摘要
用线性扫描极谱法研完了在B—R缓冲溶液中2-羟基-4-甲氧基二苯甲酮（又名BP-3）的极谱行为。实验表明，以pH=4．90的B—R缓冲溶液和0．1mol／L KCl溶液作为底液，BP-3产生还原渡，其二阶导数峰电位为-1．2lV（vs．SCE），峰电流与其浓度在9．46×10^-7～4．73×10^-5mol／L范围内呈线性关系，线性方程为ip”（pA／s^2）=-0．03996＋3．307×10^5C，相关系数r=0．9999。初步讨论了电极过程及电极反应机理，结果表明该波为不可逆吸附波。用标准加入法测定了合成试样及市售防晒护肤霜中BP-3的质量分数。
The polarographlc behavior of 2-hydroxy-4-methoxybenzophenone at pH = 4.90 B-R buffer solution was studied by linear sweep polarography. Experiments found out that 2-hydroxy-4-methoxybenzophenone has a second-order derivative peak with peak potential at - 1.21 V （vs. SCE）. The peak current is proportional to the concentration of 2-hydroxy-4-methoxy-benzophenone over the range from 9.46 × 10^-7 mol/L to 4.73 × 10^-5 mol/L. The linear regression equation is ip＂ （μA/s^2 ）= -0. 039 96 ＋ 3. 307 × 10^5 c, with the correlation coefficient as 0. 999 9. The mechanism of electrode reaction was investigated simply, the result showed the polarographic wave was irreversible adsorption wave. The percentage content of 2-hydroxy-4-methoxy-benzophenone in synthetic sample and the Suntan skin cream was determinated by the polarographic standard addition method.
出处
《化工科技》
CAS
2006年第1期13-16,共4页
Science & Technology in Chemical Industry
基金
湖北省自然科学基金资助项目(2003ABA062)
