CHEMSCAN
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      • mini ChlorAm
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    • ChemScan Process Analyzers with HMI >
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Chloramines

Picture
Interactions between chlorine and various forms of nitrogen found in or intentionally added to water are complex and successive (but reversible) in nature, governed by the ratio of chlorine to nitrogen and by pH and reaction time. As the chlorine to nitrogen ratio increases, the combined species transform first into monochloramine, then into dichloramine, then trichloramine and finally into free chlorine plus nitrogen gas. The typical reactions are as follows:

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​ChemScan Analysis Methods

Monochloramine can be analyzed by direct spectrophotometric methods or by photometric measurement of the amount of iodine liberated from potassium iodide reagent under neutral pH conditions. (See ChemScan Method Summary #122, Monochloramine). If after analysis of monochloramine in a sample, the pH is subsequently lowered to below 4 and more potassium iodide added to the sample, the concentrations of the monochloramine plus higher forms of chloramine (di- and tri-chloramine) can be obtained after specific time intervals. Control of analysis time intervals and pH will allow each individual form of chloramine to be analyzed if desired. In practice, most control applications are operated to maximize the monochloramine concentration and avoid any formation of higher chloramine species, which tend to have objectionable taste and odor. (See ChemScan Application Summary #154, Peak Point™ Chloramination Control.)

ChemScan, Inc.
2325 Parklawn Dr., Suite I, Waukesha, Wisconsin, USA 53186
​Phone: 262-717-9500
Toll Free: 800-665-7133
  • Applications
    • Municipal Water Monitoring >
      • Ammonia Feed
      • Chloramination Control
      • Chlorination
      • Color Analysis
      • Distribution Monitoring
      • Ion Exchange Breakthrough
      • Natural Organic Matter (NOM) Removal
      • Peak Point Chloramination Control
      • Phosphate Sequesterant Feed Control
      • Reservoir Monitoring
      • Security Monitoring
      • TOC Monitoring in Water
      • Well Blending
    • Wastewater Monitoring and Control >
      • Aeration Control and Energy Cost Reduction
      • Biological Nutrient Removal
      • Biological Phosphorus Removal
      • Chemical Phosphorus Removal
      • Chloramination /Breakpoint Avoidance
      • Chlorination/De-Chlorination
      • De-Nitrification Monitoring
      • Nitrification
      • Nutrient Deficiency Analysis
      • Lagoon Discharge
      • SBR Stage Control
      • TOC Monitoring
      • UV Disinfection Control
    • Industrial Water Treatment >
      • Boiler Water Analysis
      • Cooling Water Analysis (Closed Loop)
    • Industrial Process Monitoring >
      • Electroless Plating
    • ASA Technical Papers (ALL)
    • ChemScan Installation Photos
    • Success Stories
    • ChemScan Webinars
  • Service
    • Contact Service Request Form
    • ChemScan Service Team
    • MSDS
    • Communication Protocols
    • Software Utilities
    • Service Videos
  • Parts
  • Company
    • Terms and Conditions
    • Contact Form (General Inquiry)
    • Contact Service
    • Application Data Sheet
    • Employment Opportunities
    • ChemScan Representatives and Distributors
  • Products
    • ChemScan Mini Analyzer >
      • mini oP (Ortho Phosphate)
      • mini oP (Ortho Phosphate) Extended Range
      • mini Cu (Copper)
      • mini LoP (Low Ortho Phosphate)
      • mini UV-254
      • mini LowAm (Low Ammonia)
      • mini Mn (Manganese)
      • mini LowMn (Low Manganese)
      • mini LowChlor (Low Chlorine)
      • mini Sulfite
      • mini Ammonia
      • mini FreeAm (Free Ammonia)
      • mini Fe (Iron)
      • mini Ni (Nickel)
      • mini PAA (Peracetic Acid)
      • mini ChlorAm
    • ChemScan mini Accessories
    • ChemScan Process Analyzers >
      • ChemScan 2150/S Chloramination Analyzer
      • ChemScan 2150/DC Chem Feed Analyzer
      • ChemScan 2150/N Aeration Rate Analyzer
      • ChemScan 2150/NoP Chem Feed Analyzer
      • ChemScan 2150/NHoP Nutrient Analyzer
      • ChemScan 2150 Process Analyzer
      • ChemScan UV-3150 Process Analyzer
      • ChemScan 4100 Nutrient Control
      • ChemScan 6101 Nutrient Control
    • ChemScan Process Analyzers with HMI >
      • ChemScan 2250/S HMI Chloramination Analyzer
      • ChemScan 4200 HMI Analyzer
      • ChemScan 3250 HMI Analyzer
      • ChemScan 2250/NoP HMI Analyzer
      • ChemScan 2250/NHoP HMI Analyzer
      • ChemScan 2250/N HMI Analyzer
      • ChemScan 2250 HMI Analyzer
      • ChemScan 6201 HMI Analyzer
    • ChemScan Analyzer Accessories
    • ChemScan Sensor Family