TY - JOUR
T1 - Nitrous oxide supersaturation at the liquid/air interface of animal waste
AU - Makris, Konstantinos C.
AU - Andra, Syam S.
AU - Hardy, Michael
AU - Sarkar, Dibyendu
AU - Datta, Rupali
AU - Bach, Stephan B.H.
AU - Mullens, Conor P.
PY - 2009/12
Y1 - 2009/12
N2 - Concentrated animal feeding operations around the globe generate large amounts of nitrous oxide (N 2O) in the surrounding atmosphere. Liquid animal waste systems have received little attention with respect to N 2O emissions. We hypothesized that the solution chemistry of animal waste aqueous suspensions would promote conditions that lead to N 2O supersaturation at the liquid/air interface. The concentration of dissolved N 2O in poultry litter (PL) aqueous suspensions at 25 °C was 0.36 μg N 2O mL -1, at least an order of magnitude greater than that measured in water in equilibrium with ambient air, suggesting N 2O supersaturation. There was a nonlinear increase in the N 2O Henry constants of PL from 2810 atm/mole fraction at 35 °C to 17 300 atm/mole fraction at 41 °C. The extremely high N 2O Henry constants were partially ascribed to N 2O complexation with aromatic moieties. Complexed N 2O structures were unstable at temperatures > 35 °C, supplying the headspace with additional free N 2O concentrations.
AB - Concentrated animal feeding operations around the globe generate large amounts of nitrous oxide (N 2O) in the surrounding atmosphere. Liquid animal waste systems have received little attention with respect to N 2O emissions. We hypothesized that the solution chemistry of animal waste aqueous suspensions would promote conditions that lead to N 2O supersaturation at the liquid/air interface. The concentration of dissolved N 2O in poultry litter (PL) aqueous suspensions at 25 °C was 0.36 μg N 2O mL -1, at least an order of magnitude greater than that measured in water in equilibrium with ambient air, suggesting N 2O supersaturation. There was a nonlinear increase in the N 2O Henry constants of PL from 2810 atm/mole fraction at 35 °C to 17 300 atm/mole fraction at 41 °C. The extremely high N 2O Henry constants were partially ascribed to N 2O complexation with aromatic moieties. Complexed N 2O structures were unstable at temperatures > 35 °C, supplying the headspace with additional free N 2O concentrations.
KW - Animal waste
KW - Henry constant
KW - Lagoons
KW - Liquid/air interface
KW - Nitrous oxide
KW - Supersaturation
UR - https://www.scopus.com/pages/publications/74349129976
UR - https://www.scopus.com/inward/citedby.url?scp=74349129976&partnerID=8YFLogxK
U2 - 10.1016/j.envpol.2009.06.006
DO - 10.1016/j.envpol.2009.06.006
M3 - Article
C2 - 19573962
AN - SCOPUS:74349129976
SN - 0269-7491
VL - 157
SP - 3508
EP - 3513
JO - Environmental Pollution
JF - Environmental Pollution
IS - 12
ER -