戊唑醇在香蕉不同组织中的残留动态分析

目的]研究戊唑醇在香蕉不同组织中的残留动态,为戊唑醇在香蕉上及其废弃物的安全利用提供理论依据.方法]戊唑醇水乳剂以整株（包括叶片和果穗）喷雾和叶面喷雾（果穗套袋）两种施药方式在香蕉植株上施用,利用高效液相法检测施药后不同时间内戊唑醇在果实、叶片、叶柄和假茎中的残留量,一级动力学方程式计算其半衰期,比较分析戊唑醇在不同组织内的消解动态规律.结果]戊唑醇在香蕉不同组织内的初始着药量0～0.945 mg/kg.叶面施药方式下戊唑醇在叶片中的半衰期为7.7 d、叶柄为0.9 d、假茎为1.5 d,未在果实内检出戊唑醇;整株施药方式下戊唑醇在果实中的半衰期为27.0 d.结论]戊唑醇在果实内的降解速度明显慢于其他组织,施药时避开果实叶面施用可有效避免其在果实中残留;施药后28 d时香蕉各组织中的戊唑醇含量均低于其在香蕉上的最大残留限量,可安全回收利用.

Residue dynamics of tebuconazole in different tissues of banana

Objective]The residues of tebuconazole were studied in different banana tissues to provide support for the salty of banana and its waste. Method]With the foliar and the whole plant spray application, tebuconazole EW was sprayed on the banana plants including leaf and cluster and the residues of tebuconazole were determinated by HPLC. According to the first-order kinetic equation, the half-life of tebuconazole was calculated and the degradation dynam- ics in different tissues （fruit, leaf, petiole, pseudostem） were also analyzed. Result ]The initial deposits of tebucona- zole in different banana tissues were found to be in the range of 0 to 0.945 mg/kg. At the foliar spray application, the half lives of tebuconazole in leaves, petioile and pseudostem were 7.7, 0.9 and 1.5 d, respectively. The tebu- conazole was not detected in fruits. At the whole plant spray application, the half-life of tebuconazole in fruits was 27.0 d. Conclusion]The degradation of tebuconazole in fruits was significantly slower than other banana tissues. Foliar spray application could reduce the residue of tebuconazole in fruits effectively. The contents of tebuconazole in differ- ent tissues of banana are below MRLs on the 128th day after spray application, therefore the tissues could be recycled and used safely.