Walker John T, Robarge Wayne P, Shendrikar Arun, Kimball Hoke
U.S. Environmental Protection Agency, National Risk Management Research Laboratory, Air Pollution Prevention and Control Division, Mail Drop E305-02, 109 T.W. Alexander Drive, Research Triangle Park, NC 27711, USA.
Environ Pollut. 2006 Jan;139(2):258-71. doi: 10.1016/j.envpol.2005.05.019. Epub 2005 Aug 2.
In this study, we present approximately two years (January 1999-December 2000) of atmospheric NH3, NH4+, HCl, Cl-, HNO3, NO3-, SO2, and SO4= concentrations measured by the annular denuder/filter pack method at an agricultural site in eastern North Carolina. This site is influenced by high NH3 emissions from animal production and fertilizer use in the surrounding area and neighboring counties. The two-year mean NH3 concentration is 5.6 (+/-5.13) microg m(-3). The mean concentration of total inorganic PM2.5, which includes SO4=, NO3-, NH4+, and Cl-, is 8.0 (+/-5.84) microg m(-3). SO4=, NO3-, NH4+, and Cl- represent, respectively, 53, 24, 22, and 1% of measured inorganic PM2.5. NH3 contributes 72% of total NH3 + NH4+, on an average. Equilibrium modeling of the gas+aerosol NH3/H2SO4/HNO3 system shows that inorganic PM2.5 is more sensitive to reductions in gas + aerosol concentrations of sulfate and nitrate relative to NH3.
在本研究中，我们展示了通过环形扩散管/滤膜组方法在北卡罗来纳州东部一个农业地点测得的约两年（1999年1月 - 2000年12月）的大气中NH3、NH4+、HCl、Cl-、HNO3、NO3-、SO2和SO4=的浓度。该地点受到周边地区和邻近县动物养殖及肥料使用产生的高NH3排放的影响。两年的平均NH3浓度为5.6（±5.13）μg m(-3)。包括SO4=、NO3-、NH4+和Cl-在内的总无机PM2.5的平均浓度为8.0（±5.84）μg m(-3)。SO4=、NO3-、NH4+和Cl-分别占测得的无机PM2.5的53%、24%、22%和1%。平均而言，NH3占总NH3 + NH4+的72%。气 - 气溶胶NH3/H2SO4/HNO3系统的平衡模型表明，相对于NH3，无机PM2.5对硫酸盐和气态 + 气溶胶硝酸盐浓度的降低更为敏感。
