摘要
以四乙氧基硅烷合成溶胶-凝胶薄膜,包埋偶氮试剂制备得到对二氧化氮具有灵敏响应的传感膜;与分支光纤等元件耦合成光纤传感器,通过累积吸收法能够现场测定空气中的低浓度二氧化氮.其检出限为每小时5ng/L;测定相对标准偏差为4.4%(n=6,C(NO2)=200ng/L,1h)。实验表明,CO2、NO、SO2、NO等共存气体在低浓度下对传感器测定NO无明显干扰。
Sol-gel sensing film for nitrogen dioxide was prepared with tetraethylorthosilicate （TEOS） , which immersed sulfanilamide as diazotizing reagent and N, N-dimethyl-l-naphthyl-amine as coupling reagent. The fiber optical sensor was consist of the sensing film and optical fiber, which could detect NO2 in air in the dynastic range from 60-600 ng/L with an accumulation method. The recipes of Sol-gel film were optimized to prepare the sensing film with high specific surface and good sensitivity to NO2 at ng/L level in air. The acidity and concentrations of the sensing reagents as well as the flow rate of the sample gas were optimized. The effect of the coexist gases such as N2,O2, CO2, SO2 and NO on the sensor was studied. The detection limit of sensor was 5 ng/L hourly, and the relative standard deviation was 4.4% （ n = 6, CNO2 = 200 ng/L, 1 hour）, which showed the sensor could be applied to monitoring NO2 at low level in air.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2005年第9期1215-1218,共4页
Chinese Journal of Analytical Chemistry
基金
国家九五攻关计划(No.96-A23-02-08)
深圳市科技计划(No.B121)资助项目
