| 摘要: |
| 【目的】了解烯酰吗啉在马铃薯和土壤中的消解动态，为其防治马铃薯晚疫病时的安全合理用药提供依据。【方法】首先建立一种用气相色谱仪测定烯酰吗啉残留量的检测方法，然后于2012和2013年在山东、吉林进行田间试验，对烯酰吗啉在马铃薯植株、块茎、土壤中的消解动态和最终残留量进行检测，并对施药后可能产生的膳食安全风险进行评估。【结果】2012年和2013年烯酰吗啉在马铃薯植株中的半衰期分别为0.7 d（吉林）、0.6 d（山东）和2.5 d（吉林）、1.2 d（山东），在马铃薯土壤中的半衰期分别为0.7 d（吉林）、0.5 d（山东）和4.3 d（吉林）、9.6 d（山东）。烯酰吗啉施用剂量、施药次数不同，则其在马铃薯植株、块茎及土壤中的最终残留量也不同，烯酰吗啉最终残留量在马铃薯植株中均低于1.240 mg/kg，在土壤中均低于3.405 mg/kg，在马铃薯块茎中均低于或等于检测方法的最低定量限0.02 mg/kg，也低于我国制定的烯酰吗啉在马铃薯中的最大残留限量0.05 mg/kg。采收后马铃薯块茎中烯酰吗啉的估计暴露量为1.64×10-5 mg/kg，风险商值为8.18×10-5 (远小于1)，膳食风险较低。【结论】50%烯酰吗啉可湿性粉剂推荐施药剂量为450 g/hm2，施药次数不超过3次，施药间隔期7 d，采收安全间隔期14 d，此条件下食用收获期的马铃薯可靠安全。 |
| 关键词: 烯酰吗啉 马铃薯 气相色谱 农药残留动态 农药风险评估 |
| DOI： |
| 分类号: |
| 基金项目:农业部农药残留项目（2012H07） |
|
| Residual dynamics and risk assessment of dimethomorph in potato and soil |
|
LIANG Shuang,DUN Yanan,HOU Zhiguang,et al
|
| Abstract: |
| 【Objective】Residual dynamics of dimethomorph in potato and soil were investigated to provide basis for safe and reasonable application of pesticide to protect and cure Potato Late Bright.【Method】Firstly,a method was developed for analyzing dimethomorph residual based on gas chromatography.Then,field experiment was carried out in Shandong and Jilin during 2012 and 2013.Residual dynamics and final residues of dimethomorph in potato plant and soil were detected and the dietary risk was assessed.【Result】The half lives of dimethomrph in potato plant were 0.7 d (Jilin) and 0.6 d (Shandong) in 2012 and 2.5 d (Jilin) and 1.2 d (Shandong) in 2013.The half lives of dimethomrph in soil were 0.7 d (Jilin) and 0.5 d (Shandong) in 2012 and 4.3 d (Jilin) and 9.6 d (Shandong) in 2013.The final residues of dimethomorph at different dosages and different sprayed times in root and plant of potato and soil were different.The final residues in potato plant were lower than 1.240 mg/kg and that in soil were lower than 3.405 mg/kg.The final residues in potato tuber were less than 0.02 mg/kg (LOQ),which is lower than the MRL of 0.05 mg/kg.The exposure level of potato root in harvest season was 1.64×10-5 mg/kg and the risk quotient was 8.18×10-5 (much less than 1),indicating it is in safe level.【Conclusion】The suggested usage is 450 g/hm2 for 50% dimethomorph WP,no more than three times,7 d interval,and 14 d harvest safety interval for dietary safety. |
| Key words: dimethomorph potato gas chromatography pesticide residual dynamics pesticide risk assessment |
