摘 要：采用稱量法配制了異丁烷、二氯甲烷、苯等16種室內(nèi)揮發(fā)性有害有機(jī)物的混合標(biāo)準(zhǔn)氣體，各物質(zhì)濃度為1ppm，平衡氣為氮?dú)狻?biāo)準(zhǔn)氣體采用天平稱量定值，通過實(shí)驗(yàn)室內(nèi)和實(shí)驗(yàn)室間氣相色譜法比對(duì)分析考察其配制準(zhǔn)確性，并通過各物質(zhì)濃度隨時(shí)間及瓶內(nèi)壓力的變化考察了其濃度的均勻性和穩(wěn)定性。結(jié)果表明我們研制生產(chǎn)的室內(nèi)揮發(fā)性有害有機(jī)物混合標(biāo)準(zhǔn)氣體量值準(zhǔn)確，均勻性、穩(wěn)定性好，各項(xiàng)技術(shù)指標(biāo)滿足國家對(duì)二級(jí)標(biāo)準(zhǔn)物質(zhì)的要求。
關(guān)鍵詞：重量法；混合標(biāo)準(zhǔn)氣體；定值；均勻性；穩(wěn)定性
中圖分類號(hào)：TB99 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1672-4984（2007）01-0001-04
Preparation of 16 hazardous VOCs standard mixture
TAN He-ping， SUN Deng-feng， FANG Zheng， MA Tian
（National Institute of Measurement and Testing Technology，Chengdu 610021，China）
Abstract:1ppm Hazardous VOCs standard mixture containing 16 compounds such as i-butane，dichloromethane，benzene，etc.in UHP nitrogen was prepared by gravimetric method. The results of GC analysis and the compare among these results of few laboratories were used to confirm the accuracy of the gravimetric preparation.Relationships between time or pressure and uniformity or stability were also investigated. Thess results indicated that concentrations of those mixture compounds in cylinder are accuracy，uniform and stable，which can fulfill requirements of Warrant Reference Materials（WRM） absolutely.
Key words：Gravimetric method；Standard mixture；Concentration analysis；Uniformity；Stability
