28-高芸苔素内酯对韭菜中溴氰菊酯残留降解的影响

The effects of 28-high brassinolide on degradation of deltamethrin residue in leek

为探索28-高芸苔素内酯对韭菜中溴氰菊酯残留降解的影响,以韭菜(Allium tuberosum)为试验材料,0.01%28-高芸苔素内酯可溶液剂为供试药剂,0.04%24-表芸苔素内酯可溶液剂为对照药剂,清水为对照,在溴氰菊酯灌根前1 d对韭菜进行喷雾处理。分别在20 mg/L溴氰菊酯药液灌根处理后0、1、2、3、5、8、12、16 d进行取样,采用改进的QuEChERS方法对韭菜样品进行前处理,用气相色谱质谱联用仪检测韭菜中溴氰菊酯残留量。结果表明,溴氰菊酯灌根后1 d,稀释1000倍的0.01%28-高芸苔素内酯处理的韭菜中溴氰菊酯残留量最低,比清水对照降低了19.73%;喷施1次稀释1000倍的0.01%28-高芸苔素内酯、喷施2次稀释1000倍的0.01%28-高芸苔素内酯和清水对照的韭菜中溴氰菊酯残留量均在灌根后1 d达到最大值,分别为0.0460、0.0583、0.0573 mg/kg;用稀释500、1000、2000倍的0.01%28-高芸苔素内酯分别处理韭菜,溴氰菊酯灌根后1 d,稀释1000倍的0.01%28-高芸苔素内酯处理的韭菜中溴氰菊酯残留量最低,显著低于清水对照和稀释2000倍的0.01%28-高芸苔素内酯处理,与稀释500倍的0.01%28-高芸苔素内酯处理之间差异不显著。

In order to explore the effects of 28-high brassinolide on the degradation of deltamethrin in leeks(Allium tuberosum),with leeks as the test material,0.01%high-brassinolide solvable agent was used as the test agent,0.04% 24-epbrassinolide solvable agent was used as the control agent,and water was taken as the control to spray on the leeks 1 day before deltamethrin root irrigation.The leek samples were taken at 0,1,2,3,5,8,12,16 d after root irrigation of 20 mg/L deltamethrin,respectively.The modified QuEChERS method was used to pretreat the leek samples,and gas chromatography-mass spectrometry was used to detect deltamethrin residue in leek samples.The results showed that one day after deltamethrin root irrigation,the residue of deltamethrin in leeks treated with 0.01% 28-high brassinolide diluted 1000 times was the lowest,which was 19.73% lower than that in water control.The residues of deltamethrin in leeks treated with once dilution of 0.01%28-high brassinolide(1000 times),twice dilution of 0.01% 28-high brassinolide(1000 times)and water control all reached the maximum on one day after root irrigation,which were 0.0460,0.0583,0.0573 mg/kg,respectively.Treated with 500 times,1000 times and 2000 times dilution of 0.01% 28-high brassinolactone,respec⁃tively,one day after deltamethrin root irrigation,the leeks treated with 0.01%28-high brassinolactone dilution of 1000 times had the lowest deltamethrin residue,which was significantly lower than water control and 0.01%28-high brassinolactone treatment at 2000 times dilution,but no significant difference was found between the treatment and 0.01% 28-high brassinolactone treatment at 500 times dilution.