用电解重量分析法电位测定法测定人造黄油和黄油中的镉、铅和铜。

Determination of cadmium, lead, and copper in margarines and butters by galvanostatic stripping chronopotentiometry.

作者信息

Szłyk Edward, Szydłowska-Czerniak Aleksandra

机构信息

Faculty of Chemistry, Nicolaus Copernicus University, 87-100 Toruń, Poland.

出版信息

J Agric Food Chem. 2004 Jun 30;52(13):4064-71. doi: 10.1021/jf040032w.

DOI:10.1021/jf040032w

PMID:15212449

Abstract

A galvanostatic stripping chronopotentiometric (GSCP) method for the simultaneous determination of cadmium, lead, and copper in commercial margarines and butters is described. Quantitative analyses of heavy metals in the mineralized fat samples, except standard addition method, were carried out automatically. The mean concentrations of Cd(II), Pb(II), and Cu(II) in different types of margarines and butters varied from 9.1 to 26.2, 9.2-14.2, 298.2-364.0 microg x kg(-)(1), respectively, that is below the legal requirements. The detection limits are 0.02, 0.02, and 0.06 microg x L(-)(1) for Cd(II), Pb(II) and Cu(II), while the reproducibilities are 3.3, 5.7, and 2.0%, respectively. The comparable precision (RSD = 0.76-4.5 and 0.87-4.9%) and recovery (96.7-102.2% and 96.1-103.2%) for the proposed GSCP and standard GFAAS methods, demonstrate the benefit of GSCP method in the routine analysis of heavy metal ions in fats.

摘要

描述了一种恒电流溶出计时电位法（GSCP），用于同时测定市售人造黄油和黄油中的镉、铅和铜。除标准加入法外，矿化脂肪样品中重金属的定量分析均自动进行。不同类型人造黄油和黄油中Cd（II）、Pb（II）和Cu（II）的平均浓度分别在9.1至26.2、9.2 - 14.2、298.2 - 364.0μg·kg⁻¹之间，均低于法定要求。Cd（II）、Pb（II）和Cu（II）的检测限分别为0.02、0.02和0.06μg·L⁻¹，重现性分别为3.3%、5.7%和2.0%。所提出的GSCP方法与标准石墨炉原子吸收光谱法（GFAAS）具有相当的精密度（相对标准偏差RSD = 0.76 - 4.5和0.87 - 4.9%）和回收率（96.7 - 102.2%和96.1 - 103.2%），证明了GSCP方法在脂肪中重金属离子常规分析中的优势。