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BS ISO 22018:2021

BS ISO 22018:2021

$102.76

Fertilizers, soil conditioners and beneficial substances. Determination of EDTA soluble phosphorus content in inorganic fertilizers

Published By Publication Date Number of Pages
BSI 2021 22
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This document specifies the method for the determination of the EDTA soluble phosphorus content of inorganic fertilizers. The method is applicable for fertilizers composed of or blended from multiple sources such as superphosphate, ammonium phosphate, triple superphosphate, and/or nitrophosphate. It is not suitable for fertilizers containing calcium magnesium phosphates.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
10 5.1 Ethylene diamine tetraacetic acid disodium salt dihydrate (C10H14N2Na2O8·2H2O) solution (37,5 g/l, eq. 0,1 mol/l).
5.2 Quimociac reagent.
5.3 Nitric acid solution (HNO3, 1 + 1).
6 Apparatus and materials
6.1 Ordinary laboratory apparatus.
11 7 Test procedure
7.1 General
7.2 Preparation of test sample
7.3 Weigh of test portion
7.4 Extraction of EDTA soluble phosphorus
7.5 Determination of the EDTA soluble phosphorus content
7.6 Blank test
12 8 Calculation and expression of results
8.1 General
8.2 Precision
8.2.1 Ring test
8.2.2 Repeatability, r
8.2.3 Reproducibility, R
9 Test report
13 Annex A (informative) Ring test report
21 Bibliography

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BS ISO 22018:2021
$102.76