毛细管区带电泳技术快速分离检测爆炸残留物中的无机离子  

Determination of inorganic ions in explosive residues by capillary zone electrophoresis

作　　者：冯俊鹤[1,2] 郭宝元[3] 林金明[2] 徐建中 周红 孙玉友 刘耀 权养科 鲁晓明[1] 

机构地区：[1]首都师范大学化学系,北京100037 [2]清华大学化学系生物有机磷化学与化学生物学重点实验室,北京100084 [3]中国科学院生态环境研究中心生态化学与环境毒理学国家重点实验室,北京100085 [4]公安部物质鉴定中心,北京100038

出　　处：《色谱》2008年第6期667-671,共5页Chinese Journal of Chromatography

基　　金：国家重点基础研究发展计划(“973”计划)项目(No.2007CB714507);教育部高等学校博士点基金项目(No.20070003026)

摘　　要：利用间接紫外毛细管区带电泳方法完成了对爆炸残留物中7种无机离子(K+,NH4+,NO2-,NO3-,SO42-,ClO3-,ClO4-)的分离检测。阳离子测定采用的缓冲体系为10mmol/L吡啶(pH4.5)-3mmol/L冠醚,K+和NH4+在2.6min内达到基线分离,检出限分别为0.25mg/L和0.10mg/L(S/N=3)。阴离子测定采用的缓冲体系为40mmol/L硼酸-1.8mmol/L重铬酸钾-2mmol/L硼酸钠(pH8.6),氢氧化四甲铵为电渗流改性剂,5种阴离子在4.6min内达到基线分离,检出限为0.10～1.85mg/L。该方法已成功地应用于实际爆炸物样品种类的判定分析,取得了很好的结果。Five anions（chlorate,perchlorate,nitrate,nitrite,and sulfate）and two cations（ammonium and potassium）in explosive residues have been separated and determined by capillary zone electrophoresis（CZE）with indirect ultraviolet detection.The electrolyte buffer for the cation separation was 10 mmol/L pyridine（pH 4.5）-3 mmol/L 18-crown-6-ether.Ammonium and potassium ions were baseline separated in less than 2.6 min with the detection limits of 0.10 mg/L and 0.25 mg/L（S/N=3）,respectively.The electrolyte buffer for the anion separation consisted of 40 mmol/L boric acid-1.8 mmol/L potassium dichromate-2 mmol/L sodium tetraborate（pH 8.6）,and tetramethyl ammonium hydroxide（TMAOH）was used as electro-osmotic flow modifier.All five anions were well separated in less than 4.6 min with the detection limit range of 0.10-1.85 mg/L（S/N=3）.The method was successfully used in real sample investigations to confirm the type of explosives.

关 键 词：毛细管区带电泳 间接紫外检测 无机离子 爆炸残留物 

分 类 号：O658[理学—分析化学]