Studies On Irradiation Degradation Of Deltamethrin In Tea

This thesis mainly researches on Deltamethrin's irradiation degeneration in tea-leaf under the influence factors of different irradiation dosage,different residuce dose and different package of tea etc.The main findings are as follows:1.γ-ray has the certain function on degenerating Deltamethrin in tea-leaf.The residuce dose of Deltamethrin in tea-leaf is higher than original residuce dose under the irradiation dosage of 7 kGy.When irradiation dosage＞7 kGy,the residuce dose of Deltamethrin in tea-leaf recedes obviously.2.The research also indicates that the rate of Deltamethrin's degeneration is interrelated with residuce dose in the tea-leaf,and the rate of degeneration afler exposure is proportional to the consistency of Deltamethrin in tea-leaf.3.Discontinuous irradiation and the length of discontinuity time have degeneration influence on Deltamethrin in tea-leaf.Irradiation in batches is better than one-off irradiation at same dosage in degeneration,and the number of Irradiation in batches' times has little effect on irradiation.But the length of discontinuity time has a strong impact on it. When discontinuity time reaches 20 min,the rate of Deltamethrin's degeneration could be about 25%,when 120 min,it can be more than 50%.4.As for whether Deltamethrin's exposure degeneration in tea-leaf has the relationship with package,research indicates that they have according to experiments.The tea vacuum packing has better effect than ordinary package on Deltamethrin's exposure degeneration in tea-leaf,but there is no fixed proportion in the rate of degeneration between the two.It shows reverse change along with irradiation dosage in the mass,and shows positive-going to original consistency of Deltamethrin in tea-leaf.5.This experiment indicates that increase the moisture content of Deltamethrin in tea-leaf is favor of Deltamethrin's irradiation degeneration.When the moisture content is more than 5%,the effect of Deltamethrin's degeneration in tea-leaf is obvious.When reaches 7%,the rate of Deltamethrin's degeneration in tea-leaf is about 25%.When moisture content reaches 10%,the rate of degeneration can be 34%.6.Deltamethrin,Fenvalerate,Bifenthrin,which are 3 kinds of pyrethroid agricultural chemical all can be reduced after irradiation,and the rate of degeneration increases when irradiation dosage increases.Under the same irradiation dosage,there's no obvious proportion on the rate of degeneration in 3 kinds of agricultural chemical in tea-leaf,and it makes no difference.Mixture pyrethroid agricultural chemical has little effect on Deltamethrin's irradiation degeneration in tea-leaf,and 3 kinds ofpyrethroid agricultural chemical has no relationship with each other.