摘要
利用液液萃取-气相色谱法同时测定硝基苯(NB)及其还原降解产物亚硝基苯(NSB)和苯胺(AN),研究了采用活性铁还原降解硝基苯时样品中残存的Fe2+,对NB测定的影响以及pH、盐度和过滤方式等因素对测试结果的影响。结果表明:pH和盐度对NB和NSB萃取回收率影响不大,但是AN萃取回收率随pH和盐度的升高而增加;在饱和NaCl溶液和中性/碱性条件下,NB、NSB、AN的回收率分别为90%～95%、85%～90%、70%～75%;提高温度或减小富集倍数能进一步提高AN的萃取回收率;样品中存在Fe2+时,碱性条件下萃取会影响NB的测定;砂芯滤头对NB和NSB有吸附作用,而针式滤头不影响测定结果;利用该法未能检测到NB的降解中间产物-羟基苯胺。
Gas chromatograph using liquid-liquid extraction was applied to detect nitrobenzene （NB） and its degradation products of nitrosobenzene （NSB） and aniline （AN） simultaneously. The effects of pH, salinity and filtration devices on the measurement of NB were investigated. The influence of residual Fe^2＋ from reductive iron process was also discussed in this study. Experimental results indicated that pH and salinity had no effect on the measurement of NB and NSB, but had significant impacts on AN measurement. The recovery of AN was increased with the increasing of pH and salinity. Under neutral or alkaline condition with saturated NaCl solution, the recoveries of NB, NSB and AN could reach 90%-95%,85%-90% ,70%-75% respectively. Higher recoveries could be achieved by increasing temperature and decreasing multiplication factor. Measurement of NB was influenced if extracted under alkaline condition with presence of Fe^2＋. Core filter was observed to adsorb NB and NSB and affect determination results, while syringe falter had no appreciable impact on the determination. The unstable intermediate product, phenylhydroxylamine was detected by this method.
出处
《净水技术》
CAS
2007年第3期69-73,共5页
Water Purification Technology
基金
国家自然科学基金项目(NO.50608056)
同济大学青年优秀人才培养行动计划资助项目(NO.2006KJ033).
关键词
硝基苯
亚硝基苯
羟基苯胺
苯胺
液液萃取
气相色谱
nitrobenzene nitrosobenzene phenylhydroxylamine aniline liquid-liquid extraction gas chromatography
