GB/T 22259-2025: Determination of oxytetracycline in feeds

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Scope

This document describes methods for the determination of oxytetracycline in feeds
using liquid chromatography-tandem mass spectrometry and high-performance liquid
chromatography.
This document is applicable to the determination of oxytetracycline in compound feeds,
concentrate feeds, concentrate supplements, premixes, feed ingredients, and mixed feed
additives.
In this document, the detection limit for the liquid chromatography-tandem mass
spectrometry method is 0.02 mg/kg, and the quantification limit is 0.05 mg/kg. For the
high-performance liquid chromatography method, the detection limit for compound
feeds (excluding aquatic compound feeds), concentrate feeds, concentrate supplements,
and feed ingredients is 1.0 mg/kg, with a quantification limit of 2.0 mg/kg; for aquatic
compound feeds, the detection limit is 5.0 mg/kg, with a quantification limit of 10.0
mg/kg; and for additive premixes and mixed-type feed additives, the detection limit is
2.5 mg/kg, with a quantification limit of 5.0 mg/kg.

Basic Data

Standard ID	GB/T 22259-2025 (GB/T22259-2025)
Description (Translated English)	Determination of oxytetracycline in feeds
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	B46
Classification of International Standard	65.120
Word Count Estimation	14,119
Date of Issue	2025-08-01
Date of Implementation	2026-02-01
Older Standard (superseded by this standard)	GB/T 22259-2008
Issuing agency(ies)	State Administration for Market Regulation, Standardization Administration of China