ISO 15958 pdf download

ISO 15958 pdf download Fertilizers — Extraction of water soluble phosphorus
The method is applicable to all fertilizers,including compound fertilizers, where water solublephosphorus is to be determined.
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.EN 1482-2，Fertilizers and liming materials — Sampling and sample preparation — Part 2: Samplepreparation
EN 12944-1, Fertilizers and liming materials and soil improvers — Vocabulary — Part 1: General termsEN 12944-2,Fertilizers and liming materials and soil improvers —Vocabulary —Part 2:’Terms relating tofertilizers
3Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12944-1 and EN 12944-2 apply.ISO and lEC maintain terminological databases for use in standardization at the following addresses:-ISO online browsing platform: available at https://www.iso.org/obp
一IEC Electropedia: available at http://www.electropedia.org/
4Principle
Extraction in water by shaking under the specified conditions.
5 sampling
Sampling is not part of the method specified in this document. A recommended sampling method isgiven in EN 1482-1.
Sample preparation shall be carried out in accordance with EN 1482-2.Grinding of the laboratorysample is recommended for homogeneity reasons.
6Reagents
6.1Water, distilled or demineralized.
7Apparatus
7.1500 ml graduated flask, e.g.Stohmann.
7.2 Rotary shaker, 35 to 40 turns per minute.7.3Dry pleated filter, phosphate free.
8Procedure
8.1Test portion
Weigh, to the nearest 0,001 g,5 g of the laboratory sample and place it in a graduated flask (7.1).8.2 Extraction
Add to the test portion in the flask 450 ml of water (6.1), the temperature of which shall be between20 C and 25 °C.
Shake in the rotary shaker (7.2) for 30 min.
Then make up to the mark with water, mix thoroughly by shaking and filter through a dry pleatedfilter (7.3).
9 Test report
The test report shall contain at least the following information:
a) all information necessary for the complete identification of the sample;
b) the test method used with reference to this document including its publication year，i.e.ISO 15958:2019;
c)test results obtained;
d) the date of sampling and sampling procedure (if known);e)the date when the analysis was finished;
f) whether the requirement of the repeatability limit has been fulfilled;
g) all operating details not specified in this document, or regarded as optional, together with details
of any incidents occurred when performing the method, which might have influenced the testresult(s).