BSI PD CEN/TS 17784-1:2022

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Organo-mineral fertilizers. Identification of complexing agents. – Method using UV-Vis spectrophotometry and gravimetry

Published By	Publication Date	Number of Pages
BSI	2022	18

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Description

This document specifies two methods required for the identification of lignosulfonate by UV-Vis spectrophotometry (method A) and gravimetry (method B) in organo-mineral fertilizers. NOTE Lignosulfonate, as a complexing agent, is a natural polymer produced as a by-product of the sulfite method for manufacturing paper from wood pulp in the paper industry. As a natural polymer, it presents a poorly defined and variable chemical structure. It is an intricate mixture of small- to moderate-sized polymeric compounds with sulfonate groups attached to the molecule, and diverse complexing capacity.

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PDF Pages	PDF Title
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7	1 Scope 2 Normative references 3 Terms and definitions 4 Sampling and sample preparation 5 Method A: Determination of phenolic hydroxyl content and 232,5 nm absorbance for the identification of lignosulfonates 5.1 Principle
8	5.2 Reagents 5.3 Apparatus
9	5.4 Procedure 5.4.1 Preparation of stock solution 5.4.2 Solution A (acid) 5.4.3 Solution B (basic) 5.4.4 Solution C 5.4.5 Measurement of phenolic hydroxyl content 5.4.6 Measurement of 232,5 nm absorbance 5.5 Calculation 5.5.1 Phenolic hydroxyl content
11	5.5.2 Lignosulfonic acid content calculated from 232,5 nm absorbance 6 Method B: Determination of organic sulfur content for the identification of lignosulfonates 6.1 Principle 6.2 Reagents
12	6.3 Apparatus
13	6.4 Procedure 6.4.1 Preparation of 0,5 mol/l Iodine I2 solution 6.4.2 Separation of inorganic sulfur 6.4.3 Determination of organic sulfur
14	6.5 Calculation 7 Expression of the results 7.1 Relative phenolic hydroxyl content
15	7.2 Relative organic sulfur content 8 Test report

Additional information

Status	Definitive
Pages	18
Publication Date	2022-07-20
ISBN	978 0 539 17912 5
Standard Number	PD CEN/TS 17784-1:2022
Title	Organo-mineral fertilizers. Identification of complexing agents. – Method using UV-Vis spectrophotometry and gravimetry
Identical National Standard Of	CEN/TS XXX
Descriptors	Fertilizers, Ultraviolet spectrophotometry, Chemical analysis and testing, Instrumental methods of analysis, Spectrochemical analysis
Publisher	BSI
Committee	CII/37
ICS Codes	65.080 - Fertilizers

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BSI PD CEN/TS 17784-1:2022

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