Abstract: 【Objective】 This study was aimed to analyze the contents of pesticide residues,heavy metal pollutants and aflatoxin B₁ (AFB₁) in cotton straw from the six major cotton producing areas in Xinjiang,in order to fill in the problem of missing basic data such as pesticide residues when using cotton straw as feed.【Method】 In this experiment,one cotton field was randomly selected from each of six major cotton planting areas in Xinjiang,with three areas in the front,middle and back.Then set up five 1 m² sample plots in each area,all cotton straw in the sample plots was collected with a stubble height of 15 cm.The cotton straw samples were cut it into small pieces with pruning pliers,mixed well,and collected 1 kg of sample according to the quartering method.The contents of 58 pesticide residues,AFB₁,deoxynivalenol,fluorine and five heavy metal pollutants were detected.【Result】 Only 3,5,3,3,2 and 1 pesticide residues were detected in the samples collected from six major cotton producing areas in Xinjiang.Most registered pesticides were not detected as residues in cotton straw samples.The maximum residual content of fenvalerate,triazophos,chlorfenapyr,chlorpyrifos,fenpropathrin,pyraclostrobin,cypermethrin,malathion and acetamiprid in cotton straw samples were 0.150,0.190,0.087,0.210,0.043,0.058,0.024,0.014 and 0.015 mg/kg,respectively,which were lower than the limit value of rice in the food safety standard GB 2763―2021.Four heavy metal pollutants of Pd,Cd,Cr and As were detected in cotton straw samples,the maximum content were 0.428,2.400,0.180 and 1.090 mg/kg,respectively,which were lower than the limit values in hygienical standard for feed GB 13078―2017,and met the feed standards.AFB₁ and deoxynivalenol were not detected in cotton straw samples,and the maximum content of fluorine detected was 20.67 mg/kg,which were lower than the limit value in the feed standard.【Conclusion】 Cotton straw fitted the limits of pesticide residues,AFB₁,deoxynivalenol,fluoride and heavy metal pollutants in hygienical standard for feed GB 13078―2017,and could be safely used as roughage for herbivorous livestock.

Key words: cotton straw; feed; pesticide residues; heavy metal pollution; aflatoxin B₁(AFB₁); security