ISO 19670 pdf download – Fertilizers and soil conditioners – Solid urea aldehyde slow release fertilizer一General requirements

ISO 19670 pdf download – Fertilizers and soil conditioners – Solid urea aldehyde slow release fertilizer一General requirements.
5.4.3.2 Water bath, capable of being maintained at (25 ± 2) DC.
5.4.3.3 Quantitative filter paper (intermediate speed).
5.4.3.4 Apparatus listed in ISO 5315.
5.4.4 Procedure
Two analyses shall be performed simultaneously for the determination.
Place I g to 1,4 g test portion (accurate to 0,000 1 g) in 50 ml beaker wet with ethanol (5.4.2.2). Add 20 ml phosphate buffer solution (5.4.2.1) or distilled water and let stand 15 mm in the water bath maintained at 25°C ± 2°C and stir at 5 mAn intervals during standing. Transfer the supernate to a piece of filter paper (5A.33) in a long-stem funnel and wash the residue four or live times by decanting with water of 25 °C ± 2 °C Finally, transfer all the residue to the filter paper and complete washing until the hltrac measures 250 ml. Determine nitrogen Content In the filter paper and the residue in accordance with ISO 5315.
Carry out a blank test at the same time as the determination, using the same procedure, using the same reagents, hut omitting the test portion.
5.4.5 Expression of results
The CWIN content, w, expressed as a mass Fraction (%). is given by Furmula 11:
5.5,3 Apparatus
5.5.3.1 Usual laboratory apparatus.
5.5.3.2 Water bath, capable of being maintained at (100 ± 2) °C.
5.5.3.3 Apparatus listed In 5.43.3 and SA.3.4.
5.5.4 Procedure
Two analyses shall be performed simultaneously for the determination.
Place an accurately weighed test portion containing 0.12 g CWIN (accurate to 0.000 1 g) in a 250 ml tallForm beaker. Add 100 ml 100°C phosphate buffer solution (5AZJJ from a graduated cylinder to the test portion, stir, cover and imnwre promptly In a boiling water bath (S.S.3.2) so that liquid In the beaker is below the water level in the water bath. Maintain the water bath at 98 °C to 100 °C, check with a thermometer and stir at 10 mm intervals. After exactly 30 mAn, remove the beaker from the water bath and filter promptly through a piece of filter paper (5.4.3.3). If filtration takes more than 4 mm. discard determination. Repeat the deterniination, adding I g celite (5.i2.2) as filter-aid just before removing the beaker from the water bath, stir and filter,
Wash the insoluble residue completely onto the filter paper with boiling water and continue washing until the total volume used is 100 ml, Complete washing before the filtrate becomes cloudy or its temperature drops to below 60 °C. Determine total nitrogen In the wet filter paper and residue In accordance with ISO 5315.
Carry out a blank test at the same time as the determination, using the same procedure and reagents, but omitting the test protion.
5.5.5 ExpressIon of results
5.5.5.1 HWIN content of the sample
The HWIN content, w2, expressed as a mass fraction (%). is given by Formula (2):
7 Marking and labelling
The marking and labelling should follow the legislation. Further rnformation can be provided If appropriate and when the legislation allows.
Any chemical classifications on the label should conform to the United Nations’ Globally Harmonized System of Classification and Labelling of Chemicals’ (GHS) and applicable national or regional adoption thereof.
Anything concerning the labels should refer to the latest version of ISO standards and local/regional legislations.
7.1 The following information should appear on the face of the containers:
a) the total nitrogen content;
b) the ureic nitrogen content (where this is at least 1 % by weight);
c) the nitrogen from IHDU/CDU:
d) the nitrogen that is soluble in cold water (CWSN) for urea formaldehyde/methylene urea fertilizer;
e) the nitrogen that is soluble only in hot water (HWSN only) and/orAl forurea formaldehyde/methylene urea fertilizer;
f) the date of production;
g) the net mass;
h) the address and name of the manufacturer.
7.2 A product’s use instructions should be printed on the back of containers. The information should include the name of product, nutrient content, method of usage, storage and usage precautions.
7.3 The single mass value of each container shall be declared (e.g. 50 kg).
7.4 All other information required by ISO 7409 should also appear on the face of the containers.
8 PackagIng, transport and storage
The applicable national or regional safety guidelines for handling and storage should be followed.