顶空条件对水中偏二甲肼测定的影响研究  

Influence of Headspace Condition on Determining Unsymmetrical Dimethylhydrazine in Water

作　　者：张伟[1] 吴婉娥[1] 贾瑛[1] 张会坛[1] 

机构地区：[1]西安第二炮兵工程学院,陕西西安710025

出　　处：《化学推进剂与高分子材料》2011年第3期93-95,共3页Chemical Propellants & Polymeric Materials

摘　　要：利用Voager便携式气相色谱仪,运用顶空的方法测定水体中微量的偏二甲肼(UDMH)。着重探索了顶空条件对色谱峰面积的影响,试验结果表明,最佳顶空条件为:盐析剂NaCl的加入质量为1.506 g,平衡温度为30℃,平衡时间为30 min,pH值为14.0,气、液相体积比为2∶1。在最优条件下测定了模拟水样中的UDMH。发现在0.05￣5.0μg/L质量浓度范围内线性方程为Y=14.182 x+0.014 7,R2=0.998,根据IUPAC所得方法检测限为0.018 7μg/L。回收率试验表明,该方法是可靠的。Trace unsymmetrical dimethylhydrazine in water was determined by Voager portable gas chromatograph using headspace method.Influence of headspace condition on chromatography peak area was emphatically investigated.The experiment results show that the optimal headspace conditions are as follows： the added suitable mass of salting-out agent sodium chloride,equilibrium temperature 30℃,equilibrium time 30min,pH value 14.0,gas-liquid volume ratio 2：1.UDMH of the simulative water sample was determined under the optimal conditions.It is found that the linear equation is Y=14.182x＋0.0147,R2=0.998 in UDMH mass concentrateion range of 0.05~5.0 μg/L,the detection limit is 0.0187μg/L according to obtained method by IUPAC.The recovery yield experiments show that this method is reliable.

关 键 词：Voager便携式气相色谱仪 偏二甲肼 顶空气相色谱 

分 类 号：X832[环境科学与工程—环境工程]