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采用柠檬酸 柠檬酸钠作为缓冲体系 ,使用负高压 ,对Cl-,NO3 -,HCO3 -和H2 PO4 -等 4种常见阴离子进行了分离检测 ,研究了缓冲剂的种类、浓度、pH值及操作电压对分离的影响。在选定的条件下 ,4种离子的定量线性范围 :Cl-5 0× 10 -5mol/L～ 2 5× 10 -3 mol/L ,NO3 -6 0× 10 -5mol/L～ 2 0× 10 -3 mol/L ,HCO3 -5 0× 10 -6mol/L～ 2 0× 10 -4 mol/L ,H2 PO4 -6 0× 10 -5mol/L～ 1 0× 10 -3 mol/L ;检出限 :Cl-1 5× 10 -5mol/L ,NO3 -3 0×10 -5mol/L ,HCO3 -1 0× 10 -6mol/L ,H2 PO4 -2 0× 10 -5mol/L ;峰面积的RSD (n =6 ) :Cl-3 1% ,NO3 -3 3% ,HCO3 -2 6 % ,H2 PO4 -2 9%。并应用选定条件对自来水样品进行了分析。
The citric acid sodium citrate was used as a buffer system, and negative ions were used for the determination of four common anions, Cl-, NO3 -, HCO3 - and H2 PO4 -. The types, concentration, pH value and operation of the buffer The effect of voltage on the separation. Under the selected conditions, the linear ranges of the four kinds of ions are Cl-5 0 × 10 -5 mol / L ~ 2 × 10 -3 mol / L, NO 3 -6 0 × 10 -5 mol / L ~ 2 × 10 -3 mol / L, HCO3 -5 0 × 10 -6 mol / L to 2 × 10 -4 mol / L, and H2 PO4 -6 0 × 10 -5 mol / L to 1 × 10 -3 mol / L; The detection limits were as follows: Cl-1 5 × 10 -5 mol / L, NO 3 -3 0 × 10 -5 mol / L, HCO3 -1 0 × 10 -6 mol / L, H2 PO4 -2 0 × 10 -5 mol / The area RSD (n = 6): Cl-3 1%, NO3 -3 3%, HCO3 -2 6%, H2 PO4 -2 9%. Tap water samples were analyzed using the selected conditions.