Feral swine cause approximately $1.5 billion in damages to crops and property annually in the United States. Sodium nitrite is being used as a toxicant for population control efforts in Australia and New Zealand and is currently being investigated for registration in the United States. As part of the registration process, an analytical method to determine nitrite residues in feral swine tissues was developed.  Feral swine muscle and small intestine samples were cryogenically homogenized. 1.0 g of tissue was extracted with 10 mM potassium hydroxide with heat and agitation. The extracts were then cleaned up with chloroform and hexane. The cleaned up extracts were then diluted in 10 mM potassium hydroxide and analyzed via ion chromatography using conductivity detection. Recoveries of nitrite-fortified tissues (fortified at 10, 100, 1,000, and 10,000 µg/g) ranged between 90-100% for both matrices with relative standard deviations of 1.1-7.0%. The method successfully determined nitrite residues with detection limits of 3.8 µg/g for muscle and 4.6 µg/g for small intestine.

Determination of nitrite residues in feral swine tissues

2019 Fall National Meeting

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