Differential Pulse Stripping Voltammetric Determination of Cadmium(Ⅱ)in Liver and Kidney with Dithizone/Multi-Walled Carbon Nanotubes Modified Electrode
-
摘要: 采用双硫腙/多壁碳纳米管修饰电极差分脉冲溶出伏安法测定猪肝和猪肾中镉(Ⅱ)的含量.优化的试验条件如下:① 0.1 mol·L-1乙酸-乙酸钠缓冲溶液(底液)的pH为6.0;② 双硫腙的用量为3 μL;③ 多壁碳纳米管的用量为10 μL;④ 沉积时间为300 s;⑤ 沉积电位为-1.2 V;⑥ 平衡时间为40 s.镉(Ⅱ)在一定的浓度范围内与其峰电流呈线性关系,方法的检出限(3S/N)为1.0×10-9mol·L-1.方法应用于猪肝和猪肾样品的分析,测定值与石墨炉原子吸收光谱法测定值相符,方法的回收率在94.0%~108%之间.Abstract: Differential pulse stripping voltammetry was applied to the determination of cadmium(Ⅱ) in liver and kidney using dithizone/multi-walled carbon nanotubes modified electrode. The optimized conditions were as follows:① pH of 0.1 mol·L-1 HOAc-NaOAc buffer solution(base solution):6.0;② amount of dithizone:3 μL;③ amount of multi-walled carbon nanotubes:10 μL;④ time of deposition:300 s;⑤ potential of deposition:-1.2 V;⑥ time of equilibration:40 s. The linear relationship between the peak currents and the concentration of cadmium(Ⅱ) was kept in definite ranges,with detection limit of 1.0×10-9mol·L-1. The proposed method was used for the measurement of liver and kidney samples,giving results in consistency with the values obtained by GFAAS with recovery rates in the range of 94.0%-108%.
-
Keywords:
- Differential pulse stripping voltammetry /
- Liver /
- Kidney /
- Cadmium(Ⅱ) /
- Dithizone /
- Multi-walled carbon nanotubes
-
-
[1] 龚大春,邹逸婷.猪肾中镉含量的检测[J].湖北农业科学,2007,46(5):835-836. [2] 张维蔚,叶璐瑶,余超,等.2006-2011年广州市猪内脏铅、镉污染状况分析[J].中国食品卫生杂志,2013(1):76-79. [3] CHATTOPADHYAY P,FISHER A S,HENON D N,et al. Matrix digestion of soil and sediment samples for extraction of lead,cadium and antimony and their direct determination by inductively coupled plasma-mass spectrometry and atomic emission spectrometry[J].Microchim Acta,2004,144:277-283. [4] 李志富,胡作林.电感耦合等离子体原子发射光谱法测定面粉中铅和镉[J].理化检验-化学分册,2011,47(3):299-301. [5] 赖瑢,丘福保,徐镇耿,等.微波消解-溶出伏安法对食品中铜、铅、镉的同时测定[J].分析测试学报,2010,29(2):203-206. [6] 李学章,贺与平,李维香.原子吸收法测定三七中的铜、镉和锂[J].光谱实验室,2004,21(4):818-820. [7] 黄文胜,杨春海,张升辉.双硫腙修饰玻碳电极阳极溶出伏安法测定痕量镉和铅[J].分析化学,2002,30(11):1367-1370. [8] 马伟光,杨铁金.羧基化多壁碳纳米管-Nafion修饰玻碳电极差分脉冲阳极伏安法测定痕量镉[J].理化检验-化学分册,2011,47(11):1343-1345. [9] HAMID A,MOHAMMAD A T. Determination of cadmium(Ⅱ) using carbon paste electrode modified with a Cd-ion imprinted polymer[J].Microchim Acta,2012,178:53-60. [10] LIU Min,FENG Yue-hua,WANG Guang-feng,et al. Determination of cadmium(Ⅱ) using glassy carbon electrodes modified with cupferron,β-naphthol,and multiwalled carbon nanotubes[J].Microchim Acta,2012,177:221-228.
计量
- 文章访问数: 3
- HTML全文浏览量: 0
- PDF下载量: 0