This certificate is designed in accordance with ISO 17034 and ISO Guide 31. This reference material (RM) was designed,produced and verified in accordance with ISO/IEC 17025, ISO 17034 and a registered quality management system ISO 9001.

1.Dicofol (CAS No. : 115-32-2) has two peaks,the retention times are 4.641min and 9.946min.三氯殺螨醇(CAS No. : 115-32-2) 出兩個峰，保留時間分別為4.641min和9.946min。
2.The retention times of Fenpropathrin (CAS No. : 39515-41-8) is 9.946min.甲氰菊酯(CAS No. : 39515-41-8)保留時間是9.946分鐘。
3.Cyfluthrin (CAS No. : 68359-37-5) has four peaks,the retention times are 13.659min,13.829min,13.967min and 14.035min.氟氯菊酯 (CAS No. : 68359-37-5) 出4個峰，保留時間分別為13.659min、13.829min、13.967min和14.035min。
4.Cypermethrin (CAS No. : 52315-07-8) has four peaks,the retention times are 14.203min,14.384min,14.512min and 14.585min.氯氰菊酯(CAS No. : 52315-07-8) 出4個峰，保留時間分別為14.203min、14.384min、14.512min和14.585min。
5.Fenvalerate (CAS No. : 51630-58-1) has two peaks,the retention times are 15.845min and 16.215min.氰戊酸酯(CAS No. : 51630-58-1) 出兩個峰，保留時間分別為15.845min和16.215min。

This RM is intended for use in a laboratory as a calibration and quality control standard or in method development for analytical techniques.

The certified value(s) and uncertainty(ies) are determined in accordance with ISO 17034 with an 95% confidence level (k=2). Uncertainty is based on the Total Combined Uncertainty, including uncertainties of preparation, purity of neat materials, homogeneity, stability testing.

The balances used for gravimetric measurements are calibrated with weights traceable to the national standards. The calibration of the balances is verified annually by an external accredited calibration service. This analysis method has been verified using an approach consistent with ISO 17034:2016 & ISO 17025:2017.

Random replicate samples of the final packaged RM have been analysed to prove homogeneity consistent with ISO 17034.

The RM should be stored in the original sealed bottle at the indicated temperature.