Jul,11

ISO 19670 pdf download

ISO 19670 pdf download

ISO 19670 pdf download Fertilizers and soil conditioners — Solid urea aldehyde slow release fertilizer — General requirements
This document specifies general requirements, analytical methods, sampling and preparation of testsample, marking and labelling, packaging, transport and storage for solid urea aldehyde slow releasefertilizer.
This document 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 doesnot apply to mixtures of nitrogenous fertilizers containing solid urea aldehyde slow release fertilizer.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.Forundated references, the latest edition of the referenced document(including any amendments) applies.IS0 5315,Fertilizers —Determination of total nitrogen content —Titrimetric method after distillationISO 7409, Fertilizers —Marking — Presentation and declarations
ISO 7410, Fertilizers and soil conditioners — Final samples —Practical arrangementsISO 7742,Solid fertilizers — Reduction of samples
ISO 8157, Fertilizers and soil conditioners — Vocabulary
ISO 8633,Solid fertilizers — Simple sampling method for small lots
ISO 19746;2017,Determination of urea content in urea-based fertilizers by high performance liquidchromatography (HPLC)
ISO 25705:2016,Fertilizers — Determination of urea condensates using high-performance liquidchromatography (HPLC) — Isobutylidenediurea and crotonylidenediurea (method A) and methylen-ureaoligomers (method B)
3Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8157 and the following apply.ISO and lEC maintain terminological databases for use in standardization at the following addresses:—IEC Electropedia: available at http://www.electropedia.org/
-ISo online browsing platform: available at https://www.iso.org/obp/3.1
urea aldehyde slow release fertilizer
products of reaction between urea and aldehyde(s) that produce a slow release nitrogenous fertilizerEXAMPLE Urea formaldehyde (UF), methylene urea (MU), crotonylidene diurea (CDU), isobutylidenediurea (IBDU).
3.2
cold water insoluble nitrogencWIN
insoluble nitrogen fractions in urea formaldehyde or methylene urea products that are insoluble inphosphate buffer solution (pH 7,5) or distilled water at 25 Cduring a 15 min period
3.3
cold water soluble nitrogencwSN
soluble nitrogen fractions in urea formaldehyde or methylene urea products that are soluble inphosphate buffer solution (pH 7,5) or distilled water at 25 Cduring a 15 min period
Note 1 to entry: CwSN = Total nitrogen – cWIN
3.4
hot water insoluble nitrogenHWIN
insoluble nitrogen fractions in urea formaldehyde or methylene urea products that are insoluble inphosphate buffer solution (pH 7,5) at 100 °C during a 30 min period
3.5
hot water soluble nitrogenHwSN
soluble nitrogen fractions in urea formaldehyde or methylene urea products that are soluble inphosphate buffer solution (pH 7,5) at 100 C during a 30 min period
Note 1 to entry: HwSN = Total nitrogen – HWIN
3.6
hot water soluble nitrogen onlyHwSN only
soluble nitrogen fractions in urea formaldehyde or methylene urea products that are soluble inphosphate buffer solution (pH 7,5) at 100 °C during a 30 min period and insoluble in phosphate buffersolution (pH 7,5) at 25 °C during a 15 min period
Note 1 to entry: HWSN only = HwSN – cwsN = cWIN – HWIN3.7
activity indexAI
percentage of CWIN (3.2) that is solubilised in hot water (HWSN only) (3.6)
Note 1 to entry: Al = cwINHWIN×100
cwIN
Note 2 to entry: CWIN and HWIN in Note 1 are expressed in the mass fraction (%).
Note 3 to entry: A higher Al indicates better slow release characteristics of urea formaldehyde fertilizer.
4Requirements
4.1 Visual inspection
The product shall be in powder, granules, prills, pellets, pastilles,chips or other solid forms. Visuallyinspect for the presence of contaminant and foreign matter.

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