Study on semi-automatic analyzer for catalytic analysis

研制了一种新型半自动催化法分析仪。该分析仪有一个精密的吸收测量池(约0.3ml，1厘米光路)，用作同时混合反应物的腔室。样品和反应物溶液分别注入串联的三个隔膜式注射器和一个阀式注射器，并通过特氟隆流动系统由空气压力输送到电池。用溴酸甲基橙催化反应测定硫。该分析仪具有良好的分析性能，其灵敏度(反应速率/ng硫)和精密度比通常的手工操作提高了一个数量级。还研制了光路为30 cm的管状池，并在分析仪中配备了一个小混合室，用于灵敏地测量吸光度。在用没食子酸-溴酸盐反应催化测定钒时，管式电池允许在初始显色产物浓度比1-cm电池低约三十分之一的情况下进行示踪。

A new semi-automatic analyzer was developed for catalytic method. The analyzer has a sophisticated cell (about 0.3 ml, 1-cm light path) for absorption measuremrnt,which is used as a chamber for mixing simultaneously reactants. The sample and reactant solutions were injected into three septum-type injectors and a valve-type injector connected in series, respectively, and carried by air pressure through a Teflon flow system to the cell. The analyzer was used to determine sulfur using methylorange bromate catalytic reaction. The analyzer has some outstanding analytical performances, i.e., sensitivity(reaction rate/ ng sulfur) and precision are one-order better than those of the usual manual operation. A tubular cell with 30-cm light path was also developed and equipped in the analyzer with a small mixing chamber for sensitive measurement of absorbance. The tubular cell permited to trace an initial reaction at about one thirtieth lower concentration of colored product compared with use of 1-cm cell in catalytic determination of vanadium using gallic acid-bromate reaction.