[Determination of inorganic ions in explosive residues by capillary zone electrophoresis].
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.
Feng
Junhe
J
Department of Chemistry, Capital Normal University, Beijing 100037, China. fengjunhecranr@163.com
Guo
Baoyuan
B
Lin
Jin-Ming
JM
Xu
Jianzhong
J
Zhou
Hong
H
Sun
Yuyou
Y
Liu
Yao
Y
Quan
Yangke
Y
Lu
Xiaoming
X
D002021:Buffers; D019075:Electrophoresis, Capillary / Q000379:methods*; D053834:Explosive Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007287:Inorganic Chemicals / Q000032:analysis* / Q000302:isolation & purification; D013997:Time Factors
D002021:Buffers; D053834:Explosive Agents; D007287:Inorganic Chemicals