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电导滴定法始于1891年,现在已成为仪器分析中的一个重要部门,它是在电解质待滴定液中,滴加标准溶液,由导电度(电阻率的倒数)的改变以推定终点的方法。简单的导电率电桥是滑线式惠司登电桥与一个示零用的低电阻听筒,交流电源通常由蜂呜器产生。因为一般蜂鸣器产生交流电的频率与听筒膜片的振动频率较接近,这样灵敏度高。若用交流市电,由于频率太低,影响听筒的灵敏度。用听筒作示零器,虽然装置简单,但因外来杂声常阻碍着零点的辨别,故结果不易精确。
The conductometric titration method, which began in 1891, is now an important part of instrumental analysis. It is a method of dropping a standard solution in the electrolyte to be titrated and estimating the end point by a change in conductivity (the reciprocal of the resistivity). A simple conductivity bridge is a sliding-line Wheatstone bridge with a low-powered, low-noise handset, which is usually produced by a buzzer. Because the general buzzer AC frequency generated and the diaphragm vibration frequency of the handset closer, so high sensitivity. If AC mains, because the frequency is too low, the sensitivity of the handset. With the handset as a pointer device, although the device is simple, but due to foreign noise often hinder the identification of zero, so the result is not easy to accurate.