食品中铜、铅、锡的微分电位溶出法同时测定

Simultaneous Determination of Copper, Lead and Tin in Food by Differential Potentiometric Stripping Analysis

用微分电位溶出分析法 ,以 pH2.4的0.06mol·L-1 草酸、4×10-4 mol·L-1 半胱氨酸、4.4×10-5mol·L-1 十六烷基三甲基溴化铵 (CTMAB)为底液 ,同时测定了几种罐头食品中的铜、铅、锡含量 ,3元素峰电位分别为 -0.26、 -0.46、 -0.60V(vsSCE) ,与极谱络合吸附波法对照 ,结果令人满意。

In the buffer solution(pH 2.4)containing 0.06 mol·L-1 oxalic acid, 4×10-4 mol·L-1 L _ cysteine and 4.4×10-5 mol·L-1 CTMAB, the simultaneous determination of copper, lead and tin in canned food is reported by differential potentiometric stripping analysis. The peak potentials are at-0.26, -0.46 and -0.60 V(vs SCE)for Cu2+, Pb2+ and Sn4+, respectively. The method has been used to determine these elements in some canned foods with satisfactory results.