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環(huán)氧乙烷殘留色譜儀的維護要點

 更新時間:2025-07-28 點擊量:335
環(huán)氧乙烷殘留色譜儀是‌專門用于定量檢測醫(yī)療器械、食品包裝等產(chǎn)品中環(huán)氧乙烷(EO)及其代謝物2-氯乙醇(2-CE)殘留量的氣相色譜設(shè)備‌。該儀器通過氣相色譜分離技術(shù)(常用氫火焰離子化檢測器FID)結(jié)合標(biāo)準(zhǔn)化的前處理方法。
相色譜法(GC)核心流程‌:
‌樣品前處理‌:醫(yī)療器械/口罩等樣品經(jīng)純水萃取或頂空處理,釋放環(huán)氧乙烷(EO)及代謝物2-氯乙醇(2-CE)‌;
‌色譜分離‌:極性色譜柱(如聚乙二醇毛細(xì)柱)分離目標(biāo)物,F(xiàn)ID檢測器定量分析,檢出限達(dá)μg/g級‌;
‌頂空進樣優(yōu)化‌:全自動頂空進樣器(如HS-20A)控制加熱平衡,避免手動進樣誤差,重現(xiàn)性±0.5%‌。
分析方法:
1、樣品制備:取醫(yī)用防護上與人體接觸的EO相對殘留含量的部件進行試驗,截為5mm長碎塊(或10mm2片狀物,取1.0g放入20mL頂空瓶,精密加人5mL水密封,60℃±1℃溫度下平衡40min。
2、平衡完成之后直接通過頂空進樣器進樣至氣相色譜中進行分析,通過計算機用色譜工作站記錄環(huán)氧乙烷的面積(或峰高),根據(jù)標(biāo)準(zhǔn)曲線計算出樣品相應(yīng)的濃度。如果所測樣品結(jié)果不在標(biāo)準(zhǔn)曲線范圍內(nèi),應(yīng)改變標(biāo)準(zhǔn)溶液的濃度重新作標(biāo)準(zhǔn)曲線。
3、采用頂空-色譜法測試醫(yī)用防護中環(huán)氧乙烷的殘留具有方便快捷、精密度高、選擇性強等優(yōu)點。
維護要點‌:
‌色譜柱保養(yǎng)‌:每月用正十八烷驗證柱效,老化溫度不超過色譜柱上限‌;
‌氣源純度‌:氫氣發(fā)生器分子篩每季度更換,防止水分干擾FID火焰‌;
‌電極防護‌:FID檢測器停機后升至150℃烘烤2小時,避免積碳‌。
 

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