香港六合彩开奖 12884:2000

薪械写芯褋褌褍锌薪芯薪邪褉褍褋褋泻芯屑褟蟹褘泻械

袨锌褍斜谢懈泻芯胁邪薪芯 (袙械褉褋懈褟 1, 2000)

袩芯褋谢械写薪懈泄褉邪蟹褝褌芯褌锌褍斜谢懈泻邪褑懈褟斜褘谢锌械褉械褋屑芯褌褉械薪胁 2020. 袩芯褝褌芯屑褍写邪薪薪邪褟胁械褉褋懈褟芯褋褌邪械褌褋褟邪泻褌褍邪谢褜薪芯泄.

CHF 129

袩械褉械褋褔懈褌邪褌褜褕胁械泄褑邪褉褋泻懈械褎褉邪薪泻懈 (CHF) 胁

孝械蟹懈褋

This International Standard specifies sampling, cleanup and analysis procedures for the determination of polycyclic

aromatic hydrocarbons (PAH) in ambient air. It is designed to collect both gas-phase and particulate-phase PAH

and to determine them collectively. It is a high-volume (100 l/min to 250 l/min) method capable of detecting

0,05 ng/m3 or lower concentrations of PAH with sampling volumes up to 350 m3. The method has been validated

for sampling periods up to 24 h.

Precision under normal conditions can be expected to be _ 25 % or better and uncertainty _ 50 % or better (see

annex A, Table A.1).

This International Standard describes a procedure for sampling and analysis for PAH that involves collection from

air on a combination fine-particle filter and sorbent trap, and subsequent analysis by gas chromatography/mass

spectrometry (GC/MS).

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