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Molybdate 

​​​​Background

Molybdate is used as a corrosion inhibitor in recirculating cooling and boiler systems. Corrosion inhibitors produce a film on iron or steel surfaces which reduces the total surface area available to participate in corrosive reactions. Anodic corrosion inhibitors include chromate and zinc, but molybdate is considered to be more acceptable from an environmental perspective. The effectiveness of molybdate is often improved by use of this inhibitor in combination with organophosphorous or polyphosphate treatment programs.

Applied alone or as a corrosion inhibitor for mild steel, molybdate requires an initial concentration of 40-60 ppm, with a maintenance concentration of 5-20 ppm and pH at 7.5 or higher. Closed systems require even higher concentration, often 100-200 ppm.

Standard Analysis Techniques

Molybdenum is usually detected using atomic absorbance spectrometry for high accuracy analysis, but reagent based test kits are also available for field use. These kits are based on colorimetric analysis using mercaptoacetic acid reagent. Accuracy is poor at low
(1-3 ppm) concentration ranges and the method requires sample dilution for high (25 ppm and above) range analysis.

ChemScan Analysis Method

​Free molybdate has a unique absorbance signature in the ultraviolet wavelength range and can be accurately detected by ChemScan at low or high concentration without the use of reagents. If normal applied concentrations are maintained below 5 ppm, an expanded path length may be required for primary (no reagent) analysis.




Applied Spectrometry Associates, Inc.
2325 Parklawn Dr., Suite I, Waukesha, WI 53186
​Phone: 262-717-9500
Toll Free: 800-665-7133

Contact Us

  • Home
  • Applications
    • Municipal Water Monitoring >
      • Ammonia Feed
      • Chloramination Control
      • Chlorination
      • Color Analysis
      • Distribution Monitoring
      • Hardness Monitoring
      • Ion Exchange Breakthrough
      • Natural Organic Matter (NOM) Removal
      • Peak Point Chloramination Control
      • Phosphate Sequesterant Feed Control
      • Reservoir Monitoring
      • Security Monitoring
      • TOC Monitoring
      • 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
  • Service
    • Contact Service
    • 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
    • Representatives and Distributors
  • Products
    • ChemScan Mini Analyzer >
      • mini oP (Ortho Phosphate)
      • mini oP (Ortho Phosphate) Extended Range
      • mini LoP (Low Ortho Phosphate)
      • mini UV-254
      • mini LowAm (Low Ammonia)
      • mini Mn (Manganese)
      • mini LowChlor (Low Chlorine)
      • mini Sulfite
      • mini Mono (Monochloramine)
      • mini FreeAm (Free Ammonia)
      • mini Cu (Copper)
      • mini CrVI
      • mini Low CrVI
      • mini Fe (Iron)
      • mini Ni (Nickel)
      • mini Silica
    • 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 Alkalinity Analyzer >
      • For Wastewater
      • For Water
    • ChemScan Accessories