Occurrence of ectoparasiticides in Australian beef cattle feedlot wastes
Journal article, 2013

A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the simultaneous analysis of 6 ectoparasiticides - 2 synthetic pyrethroids (deltamethrin, cypermethrin) and 4 macrocyclic lactones (abamectin, doramectin, ivermectin and eprinomectin) in biosolids. The method was used to investigate the occurrence of these ectoparasiticides in beef cattle feedlot wastes in Australia from 5 commercial feedlot operations which employ varying waste management practices. Deltamethrin and cypermethrin were not detected in any of the samples while abamectin, ivermectin, doramectin and eprinomectin were detected in some of the samples with concentrations ranging from 1 to 36 mu g/kg dry weight (d.w.) freeze dried feedlot waste. Levels of macrocyclic lactones detected in the feedlot wastes varied and were dependent on sample type. The effect of seasonal variations and waste management practices were also investigated in this study.

Macrocyclic lactones

induced fluorometry derivatization


performance liquid-chromatography



sheep feces


synthetic pyrethroids

Feedlot waste

solid-phase extraction




chromatography mass-spectrometry

fluorescence detection


H. M. Coleman

University of New South Wales (UNSW)

T. Trinh

University of New South Wales (UNSW)

N. Le-Minh

University of New South Wales (UNSW)

M. Klein

University of New South Wales (UNSW)

D. J. Roser

University of New South Wales (UNSW)

R. W. Tucker

Feedlot Services Australia

RM Stuetz

University of New South Wales (UNSW)

Gregory Peters

Chalmers, Chemical and Biological Engineering, Chemical Environmental Science

Stuart Khan

University of New South Wales (UNSW)

Environmental Pollution

0269-7491 (ISSN) 1873-6424 (eISSN)

Vol. 174 265-272

Subject Categories

Environmental Engineering

Earth and Related Environmental Sciences



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