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BS ISO 18642:2016 pdf free

BS ISO 18642:2016 pdf free.Fertilizer and soil conditioners一Fertilizer grade urea一General requirements
This International Standard specifies the general requirements regarding testing methods, sampling and preparation of test sample, marking and labelling, package, transport, and storage of fertilizer grade urea.
This International Standard is applicable to urea in solid form, e.g. granular, prilled, or pastilled, which is made by the reaction of ammonia with carbon dioxide. Urea can be classified by its intended use,industrial and/or agricultural. It is mainly used as fertilizer in the field of agriculture. This International Standard is only applicable to fertilizer grade urea in the field of agriculture.
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 5315, Fertilizers一Determination of total nitrogen content一Titrimetric method after distillation
ISO 7410, Fertilizers and soil conditioners一Final samples一Practical arrangements
ISO 7742:1988, Solid fertilizers一Reduction of samples
ISO 8397, Solid fertilizers and soil conditioners一Test sieving
ISO 8633, Solid fertilizers一Simple sampling method for small lots
ISO 18643, Fertilizers and soil conditioners一Determination of biuret content of urea-based fertilizers一HPLC method
EN 13466-1:2001, Fertilizers一Determination of water content一(Karl Fischer methods) 一Part 1:Methanol as extracting medium
Mix all the increments (Collected as in 6.1) 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, A.2) or the quartering method (see ISO 7742:1988, 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 earlier as rapidly as possible to avoid loss or gain of moisture. BS ISO 18642 pdf free download.

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