论文部分内容阅读
目的采用离子色谱氢氧根体系技术,优化检测方法建立包装饮用水中痕量溴酸盐的快速检测方法。方法使用氢氧化钾溶液作为淋洗液,采用InpacAS19阴离子柱(4 mm×250 mm),电导检测器检测,在淋洗液起始浓度为9 mmol/L KOH,进行梯度淋洗程序,进样体积为200μl,流速为1.00 ml/min,抑制电流为115 mA,柱温为30℃,池温30℃的条件下进行检测,运行时间18 min,外标法定量。结果溴酸盐线性范围为2.5~30μg/L,相关系数r≥0.999 3,方法检出限为0.51μg/L,定量下限为1.27μg/L,批内精密度为1.21%~3.40%,批间精密度分别为1.51%~4.09%,加标回收率为98%~104%。结论该研究建立的检测方法灵敏度高,进样量少,选择性好,分析时间短,检测结果稳定可靠,满足包装饮用水中痕量溴酸盐检测的要求。
OBJECTIVE To establish a rapid method for the determination of trace bromate in drinking water by ion chromatography with hydroxyl radical technology and optimization of detection methods. Methods Potassium hydroxide solution was used as the eluent, and InpacAS19 anion column (4 mm × 250 mm) was used. The conductivity detector was used to detect the eluent. The initial elution concentration was 9 mmol / L KOH. The volume of 200μl, the flow rate of 1.00 ml / min, the inhibition current of 115 mA, the column temperature of 30 ℃, the pool temperature 30 ℃ under the conditions of detection, running time 18 min, external standard. Results The linear range of bromate ranged from 2.5 to 30 μg / L with a correlation coefficient of r ≥ 0.99 3. The detection limit was 0.51 μg / L, the limit of quantification was 1.27 μg / L, and the intrabatch precision was 1.21% -3.40% The precision was 1.51% ~ 4.09%, the spiked recoveries were 98% ~ 104%. Conclusion The detection method established in this study has the advantages of high sensitivity, low injection volume, good selectivity, short analysis time and stable and reliable detection results, which meets the requirement of trace bromate detection in packaged drinking water.