XIANGNian-nian,HUANGZhao-yan,LIUXu,et al.Ion Chromatography for Simultaneous Determination of Industrial Grade Sodium Acetate and Citric Acid[J].China Water & Wastewater,2023,39(22):150-154.
离子色谱法同时测定工业级乙酸钠和柠檬酸
- Title:
- Ion Chromatography for Simultaneous Determination of Industrial Grade Sodium Acetate and Citric Acid
- Keywords:
- ion chromatography; sodium acetate; citric acid
- 摘要:
- 建立了一种离子交换色谱法用于同时测定工业级乙酸钠和柠檬酸。选用Melrose A Supp 5-250/4.0型无机分析柱，以碳酸钠-碳酸氢钠混合溶液作为淋洗液，采用抑制型电导检测器进行检测。在该条件下，乙酸钠和柠檬酸分离度较高，且乙酸根和柠檬酸根在1.00~20.0 mg/L浓度范围内与其峰面积线性良好，相关系数均不低于0.999，方法检出限为0.15 mg/L，6次重复测定结果的相对标准偏差<5%，样品加标回收率为98.0%~102%。与滴定检测方法相比，检测结果无显著差异。该离子色谱方法前处理操作更加简便，而且可以快速对样品中乙酸根和柠檬酸根进行定性定量分析，检测效率较滴定法提升4倍。该方法灵敏度高、操作简便、检测结果准确，可用于工业级乙酸钠和柠檬酸含量的检测。
- Abstract:
- This paper established a method for simultaneous determination of industrial grade sodium acetate and citric acid based on ion exchange chromatography. Acetate and citrate were separated on Melrose A Supp 5-250/4.0 inorganic analysis column with sodium carbonate and sodium bicarbonate solution as eluent and eventually determined by suppressed conductance detector. Under these conditions, the separation efficiency of sodium acetate and citric acid was high, and the peak area of acetate and citrate showed good linearity in the range of 1.00-20.0 mg/L, and the correlation coefficients was no less than 0.999. The detection limit of the method was 0.15 mg/L, the relative standard deviation of 6 repetitions was less than 5%, and the spiked recoveries were between 98.0% and 102%. Compared with titration detection method, there was no significant difference in detection results. And the pretreatment of this ion chromatography method was more simple, the qualitative and quantitative analysis of acetate and citrate in samples was more quickly, and the detection efficiency was increased by 4 times. The method is sensitive, easy to operate and accurate, which is suitable for the determination of industrial grade sodium acetate and citric acid.
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