化学研究与应用
化學研究與應用
화학연구여응용
CHEMICAL RESEARCH AND APPLICATION
2014年
10期
1674-1678
,共5页
李晓亮%郑赛晶%王志华%王玉珏
李曉亮%鄭賽晶%王誌華%王玉玨
리효량%정새정%왕지화%왕옥각
烟草%热解残余物%自由基%顺磁共振波谱仪
煙草%熱解殘餘物%自由基%順磁共振波譜儀
연초%열해잔여물%자유기%순자공진파보의
tobacco%solid residue%radicals%electron paramagnetic resonance
使用顺磁共振波谱技术研究了烟草热解残余物中自由基的形成及其在环境中的转化。研究结果表明:烟草热解时会在其残余物上形成大量自由基。热解温度较低时(400~500℃)主要形成以O原子为中心的自由基,而热解温度较高(600~700℃)时,主要形成以C原子为中心的自由基。烟草热解残余物与空气接触后,会生成新的以O原子为中心的自由基,从而使自由基数量在短时间(60~120 min)内增加,随后自由基数量和种类趋于稳定,并可长期存在于环境中。
使用順磁共振波譜技術研究瞭煙草熱解殘餘物中自由基的形成及其在環境中的轉化。研究結果錶明:煙草熱解時會在其殘餘物上形成大量自由基。熱解溫度較低時(400~500℃)主要形成以O原子為中心的自由基,而熱解溫度較高(600~700℃)時,主要形成以C原子為中心的自由基。煙草熱解殘餘物與空氣接觸後,會生成新的以O原子為中心的自由基,從而使自由基數量在短時間(60~120 min)內增加,隨後自由基數量和種類趨于穩定,併可長期存在于環境中。
사용순자공진파보기술연구료연초열해잔여물중자유기적형성급기재배경중적전화。연구결과표명:연초열해시회재기잔여물상형성대량자유기。열해온도교저시(400~500℃)주요형성이O원자위중심적자유기,이열해온도교고(600~700℃)시,주요형성이C원자위중심적자유기。연초열해잔여물여공기접촉후,회생성신적이O원자위중심적자유기,종이사자유기수량재단시간(60~120 min)내증가,수후자유기수량화충류추우은정,병가장기존재우배경중。
This study investigated the formation and environmental fate of radicals on tabacco pyrolysis residues using electron para-magnetic resonance( EPR) spectroscopy. Results indicate that during tabacco pyrolysis,large quantities of free radicals formed on the pyrolysis residues. The radicals were mainly oxygen-centered radicals when tabacoo was pyrolyzed at low tempeatures(400-500℃), whereas they were mainly carbon-centered radicals at higher pyrolysis temperatures(600-700℃). When tabacco pyrolysis residues were exposed to air,new oxygen-centered radicals were formed within the first 60-120 min of exposure,which increased the radical quantiy on the pyrolysis residues. The quantities and types of radicals then did not change much with prolonged exposure,and they could exist in the environment for a long period.