Development and Intelligent Investigation of Fluoride Ion Detection Equipment Based on Spectrophotometric Method

Fluorine is one of the important trace elements needed by human body, but excessive intake of fluorine is harmful to health. Local fluorosis is a typical geochemical disease, with a wide distribution area and serious harm in China, among which drinking water fluorosis accounts for more than 90% of the total number of patients. Traditional methods to measure fluorine ion content in water (such as ion chromatography, ion selective electrode method, gas chromatography and atomic absorption spectrometry, etc.) require complex laboratory instruments, high cost, cumbersome operation, and inconvenient field measurement at any time. Therefore, it is particularly important to develop convenient and effective monitoring equipment and methods for fluorine content. Based on spectrophotometry, this project designed a simple device with low cost and quick as well as convenient detection of fluorine content in water, which can help people detect whether drinking water is lower than the fluoride ion content limit set by China's drinking water standards at any time, so as to avoid the harmful intake of high fluoride water. Based on Lambert Beer's law, SPADNS reagent of fluorine is selected in this device. The standard curve of absorbance (y) and fluorine concentration (x) is obtained by experiment, which is y=-0.3897x+1.333. According to the standard curve, the concentration of fluorine in water can be accurately obtained. After verification, this device can measure the concentration of fluorine in water quickly and conveniently. The device meets the daily water quality testing needs of residents in high fluorine areas.