Method for measuring the quantity of super absorbent polymers (SAP) in a sample obtained from post-consumer absorbent sanitary products comprising at least one portion of a portion of cellulose and/or a portion of plastic in addition to a portion of SAP, said post-consumer absorbent sanitary products having been, preferably, previously subjected to at least one treatment comprising the separation of said portions; the SAP contained in said sample comprise linear polyacrylate polymers (LPA) and/or crosslinked polyacrylate polymers (CLP A), the method comprising the steps of: a) contacting a first fraction of the sample with an aqueous solution comprising a known quantity Co of a water-soluble cation Xy and obtaining a suspension comprising a solid fraction and a liquid fraction, b) after a period of time Ti, separating the solid fraction from the liquid fraction and measuring the residual quantity Ci of said water-soluble cation Xy in said liquid fraction, c) calculating the difference Co-Ci between the known quantity Co and the quantity C i of the cation Xy remaining after the time period T i, d) contacting a second fraction of the sample with a solution comprising a salt for a period of time T2 and obtaining a suspension comprising a solid fraction and a liquid fraction, wherein said salt promotes the passage of said water-soluble cation Xy of metabolic origin and not already bound to the SAP into said liquid fraction, e) separating the solid fraction from the liquid fraction and contacting, for a period of time T3, the solid fraction with a solution comprising an acid for displacing said water- soluble cation Xy of metabolic origin already bound to the SAP and promoting its passage into said solution, f) measuring the quantity Cb of said water-soluble cation Xy contained in said liquid fraction obtained in step d) after the period of time T2, and the quantity Ch of said water-soluble cation Xy contained in said aqueous solution containing an acid, preferably HC1, after the time period T3, g) calculating the difference Ch - Cb, this difference being indicative of the quantity of said cation contained in the sample and derived from the metabolism and bound to the SAP, h) calculating the quantity of SAP contained in said sample as a function of the difference Cq-Ci and of the difference Ch-Cb-

A METHOD FOR MEASURING THE QUANTITY OF SUPER ABSORBENT POLYMERS IN POST-CONSUMER ABSORBENT SANITARY PRODUCTS

Caruso, Tonino
;
Iannece, Patrizia;
2021

Abstract

Method for measuring the quantity of super absorbent polymers (SAP) in a sample obtained from post-consumer absorbent sanitary products comprising at least one portion of a portion of cellulose and/or a portion of plastic in addition to a portion of SAP, said post-consumer absorbent sanitary products having been, preferably, previously subjected to at least one treatment comprising the separation of said portions; the SAP contained in said sample comprise linear polyacrylate polymers (LPA) and/or crosslinked polyacrylate polymers (CLP A), the method comprising the steps of: a) contacting a first fraction of the sample with an aqueous solution comprising a known quantity Co of a water-soluble cation Xy and obtaining a suspension comprising a solid fraction and a liquid fraction, b) after a period of time Ti, separating the solid fraction from the liquid fraction and measuring the residual quantity Ci of said water-soluble cation Xy in said liquid fraction, c) calculating the difference Co-Ci between the known quantity Co and the quantity C i of the cation Xy remaining after the time period T i, d) contacting a second fraction of the sample with a solution comprising a salt for a period of time T2 and obtaining a suspension comprising a solid fraction and a liquid fraction, wherein said salt promotes the passage of said water-soluble cation Xy of metabolic origin and not already bound to the SAP into said liquid fraction, e) separating the solid fraction from the liquid fraction and contacting, for a period of time T3, the solid fraction with a solution comprising an acid for displacing said water- soluble cation Xy of metabolic origin already bound to the SAP and promoting its passage into said solution, f) measuring the quantity Cb of said water-soluble cation Xy contained in said liquid fraction obtained in step d) after the period of time T2, and the quantity Ch of said water-soluble cation Xy contained in said aqueous solution containing an acid, preferably HC1, after the time period T3, g) calculating the difference Ch - Cb, this difference being indicative of the quantity of said cation contained in the sample and derived from the metabolism and bound to the SAP, h) calculating the quantity of SAP contained in said sample as a function of the difference Cq-Ci and of the difference Ch-Cb-
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4772903
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