Control of emission of gases such as ammonia (NH3), hydrogen sulfide (H2S), carbon dioxide (CO2) and methane (CH4) is a major concern for large-scale swine producers. The use of chemical amendments is a possible method for controlling these emissions. A study was conducted by applying three chemical amendments (aluminium sulfate (alum), aluminium chloride (AlCl3), and ferric chloride (FeCl3)) to swine manure in a controlled environment for a 6-d incubation period. Gaseous emissions and changes in manure composition were monitored. The results showed no significant differences in NH3-N concentrations in the manure. Total Kjeldahl concentrations in the manure were significantly different between the raw manure and alum treatment. Emissions of NH3 were affected by chemical amendment, with alum producing lower NH3 concentrations. Emission concentrations of NH3 and CO2 demonstrated periodic behaviour, presumably due to stirring the manure prior to sample collection.