<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">sulfation</topic></authority><related type="broader"><topic>weathering</topic></related><variant type="other"><topic>sulfating</topic></variant><variant type="other"><topic>sulphation</topic></variant> <note xml:lang="en"><![CDATA[ Refers to the creation of salts or esters of sulfuric acid that occurs when sulfate ions are incorporated into molecules. In a conservation science context sulfation most often refers to chemical weathering of stone by airborne pollution. ]]></note></mads>