prEN 16109 rev

Fertilizers - Determination of complexing agents - Identification of lignosulfonates prEN 16109 rev

Scope

This document specifies two methods required for the identification of lignosulfonates by UV-Vis spectrophotometry (method A) and gravimetry (method B) in inorganic and 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.
This document is applicable to the fertilizing products blends where a blend is a mix of at least two of the following components: fertilizers, liming materials, soil improvers, growing media, inhibitors, plant biostimulants, and where the following category: inorganic fertilizers or organo-mineral fertilizers is the highest % in the blend by mass or volume, or in the case of liquid form by dry mass. Additional information on eventual interferences in fertilizer product blends is provided in Clause 5.

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