Key Caboratory of Chinese Ministry of Education of northwest Water Resource and Environmental ecolog School of environmental and Municipal Engineering 声建墨群骨 xi'an University of Architecture and Technology Nitrate and Nitrite 2.0 1.0 NO,-N 0.5 0.0 0369121518212427 ampling Nunmber r Organic and inorganic nitrogen 80 600 7 Inorganic average 68.5% Organic average: 31.5%Key Laboratory of Chinese Ministry of Education of Northwest Water Resource and Environmental Ecology School of Environmental and Municipal Engineering Xi’an University of Architecture and Technology