米酵菌酸（BA）具有剧烈毒性，为了研究BA经紫外照射后的降解效果，以BA-甲醇水为研究模型，考察紫外照射强度、BA初始浓度、液层厚度对BA的降解效果，并对其降解曲线和降解方程进行拟合。结果表明，紫外光照射能有效降解BA，且降解过程符合一级动力学方程；紫外强度越强、BA初始越低、液层厚度越薄，BA的降解速率越快。在紫外强度为187 μW/cm2，初始浓度为2.5 μg/mL，厚度为2 mm时，2 h后的降解率达到96.82%。用SPSS软件建立各影响因素与光解速率常数的单独模型并进行线性回归，紫外照射强度、BA初始浓度、液层厚度三个影响因素的模型拟合度分别为0.9540、0.9347、0.9643。在此基础上，用多元线性回归方法建立紫外照射强度（X1）、BA初始浓度（X2）、液层厚度（X3）与紫外降解速率常数k（Y）的综合模型，模型的拟合度为0.972，回归方程显著。本研究结果为紫外降解BA提供了理论基础。

Bongkrekic acid is a highly toxic compound, in order to study the degradation effect of bongkrekic acid (BA) after ultraviolet irradiation, the standard solution of bongkrekic acid (BA) - methanol/water was used as the research object in this research, and the degradation effect of UV irradiation intensity, initial concentration of bongkrekic acid and thickness of liquid layer were investigated, and the degradation curve and degradation equation were fitted. Results showed that the UV irradiation can effectively reduce bongkrekic acid, and the higher degradation rate can be achieved under the higher UV intensity, the lower initial bongkrekic acid as well as the smaller thickness of the liquid layer; a degradation rate of 96.82% can be reached under 187 μW/cm2 of intensity and 2.5 μg/mL of initial concentration as well as a 2 mm of thickness liquid layer. Using SPSS software to establish a separate model of each factor and photolysis rate constant, and the linear regression was conducted, the model fitting degrees of the three factors were 0.9540, 0.9347 and 0.9643, respectively. On this basis, the comprehensive model of UV irradiation intensity (X1), initial concentration of myelic acid (X2), liquid layer thickness (X3) and UV irradiation constant (Y) was established by multiple linear regression method, the fitting degree of the model was 0.972, meaning that the regression equation was significant. The results of this study provide a theoretical basis for the degradation of bongkrekic acid by ultraviolet irradiation.

广东省科技计划项目（2019B020208008）