水中酚的膜萃取分离流动注射技术测定的研究

本文提出了硅橡胶膜在线萃取分离流动注射技术测定水样中苯酚的方法。由于水样中的苯酚透过硅橡胶进入萃取液的萃取量随时间的增加和温度的升高而增大，故采用停流技术及升高温度以降低酚的检出限。     

The Potentialities of Using a Graphite-Silicone Rubber Composite Electrode in the Determination of Propranolol

A graphite silicone-rubber composite electrode (GSR) was used for the determination of propranolol in drug formulation. Cyclic voltammetry (CV) at the GSR presented an irreversible oxidation peak at + 0.8 V vs. SCE, in Britton Robinson (B-R) buffer pH 7.4. The quantitative determination was carried out using differential pulse voltammetry (DPV). Under optimized parameters a linear dynamic range from 5.0 to 80.6 µ mol L^?1 with a detection limit of 1.1 µ mol L^?1 was observed. A repeatability of 4.5 ± 0.1 µA (n = 10) peak current was found after 10 successive DPV voltammograms of propranolol in the same solution after surface renovations. Using the proposed electrode, propranolol was quantified in a pharmaceutical formulation with results that agreed within 95% confidence level (t-test) with those from an official method.     

流动注射膜分离测定水中的苯胺

本文提出了用硅橡胶膜在线分离的流动注射紫外度法测定水样中的苯胺。该方法的检出限为１ｍｇ／Ｌ，苯胺含量在２－２００ｍｇ／Ｌ范围内呈良好的线性，对５０ｍｇ／Ｌ试样１２次测定的相对标准偏差为１．２％，１ｈ能测３５个样品。用本方法测定了几种水样中苯胺的含量，回收率均达９０％以上。