Degradation and dissipation of the veterinary ionophore lasalocid in manure and soil. (November 2015)

• Record Type: Journal Article
• Authors: Žižek, Suzana; Dobeic, Martin; Pintarič, Štefan; Zidar, Primož; Kobal, Silvestra; Vidrih, Matej
• Is Part Of: Chemosphere. Volume 138(2015)
• Page Start: 947
• Page End: 951
• Publication Date: 2015-11
• Subjects: Lasalocid -- Degradation -- Dissipation -- Environmental risk assessment; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2014.12.032
• Languages: English
• ISSNs: 0045-6535

Abstract

Highlights: The fate of lasalocid in poultry manure and on arable land is largely unknown. We measured lasalocid degradation in manure and compost and dissipation on land. Degradation in compost is faster than in manure. Half-life of lasalocid in soil was 3.1 ± 0.6 d. PEC/PNEC in soil could exceed 1 in a worst-case scenario if manure is not aged. Abstract: Lasalocid is a veterinary ionophore antibiotic used for prevention and treatment of coccidiosis in poultry. It is excreted from the treated animals mostly in its active form and enters the environment with the use of contaminated manure on agricultural land. To properly assess the risk that lasalocid poses to the environment, it is necessary to know its environmental concentrations as well as the rates of its degradation in manure and dissipation in soil. These values are still largely unknown. A research was undertaken to ascertain the rate of lasalocid degradation in manure under different storage conditions (aging in a pile or composting) and on agricultural soil after using lasalocid-contaminated manure. The results have shown that there is considerable difference in lasalocid degradation between aging manure with no treatment ( t 1/2 = 61.8 ± 1.7 d) and composting ( t 1/2 = 17.5 ± 0.8 d). Half-lives in soil are much shorter (on average 3.1 ± 0.4 d). On the basis of the measured concentrations of lasalocid in soil after manure application, we can conclude that it can potentially be harmful to soil organisms (PEC/PNEC ratio of 1.18), but only in a worst-case scenario of using the maximum permissible amount of manure and immediately after application. To make certain that no harmful effects occur, composting is recommended.