Water Analysis- Recommended Instruments

Both Discrete Analyzers & Continuous Segmented Flow Analyzers can be used for water chemistry analysis. The best instrument will depend on your daily & weekly sample throughput, space, number of analyses, automation level required and detection limits required. By selecting a water analyzer designed & manufactured by SEAL Analytical you're choosing an analyzer designed specifically for environmental laboratories & supported by over 50 years experience. All our analyzers offer USEPA, AOAC and ISO compatible methods. Please contact us to discuss your application.

Continuous Segmented Flow Analyzers

Water analyzers can be checking for contamination and water quality to help determine treatment optimization as well as analyzing water samples to verify health-based and aesthetic standards are being met. The automation of your water chemistry analysis will bring a previously unattainable level of sensitivity, speed and precision to your water analysis. All water analyzers are supplied with detailed method descriptions, including reagent make up, flow diagrams, and specific application notes.

Models Suitable for Water Analysis

  • AutoAnalyzer 100 (AA100)- Ideal for laboratories running 1 or 2 dedicated chemistries. Compact analyzer.
  • AutoAnalyzer 3 HR (AA3 HR)- Up to 100 samples/hour. Future proof, modular design.
  • AutoAnalyzer AA500- Full software control including automatic startup and complete automatic shutdown.
  • QuAAtro-  A microflow analyzer ideal for high throughput & ultra-low detection limits. 

Water Chemistry Analyzer Methods

  • SEAL has an extensive library of over 100 methods for water chemistry analysis.
  • USEPA, AOAC & ISO compatible methods available.
  • USEPA methodologies for automated colorimetric analysis reference the Technicon AutoAnalyzer II (this model has been replaced by the AutoAnalyzer 3).
  • Each method is multi-range, giving the ability to set up your desired range.
  • Dialyzers are sometimes used to stop any color interference and/or dilution.
  • Methods used with older AutoAnalyzer II and TrAAcs systems are completely transferable to current model AutoAnalyzers.

Multi-test manifolds


Typical Water Parameters

We have an extensive list of methods for water chemistry analysis. The list below is a partial list of the most common methods. Contact us for a complete list.

Alkalinity Ammonia (Salicylate) Ammonia (Phenate) Boron
Bromide Calcium Chloride Chromium
Copper Cyanide Fluoride Hardness
Iron (total & free) Iodide Magnesium Manganese
Nicotine Nitrate Nitrite Nitrogen, Total
Nitrogen, Total (Kjeldahl) Phenol Phosphate Phosphate (Molybdovanadate)
Phosphorous, Total (Kjeldahl) Potassium Silicate Sodium
Sulfide Zinc    



US EPA Approved Methods

AQ2 - USEPA Approved Methods


Discrete Analyzers

Discrete Analyzers make an ideal compact analyzer for the chemistry analysis of water.  SEAL has over 30 methods for environmental analysis covering the analytes important in water chemistry analysis.   

Discrete Analyzer Models

  • AQ2 Discrete Analyzer- Up to 180 tests/hour. Up to 7 tests on a single sample. Compact bench-top analyzer.
  • AQ270 Discrete Analyzer- Up to 180 tests/ hour. Up to 7 simultaneous chemistries. Up to 57 sample positions.
  • AQ300 Discrete Analyzer-Up to 180 tests/ hour. Up to 14 simultaneous chemistries. Up to 97 sample positions
  • AQ400 Discrete Analyzer- High capacity analyzer. Up to 216 tests in one run.  Up to 120 sample positions. Up to 30% lower detection limits

Water Chemistry Methods Using Discrete Analysis

  • Over 30 methods specifically for the environmental market.
  • Our stated detection limits will be achieved by typical laboratories. Many users exceed these detection limits.
  • We have individual letters of USEPA approval confirming our methods are acceptable for drinking water (NPDWR/NSDWR) compliance monitoring. 
  • UKAS methods applied to our Discrete Analyzers are traceable to methods published in the series "Methods for the Examination of Waters and Associated Materials", produced by the Standing Committee of Analysts in the UK. The methods are acceptable for drinking water according to criteria set by the UKAS (United Kingdom Accreditation Service) and the DWI (Drinking Water Inspectorate).
  • List of Discrete Analyzer methods.



UKAS Approved Methods

AQ2 - USEPA Approved Methods


UKAS Approved Methods

AQ2 - UKAS Approved Methods

UKAS - United Kingdom Accreditation Service

UK Drinking Water Inspectorate