SN/T 5444-2022 in English

Technical Background and Standard Value

Prochloraz is widely used as a broad-spectrum fungicide in agricultural production, and its metabolites BTS44595, BTS44596 and BTS45186 also have biological activity. This standard establishes a detection method with a sensitivity of 0.01mg/kg in response to the increasingly stringent pesticide residue limit requirements in international trade, providing technical support for ensuring the compliance of exported food.

Core Innovation of the Method

Analysis of key operation points

Implementation recommendations

1. Quality control: Each batch of samples should be subjected to a blank test and spike recovery test (recommended addition level 0.01-2.0 mg/kg)
2. Equipment calibration: The ion abundance ratio should be verified with a matrix-matched standard solution before daily analysis (refer to Table 3 for deviation requirements)
3. Data report: When the result is less than 0.1 mg/kg, retain four decimal places; when it is greater than or equal to 0.1 mg/kg, retain three significant figures

Technology evolution analysis

Compared with the SN/T 2325-2009 version of the method, the progress of this standard is reflected in:
① The introduction of graphitized carbon black-amino composite column purification technology increases the recovery rate to 75-109%;
② The total amount of metabolites can be converted through the conversion coefficient (1.157-1.908), which is more in line with international regulatory trends.