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Citation: SUO Zhi-Rong, ZHANG Hong-Fang, YU Hao, ZHENG Jian-Bin. Oscillographic Determination of VB₁₂ via PAN-Co Coordination Compound[J]. Chinese Journal of Applied Chemistry, ;2002, 19(4): 381-383. shu

Oscillographic Determination of VB₁₂ via PAN-Co Coordination Compound

1.
Institute of Electroanalytical Chemistry, Northwest University, Xi'an 710069

Corresponding author: ZHENG Jian-Bin,
Received Date: 7 June 2001
Available Online: 31 October 2001
Fund Project: 国家自然科学基金(29775018) (29775018)国家教育部高等学校骨干教师资助计划项目(GG-150-71006-2877) (GG-150-71006-2877)陕西省教育厅自然科学专项基金(01JK076)资助项目 (01JK076)

1-(Pyridylazo)-2-naphthol(PAN) can cause a sensitive incision on the oscillogram in NaOH solution, and the incision depth would decrease linearly with the increase of the concentration of Co²⁺. Based on this oscillographic characteristic, second order differential oscillographic voltammety is developed for Co²⁺ determination. The linear range of the determination of Co²⁺ is 2.00×10^-7~8.20×10^-6 mol/L and the detection limit is 1.00×10^-7 mol/L. RSD is 1.8% for eight successful determinations of 4.20×10^-6 mol/L Co²⁺. Satisfactory results were obtained by this method in determination of VB₁₂ content in VB₁₂ injection liquid.
- vitamin B₁₂,
- oscillographic analysis,
- simple oscillographic voltammetry,
- pyridylazonaphthol
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Oscillographic Determination of VB12 via PAN-Co Coordination Compound

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Oscillographic Determination of VB₁₂ via PAN-Co Coordination Compound