title: A simple microdiffusion method for estimating nitrate (and ammonia) in agricultural and environmental surveys.
mesh_terms: D000641:Ammonia / Q000032:analysis*; D003124:Colorimetry / Q000379:methods*; D004058:Diffusion; D009566:Nitrates / Q000032:analysis*; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D014873:Water Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D012989:Soil Pollutants; D014873:Water Pollutants; D014874:Water Pollutants, Chemical; D000641:Ammonia