<?xml version="1.0" encoding="utf-8"?><Thesaurus
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	xsi:schemaLocation="http://schemas.bs8723.org/XmlSchema/DD8723-5.xsd">	 <dc:identifier>http://AATesaurus.cultura.gencat.cat/aat/getty_en</dc:identifier>  <dc:title>Tesaurus d&apos;Art i Arquitectura</dc:title>  <dc:creator>Getty Institute</dc:creator>  <dc:subject></dc:subject>  <dc:description><![CDATA[  ]]></dc:description>  <dc:publisher>Getty Institute</dc:publisher>  <dc:date>0000-00-00</dc:date>  <dc:language>en</dc:language><ThesaurusConcept dc:identifier="http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31304774">	<dcterms:created>2026-03-30 20:21:58</dcterms:created><PreferredTerm dc:identifier="http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31304774" xml:lang="en">	<LexicalValue>ion exchange</LexicalValue>	<dcterms:created>2026-03-30 20:21:58</dcterms:created></PreferredTerm><ScopeNote xml:lang="en">  <LexicalValue><![CDATA[ Reciprocal and reversible transfer of ions of the same charge between a solution and a relatively insoluble solid in contact with it. Cation exchange and anion exchange are, respectively, the exhange of positively and negatively charged ions. Ion exchange is used in such applications as kidney dialysis, water purification, and chemical analysis. ]]></LexicalValue></ScopeNote><NonPreferredTerm dc:identifier="http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31304775" xml:lang="en">	<LexicalValue>exchange, ion</LexicalValue>		<dcterms:created></dcterms:created>		<USE>http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31304774</USE></NonPreferredTerm><NonPreferredTerm dc:identifier="http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31304776" xml:lang="en">	<LexicalValue>ion-exchange</LexicalValue>		<dcterms:created></dcterms:created>		<USE>http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31304774</USE></NonPreferredTerm><HasHierRelConcept Role="BT">http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31298688</HasHierRelConcept></ThesaurusConcept></Thesaurus>