Feng Junhe, Guo Baoyuan, Lin Jin-Ming, Xu Jianzhong, Zhou Hong, Sun Yuyou, Liu Yao, Quan Yangke, Lu Xiaoming
Department of Chemistry, Capital Normal University, Beijing 100037, China.
Se Pu. 2008 Nov;26(6):667-71. doi: 10.1016/s1872-2059(08)60031-0.
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 electroosmotic 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.
采用毛细管区带电泳（CZE）结合间接紫外检测法，对爆炸残留物中的5种阴离子（氯酸根、高氯酸根、硝酸根、亚硝酸根和硫酸根）和2种阳离子（铵根和钾离子）进行了分离和测定。阳离子分离的电解质缓冲液为10 mmol/L吡啶（pH 4.5）-3 mmol/L 18-冠-6-醚。铵根和钾离子在不到2.6分钟内实现基线分离，检测限分别为0.10 mg/L和0.25 mg/L（S/N = 3）。阴离子分离的电解质缓冲液由40 mmol/L硼酸-1.8 mmol/L重铬酸钾-2 mmol/L硼酸钠（pH 8.6）组成，四甲基氢氧化铵（TMAOH）用作电渗流改性剂。所有5种阴离子在不到4.6分钟内得到良好分离，检测限范围为0.10 - 1.85 mg/L（S/N = 3）。该方法成功应用于实际样品检测，以确定爆炸物的类型。
