锡膜修饰玻碳电极测定药品中铋的含量

采用同位电沉积法将Bi^(3+)和Sn^(2+)还原在玻碳电极表面上,建立了示差脉冲阳极溶出伏安法(DPASV)测定Bi^(3+)的新方法。实验结果表明:Bi^(3+)在0.10 mol/L H_2SO_4溶液中在-0.90 V同位富集1.0×10^(-3)mol/L Sn^(2+)150 s后,Bi^(3+)L范围内呈线性关系,线性方程为Ip=0.959 c+0.496 3,相关系数为L,用同一电极对同一个样品进行了15次平行测定,相对标准偏差RSD为3.28%,样品加标回收率为98.48%, RSD为1.05%。该方法用于测定胃铋治药品中Bi(III)的含量,结果满意。

Electrochemical Behavior of Electrodeposited Sn Films： Possible Negative Electrode for Na^＋ Rechargeable Batteries

Tin films on copper substrate, obtained by electrodeposition procedure, were structural and electrochemical characterized. In particular to investigate the possibility to use such metal as possible negative electrode in Na＋ rechargeable batteries, EPS （electrochemical potential spectroscopy） and galvanostatic charge/discharge cycling of the electrodes were investigated, at room temperature in organic electrolyte. Three crystalline and one amorphous phases were identified as well as high discharge capacity （738 mAb/g） was obtained after 4 cycles. Unfortunately material fading, due to the internal stress during sodiation/desodiation process, causes poor cyclability.