Abstract:

This paper recommended an experiment of determination of 2,4-dichlorophenol in 2,4-D technical material using UV-Vis spectrophotometric method. The concepts of pesticide quality analysis and pesticide related impurities, the principle and application of ultraviolet spectrophotometer, and various sample pretreatment experimental skills such as weighing, vortexing and liquid transferring were involved, so as to enable students to master the methodology and data processing of quantitative determination using ultraviolet spectrophotometry. This experiment can exercise students' comprehensive experimental skills, cultivate their preliminary scientific research thinking, and enhance their practical application ability.

Key words: Student experiment recommendation, Pesticide analysis, UV spectrophotometry, 2,4-D, 2,4-Dichlorophenol