液相辉光放电原子发射光谱法测定溶液中Cd的方法研究  被引量:8

Determination of Cadmium in Aqueous Solution by Liquid Glow Discharge- Atomic Emission Spectrometry

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作  者:杨恕修 陆泉芳[1,2] 孙对兄[2,3] 张海涛[1] 郑继东[1] 俞洁[1] 

机构地区:[1]甘肃省生物电化学与环境分析重点实验室西北师范大学化学化工学院,甘肃兰州730070 [2]西北师范大学学报编辑部,甘肃兰州730070 [3]甘肃省原子分子物理与功能材料重点实验室西北师范大学物理与电子工程学院,甘肃兰州730070

出  处:《分析测试学报》2016年第6期662-667,共6页Journal of Instrumental Analysis

基  金:国家自然科学基金项目(21367023;21567025;11564037);甘肃省自然科学基金项目(1308RJZA144);西北师范大学青年教师科研能力提升计划(NWNU-LKQN-12-9;NWNU-LKQN-13-14)

摘  要:通过改进放电装置,建立了一种新的液相辉光放电原子发射光谱(LGD-AES)测量溶液中Cd元素的方法。探索了放电电压和Cd浓度对放电稳定性、光谱信号强度、测定灵敏度和检出限的影响,并将测试结果与电解液阴极放电-原子发射光谱(ELCAD-AES)的分析结果进行比较。结果表明,当放电电压从600V升至720 V时,电子温度从2 000 K升至3 300 K,电子密度从2.47×10^(16)cm^(-3)降至1.77×10^(16)cm^(-3),Cd的发射光谱强度增强,灵敏度升高,检出限为1.22~2.95 mg/L。LGD-AES技术检测水中金属离子具有放电设备小型、能量消耗低、放电稳定性高、背景光谱干扰小和灵敏度高等优点。A new reactor termed as liquid glow discharge( LGD) was modified and designed according to the principle and characteristic of electrolyte cathode glow discharge( ELCAD) for the determination of cadmium in aqueous solution. The effects of discharge voltage and solution concentration on the discharge stability, signal strength, sensitivity and detection limit were investigated in detail.The detection limits of present work were compared with the values measured by ELCAD. The results showed that with the increase of discharge voltage from 600 V to 720 V,the electronic temperatures were increased from 2 000 K to 3 300 K,electron densities were decreased from 2. 47 × 10^(16)cm^(-3)to1. 77 × 10^(16)cm^(-3),emission intensities were enhanced and the sensitivity of the method for cadmium was increased with limits of detection of 1. 22- 2. 95 mg / L. All results demonstrated that the LGD-AES is a promising technique in detection of metal elements in aqueous soltion because of small size of discharge equipment,low energy consumption,high discharge stability,small background spectrum interference and high sensitivity.

关 键 词:电解液阴极辉光放电(ELCAD) 液相辉光放电(LGD) 等离子体 原子发射光谱(AES) 镉元素 

分 类 号:O657.3[理学—分析化学] O614.242[理学—化学]

 

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