摘要
采用离子色谱法测定浓磷酸中的Cl~–,SO_4^(2–),NO_3~–。将浓磷酸稀释至400倍体积,以0.22μm滤膜过滤,使用阴离子交换色谱–抑制电导检测器测定浓磷酸中的Cl~–,SO_4^(2–),NO_3~–。采用高容量色谱柱,以1.0 mmol/L Na_2CO_3–24 mmol/L Na OH混合液为流动相,将无机阴离子与浓磷酸基体分离,以标准加入法定量。氯离子、硝酸盐、硫酸盐的检出限为0.05~0.12 mg/L,加标回收率为96.6%~100.0%,测定结果的相对标准偏差为7.0%~10.0%(n=5)。该方法分离效果好,可用于浓磷酸中Cl~–,SO_4^(2–),NO_3~–的同时测定。
Cl-, SO42-, NO3- in phosphoric acid were determined by ionchromatography. After being diluted to 400 fold volume and filtered with 0.22 μm film filtration, Cl-, SO42- and NO3- were determined by ion exchange chromatography with sup-pressed conductivity detection. The anions were separated from phosphoric acid with high capacity column and 1.0 mmol/L Na2CO3-24 mmol/L NaOH as the mobile phase and quantified by standard addition method. The detection limits were 0.05-0.12 mg/L, the recoveries were 96.6%-100.0%, and the relative standard deviations were 7.0%-10.0%(n=5). This method can be used for simultaneous determination of inorganic anions in concentrated phosphoric acid with good seperation.
出处
《化学分析计量》
CAS
2016年第1期61-63,共3页
Chemical Analysis And Meterage
