title: Determinatlon of nitrate ion at the part per billion level in environmental samples with a continuous flow immobilized enzyme reaction.
mesh_terms: D004785:Environmental Pollutants / Q000032:analysis; D007202:Indicators and Reagents; D008722:Methods; D008832:Microchemistry; D009565:Nitrate Reductases; D009566:Nitrates / Q000032:analysis*
chemical_list: D004785:Environmental Pollutants; D007202:Indicators and Reagents; D009566:Nitrates; D009565:Nitrate Reductases