钴(Ⅱ)-β-巯基丙酸-NaNO_2体系的极谱催化波研究  

Studies on the Polarographic Catalytic wave of Cobalt(Ⅱ) β Mercaptopropionic Acid (MPA) Sodium Nitrite System

作　　者：魏显有[1] 刘云惠[1] 王秀敏 檀建新[1] 

机构地区：[1]河北农业大学食品科学系

出　　处：《分析试验室》1997年第3期4-7,共4页Chinese Journal of Analysis Laboratory

基　　金：河北省自然科学基金

摘　　要：在ｐＨ３．８的Ｈ２ＳＯ４－ＮＨ４Ａｃ介质中，Ｃｏ（Ⅱ）－β－巯基丙酸（ＭＰＡ）－ＮａＮＯ２体系产生－灵敏的极谱催化波，峰电位在－０．８４Ｖ（ｖｓ．ＳＣＥ），钴浓度在０．０２～１００ｎｇ／ｍＬ范围内与峰电流呈线性关系。检出限为０．０１ｎｇ／ｍＬ。本文对极谱波的性质和机理进行了初步探讨。本法用于土壤中总钴和有效钴的测定，结果满意。In 0.04mol/L H 2SO 4 0.1mol/L NH 4Ac buffer solution at pH 3.8,a ssensitive polarographic catalytic wave of Co(Ⅱ) MPA NaNO 2 system was obtained by single sweep polarography.The peak potential was -0.84V (vs.SCE) and the peak current was linearly related to the concentration of cobalt in the range from 3.4×10 -10 ～1 7×10 -6 mol/L.The detection limit of cobalt was 1.7×10 -10 mol/L.The mechanism of the catalytic wave was studied.The method has been applied to the determination of total cobalt and available cobalt in soil with satisfactory results.

关 键 词：钴 巯基丙醇 亚硝酸钠 极谱催化波 有效钴 土壤 

分 类 号：O614.812[理学—无机化学] S151.93[理学—化学]