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  • BSI
    21/30335555 DC BS ISO 20917. Determination of available phosphorous and soluble potassium extracted with neutral ammonium citrate and quantified by ICP-OES
    Edition: 2021
    $44.66
    / user per year

Description of 21/30335555 DC 2021

This International Standard specifies an ICP-OES method for the determination of the ammonium citrate, disodium-EDTA soluble phosphorus and potassium content in fertilizer extract solutions. This standard is suitable for all inorganic fertilizer products, whether compound or complex fertilizer products or blends thereof and straight concentrated fertilizer products. For organic fertilizers and for liquid fertilizers containing phosphorous acid (H3PO3 or phosphite), an alternative method that specifically measures PO4 is preferred since the ICP-OES measures all elemental phosphorus, which can result in a high bias for these types of fertilizer materials. Due to the inability of the ICP-OES to differentiate between phosphorus species, under normal operating conditions, this method is primarily intended for fertilizer materials in which the source(s) of phosphorus is known. This standard is suitable for reference purposes.



Standard Number21/30335555 DC
TitleBS ISO 20917. Determination of available phosphorous and soluble potassium extracted with neutral ammonium citrate and quantified by ICP-OES
StatusDefinitive
Publication Date2021-01-06
Identical National Standard OfISO/DIS 20917
DescriptorsPhosphorus inorganic compounds, Ammonium inorganic compounds, Agricultural equipment, Agricultural materials, Fertilizer distributors
ICS65.080 Fertilizers
CommitteeCII/37
PublisherBSI
Pages39

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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