Abstract：Strontium element is an indispensable trace element in the human body, and strontium rich mineral water is an important means of supplementing strontium in the human body. At present, the conventional analytical methods used to detect strontium elements in strontium-rich mineral water, such as AAS, AFS, IC, ICP-AES/MS, etc., have the advantages of high detection sensitivity and good detection stability. However, these instruments are bulky, expensive, and energy-intensive, moreover some require inert/special gases, which are not suitable for field, real-time and online continuous monitoring. Therefore, it is of great significance to develop a miniaturized, low-cost and rapid spectral detection technology for the effective measurement of strontium. In recent years, Solution cathode glow discharge-atomic emission spectrometry (SCGD-AES) is a rapidly developing for detecting metal elements in an aqueous solution. Here, the SCGD-AES system was established to measure the concentration of strontium in strontium-rich mineral water. The experimental parameters such as discharge current, sample flow rate and pH on the SBR of strontium were investigated, and the optimal experimental parameters for quantitative analysis of strontium were as follows: 1.85 mL·min-1 for the sample flow rate, 75 mA for the discharge current, and the electrolyte acidified to pH 1.0 by HNO3. 460.77 nm was selected as the strontium analytical spectrum line, and the strontium solution was determined under the above optimal working conditions. The emission spectral stability of strontium was 0.52% (n=21). The strontium concentration shows a linear relationship with its emission intensity in the range of 0.1～20 mg·L-1, and the linear correlation coefficient is 0.999 6. The detection limits of strontium were 29 μg·L-1 for the homemade SCGD-AES. The established SCGD-AES detection system measured three types of strontium-rich mineral water in the market, and the results were agreed with the results of inductively coupled plasma-atomic emission spectrometry. In addition, the recoveries of bottled mineral water are 98.8%~107.6%. The results show that SCGD-AES is an effective method for the determination of strontium in strontium-rich mineral water.
Key words：Solution cthode gow dscharge; Mineral water; Strontium; Detection
郑培超，罗元江，王金梅，胡 强，杨 杨，毛雪峰，赖春红，冯楚辉，何雨桐. 溶液阴极辉光放电-原子发射光谱法测定富锶矿泉水中的锶[J]. 光谱学与光谱分析, 2022, 42(01): 272-276.
ZHENG Pei-chao, LUO Yuan-jiang, WANG Jin-mei, HU Qiang, YANG Yang, MAO Xue-feng, LAI Chun-hong, FENG Chu-hui, HE Yu-tong. Determination of Strontium in Strontium-Rich Mineral Water Using Solution Cathode Glow Discharge-Atomic Emission Spectrometry. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(01): 272-276.
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