浊度滴定法

报道了一种实用的浊度传感器及浊度滴定仪，以及一种利用此仪器检测溶液的浑浊程度（溶液中散射光相对强度）来判断沉淀反应滴定终点的方法。将一束光线通入溶液，在溶液中与其垂直的方向上，利用内置浊度传感器检测散射光相对强度；随着滴定剂的加入，溶液将渐变得浑浊，散射光相对强度逐渐增强。如果沉淀反应完全且溶解度足够小，散射光相对强度将在化学计量点处达最大值，由此可判断滴定终点。以AgNO3溶液滴定NaCl溶液为例俊证了浊度滴定法，结果表明：浊度滴定法样化学指示剂法适用于更低的浓度；在适当的条件下浊度滴定法的精密度和准确度均可＜0.2%。

Turbidity Titrimetry

A turbidity sensor, a turbidity titrator, and a method to indicate the titration end-point of precipitation reaction by the measurement of the relative intensity of the scattered light in the titrate solution were introduced. A visible light-emitting diode (LED) was used as a light source and a photodiode was served as optical detectors. Light on the detectors created a current flow through the diodes. With the addition of the titrant, the titrate solution will be turbidness and the intensity of the scattered light in the solution will increase gradually. If the precipitation reaction proceeded completely and the solubility of the precipitation was small enough, the intensity of the scattered light could reach the maximum at the stoichiometric point; thus, the titration end-point could be indicated. The NaCl solution was titrated by AgNO 3 solution as an example.