<?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">sample preparation</topic></authority><related type="other"><topic>sampling</topic></related><related type="broader"><topic>preparing</topic></related><variant type="other"><topic>preparation, sample</topic></variant> <note xml:lang="en"><![CDATA[ In analytical chemistry, sample preparation refers to the phase of scientific investigation that follows sampling and precedes measuring. It encompasses all the processes involved in readying a sample for examination, including extraction from a larger sample, and all the techniques of reduction and processing required to produce a representative test sample. ]]></note></mads>