marking and labelling
8 Packaging, transport and storage
Bibliography