<?xml version="1.0" encoding="utf-8"?><metadata xmlns:dc="http://purl.org/dc/elements/1.1/"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dcterms="http://purl.org/dc/terms/"><dc:title xml:lang="en-EN">detection limit           #00151</dc:title><dc:identifier>https://digilab.ptb.de/oiml-g-18/vocab/skos/394</dc:identifier><dc:language>en-EN</dc:language><dc:publisher xml:lang="en-EN">Julia Neumann</dc:publisher><dcterms:created>2022-12-19 09:13:30</dcterms:created><dcterms:isPartOf xsi:type="dcterms:URI">https://digilab.ptb.de/oiml-g-18/vocab/</dcterms:isPartOf><dcterms:isPartOf xml:lang="en-EN">OIML G18 Controlled Vocabulary</dcterms:isPartOf><dc:format>text/html</dc:format> <dc:description xml:lang="en-EN"><![CDATA[ (1) The detection limit is sometimes defined as an output signal equal to some other multiple (e.g., two or ten) of the noise level [2]. The noise level is the random background output signal of an instrument when sampling a blank or clean filtered air. (2) In this Document, the concentration of an airborne pollutant in either a gas or vapor phase is most often expressed in terms of the volume fraction of the pollutant in air: parts- per-million (ppm) [v/v (10-6)]. Conditions of ]]> </dc:description></metadata>