ISO 19670:2017
Fertilizers and soil conditioners — Solid urea aldehyde slow release fertilizer — General requirements
ISO 19670:2017 specifies general requirements, analytical methods, sampling and preparation of test sample, marking and labelling, packaging, transport and storage for solid urea aldehyde slow release fertilizer.
ISO 19670:2017 applies to pure solid urea aldehyde slow release fertilizer, i.e. urea formaldehyde (UF), methylene urea (MU), crotonylidene diurea (CDU), isobutylidene diurea (IBDU). This document does not apply to mixtures of nitrogenous fertilizers containing solid urea aldehyde slow release fertilizer.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 Visual inspection
4.2 Requirement of solid urea aldehyde slow release fertilizer
5 Analytical methods
5.1 Determination of the appearance
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 CWIN
5.4.1 Principle
5.4.2 Reagents
5.4.3 Apparatus
5.4.4 Procedure
5.4.5 Expression of results
5.5 Determination of the mass fraction of HWIN and AI
5.5.1 Principle
5.5.2 Reagents
5.5.3 Apparatus
5.5.4 Procedure
5.5.5 Expression of results
5.6 Determination of the mass fraction of nitrogen from IBDU and CDU
6 Sampling and preparation of test sample
6.1 Sampling method
6.1.1 Products in bags
6.1.2 Products in bulk
6.2 Reduction of samples
6.3 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 Requirement of solid urea aldehyde slow release fertilizer
5 Analytical methods
5.1 Determination of the appearance
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 CWIN
5.4.1 Principle
5.4.2 Reagents
5.4.3 Apparatus
5.4.4 Procedure
5.4.5 Expression of results
5.5 Determination of the mass fraction of HWIN and AI
5.5.1 Principle
5.5.2 Reagents
5.5.3 Apparatus
5.5.4 Procedure
5.5.5 Expression of results
5.6 Determination of the mass fraction of nitrogen from IBDU and CDU
6 Sampling and preparation of test sample
6.1 Sampling method
6.1.1 Products in bags
6.1.2 Products in bulk
6.2 Reduction of samples
6.3 Test sample preparation
7 Marking and labelling
8 Packaging, transport and storage
Bibliography