To promote exports, import tolerance (IT) of thiacloprid in strawberry was proposed using the Organization for Economic Cooperation and Development (OECD) maximum residue limit (MRL) calculator after conducting three different field trials. The pre‐harvest interval of residual pattern and degradation dynamics of thiacloprid in strawberry were determined using ultra‐performance liquid chromatography–tandem mass spectrometry. Samples were extracted with acetonitrile and a mixture of salts and dilution was performed for purification. A six‐point matrix‐matched calibration curve was constructed which provided excellent linearity with coefficient of determination (R²) of 0.9998 or more. Detection and quantification limits were 0.003 and 0.01 mg/kg, respectively. The method was validated in quintuplicate at three different concentrations, which resulted in acceptable recovery ranging from 80.86% to 101.71% with relative standard deviation of 6.50 or less among the three field sites. The developed method was applied to the field‐treated sample harvested at different intervals. In the pre‐harvest interval trial, the amount of thiacloprid residues ranged from 0.24 to 0.70 mg/kg in field site 1 (Nonsan), 0.16 to 0.50 mg/kg in field site 2 (Sunchang), and 0.36 to 0.50 mg/kg in field site 3 (Sacheon). By contrast, in the degradation trial, the observed residues were 0.03–0.81 mg/kg in field site 1 and 0.02–0.48 mg/kg in field site 2. Consequently, the IT of thiacloprid in strawberry using the OECD MRL calculator was proposed as 2 mg/kg, which is exactly the same as the MRL established by the Republic of Korea. In conclusion, the residue study proposes 2.0 mg/kg as the MRL of thiacloprid in strawberries.

中文翻译：

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建立杀虫剂噻虫啉在草莓中的进口耐受性

为了促进出口，在进行了三个不同的田间试验后，使用经济合作与发展组织（OECD）的最大残留限量（MRL）计算器提出了草莓中噻虫啉的进口耐受性（IT）。使用超高效液相色谱-串联质谱法测定草莓中残留的残留模式和噻虫啉的降解动力学。样品用乙腈萃取，混合盐和稀释液进行纯化。构建了六点矩阵匹配的校准曲线，该曲线提供了出色的线性和测定系数（R ²）等于或大于0.9998。检测限和定量限分别为0.003和0.01 mg / kg。该方法以三种不同浓度一式五份进行了验证，在三个现场之间的相对标准偏差为6.50或更小，结果回收率在80.86％至101.71％之间。所开发的方法适用于以不同间隔收获的野外处理样品。在收获前间隔试验中，田间场所1（日产）的噻虫啉残留量范围为0.24至0.70 mg / kg，田间场所2（Sunchang）的范围为0.16至0.50 mg / kg，0.36至0.50 mg / kg在实地3（Sacheon）中。相比之下，在降解试验中，现场1观察到的残留量为0.03-0.81 mg / kg，现场2观察到的残留量为0.02-0.48 mg / kg。建议使用OECD MRL计算器计算草莓中噻虫啉的IT含量为2 mg / kg，这与大韩民国制定的MRL完全相同。总之，残留量研究建议将2.0 mg / kg作为草莓中噻虫啉的最大残留限量。