BS ISO 17323:2015 pdf download – Fertilizers and soil conditioners — Sulfur Coated Urea (SCU) — General requirements
1 Scope
This International Standard specifies general requirements, sampling and preparation of test sample,marking and labelling, packaging, transport, and storage for SCU.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 17322, Fertilizers and soil conditioners —Analytical Methods for SCU
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
sulfur coated urea
coated controlled release fertilizer consisting of urea particles coated with sulfur
Note 1 to entry: The product is usually further coated with a sealant and, if necessary, a conditioner to avoid tackiness from the sealant.
[SOURCE: ISO 8157,]
slow-release fertilizers
fertilizer, of which, by hydrolysis and/or by biodegradation and/or by limited solubility, the nutrients available to plants is spread over a period of time, when compared to a “reference soluble ” product, e.g. ammonium sulfate, ammonium nitrate, and urea
[SOURCE: ISO 8157, 2.1.11]
controlled-release fertilizers
fertilizer in which nutrient release is controlled, meeting the stated release rate of nutrient and the stated release time at a specified temperature
Note 1 to entry: Typical examples are coated fertilizers.
[SOURCE: ISO 8157, 2.1.12]
4 Requirements
4.1 Appearance
The product shall be in granules.
4.2 Requirement of sulfur coated urea
SCU products shall be tested to demonstrate conformance with all requirements specified in Table 1 and declared values on containers by the methods specified in ISO 17322.
5 Sampling and preparation of test sample
5.1 Sampling method
5.1.1 Products in bags
Carry out sampling operation by following the procedure described in ISO 8633. Take care to avoid damage to, or destruction of, the coating.
5.1.2 Products in bulk
Carry out sampling operation by following the procedure described in ISO 8633.
5.2 Reduction of samples Mix all the increments (collected as in 5.1) uniformly and promptly to form a single aggregate sample using a device or by hand. The aggregate sample is reduced to about 1 kg by the riffle sample divider method (see ISO 7742:1988, Annex A.2) or the quartering method (see ISO 7742:1988, Annex A.3). Next, divide into two parts for final laboratory samples. The two laboratory samples are put into two clean and dry glass or plastic containers or any other inert material of adequate resistance capable of maintaining the sample in its original condition. The containers shall be fitted with airtight closures. Carry out all the operations described above as rapidly as possible to avoid loss or gain of moisture. Each container shall be secured and sealed following the instruction given in ISO 7410. Each laboratory sample shall be labelled following the instructions given in ISO 7410.The label shall, at minimum, carry the following information:
a) name of manufacturer;
b) name of product;
c) manufacturer’s reference and batch number or production date (if available);
d) lot size;
e) date of sampling;
f) place of sampling;
g) signature of the sampler;
h) signature and name of the person or his representative on whose premises the sample was taken.
One of the containers is used for further quality analysis, while the other is kept for additional analysis in six months.
5.3 Test sample preparation
Select one of the laboratory samples from the two containers obtained in 5.2. Mix the content of the container according to the procedure in ISO 7742. The test sample used for determining total nitrogen, sulfur, biuret, water, and solid content should be reduced to 100 g. Grind this test sample in the grinder until all of the sample has passed through the test sieve of aperture size 0,50 mm. The rest of the content of the container, except the 100 g test sample mentioned above, is used for determination of 1DDR, 7DDR, and particle size. Both of the test samples are put into clean and dry bottles to be used for further analysis.
6 Marking and labelling
The marking and labelling should follow the legislation. Further information can be provided if appropriate and when the legislation allows. Any labelling recommendations should conform to the United Nations “Globally Harmonized System of Classification and Labelling of Chemicals” (GHS) and applicable national or regional adoption thereof. Anything referring to the labels should refer to the latest version of ISO standards and local/regional legislations.