采用离子色谱法测定卤水中F-、Cl-、Br-、SO42-和NO3-等5种阴离子的含量。水样经Ion Pac AG18保护柱及Ion Pac AS18分离柱分离,以33 mmol·L-1氢氧化钠溶液为淋洗液,采用抑制电导器检测。F-和Br-在0.50~20.0 mg·L-1范围内,Cl-和SO42-在5.00~200 mg·L-1范围内,NO3-在2.50~100 mg·L-1范围内呈线性,检出限(3S/N)在0.01~0.02 mg·L-1之间。选择2种卤水样品作为基体,加入5种阴离子的标准溶液做回收试验,计算得回收率在97.4%~108%之间。

Contents of 5 anions, including F-, Cl-, Br-, NO3- and SO42-, in brine were determined by ion chromatography (IC). Ion Pac AG18 (protective column) and Ion Pac AS18 (separation column) were used for separation and 33 mmol·L-1 NaOH solution was used as eluant. Inhibitory conductivity detection was adopted in the determination. Linearity for F- and Br- was found in the range of 0.50-20.0 mg·L-1, linearity for Cl- and SO42- was found in the range of 5.00-200 mg·L-1, and linearity for NO3- was found in the range of 2.50-100 mg·L-1, with detection limits (3S/N) in the range of 0.01-0.02 mg·L-1. Two brine samples were selected as matrixes, and test for recovery was made by addition of standard solutions of the 5 anions to the samples, values of recovery found were in the range of 97.4%-108%.