ISO 19670:2017 pdf – Fertilizers and soil conditioners — Solid urea aldehyde slow release fertilizer — General requirements

ISO 19670:2017 pdf – Fertilizers and soil conditioners — Solid urea aldehyde slow release fertilizer — General requirements.
1 Scope This document 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. 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 does not apply to mixtures of nitrogenous fertilizers containing solid urea aldehyde slow release fertilizer. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5315, Fertilizers — Determination of total nitrogen content — Titrimetric method after distillation ISO 7409, Fertilizers — Marking — Presentation and declarations ISO 7410, Fertilizers and soil conditioners — Final samples — Practical arrangements ISO 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 liquid chromatography (HPLC) ISO 25705:2016, Fertilizers — Determination of urea condensates using high-performance liquid chromatography (HPLC) — Isobutylidenediurea and crotonylidenediurea (method A) and methylen-urea oligomers (method B) 3? Terms? and? definitions For the purposes of this document, the terms and definitions given in ISO 8157 and the following apply. ISO and IEC 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/
3.2 cold water insoluble nitrogen CWIN insoluble nitrogen fractions in urea formaldehyde or methylene urea products that are insoluble in phosphate buffer solution (pH 7,5) or distilled water at 25 °C during a 15 min period 3.3 cold water soluble nitrogen CWSN soluble nitrogen fractions in urea formaldehyde or methylene urea products that are soluble in phosphate buffer solution (pH 7,5) or distilled water at 25 °C during a 15 min period Note 1 to entry: CWSN = Total nitrogen – CWIN 3.4 hot water insoluble nitrogen HWIN insoluble nitrogen fractions in urea formaldehyde or methylene urea products that are insoluble in phosphate buffer solution (pH 7,5) at 100 °C during a 30 min period 3.5 hot water soluble nitrogen HWSN soluble nitrogen fractions in urea formaldehyde or methylene urea products that are soluble in phosphate 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 only HWSN only soluble nitrogen fractions in urea formaldehyde or methylene urea products that are soluble in phosphate buffer solution (pH 7,5) at 100 °C during a 30 min period and insoluble in phosphate buffer solution (pH 7,5) at 25 °C during a 15 min period Note 1 to entry: HWSN only = HWSN – CWSN = CWIN – HWIN
5 Analytical methods 5.1 Determination of the appearance It shall be determined by visual method. 5.2 Determination of the mass fraction of total nitrogen It shall be determined in accordance with ISO 5315. 5.3 Determination of the mass fraction of ureic nitrogen It shall be determined in accordance with ISO 19746. 5.4 Determination of the mass fraction of CWIN 5.4.1 Principle Extraction of the test portion in phosphate buffer solution (pH 7,5) or distilled water at 25 °C. Filtration of insoluble residue, washing and determination of nitrogen content in insoluble residue. 5.4.2 Reagents 5.4.2.1 Phosphate buffer solution (pH 7,5). Dissolve 14,3 g KH 2 PO 4 and 91,0 g K 2 HPO 4 in water and dilute to 1 l. Dilute 100 ml of this solution to 1 l. 5.4.2.2 Anhydrous ethanol. 5.4.2.3 Reagents listed in ISO 5315. 5.4.3 Apparatus 5.4.3.1 Usual laboratory apparatus.