Trace and Heavy Metal Analyzers

On-Line, At-Line, Portable and Laboratory heavy / trace metal analysis with our state of the art analyser systems.  

contaminated land large


All our VA Analyser systems use solid state electrodes to perform voltammetry for the analysis of metals in solution and soil samples.

Our trace metal product range includes the portable / laboratory PDV6000ultra and the two on-line, continuous systems: the OVA5000 and OVA7000. These systems are robust and perfectly suited to the harsh African environment. The systems can be operated by technicians in the field and laboratory, and is relatively low maintenance.  The portable, laboratory and online systems have a worldwide reputation for quality, reliability and ease of use, enabling customers to monitor pollutant levels, optimise their processes, minimise damage to the environment and protect the health of employees and communities at large.

Applications include: 

  • Academic research
  • Monitoring at remote locations
  • Contaminated land remediation
  • Food and feed analysis
  • Tracing contamination back to source
  • Accidental contamination events
  • Monitoring of rivers, lakes, reservoirs, seawater
  • Industrial effluent monitoring
  • Groundwater monitoring/natural attenuation
  • Wastewater recycling and WWTP influent monitoring
  • Drinking water intake and distribution


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Automated Trace Metal Monitoring - OVA7000


Fully Automated On-Line monitoring is possible with our OVA7000, OVA7000 Dual Cell and OVA5000 Trace / Heavy Metal Analyser systems.  These fully automated on-line metal monitors enables municipalities, industries and environmental agencies to continuously determine the levels of trace metals in process streams, effluent discharges, rivers and potable water.

The OVA7000 has a built in PC, which can be controlled by a computer connected via Wi-Fi or LAN.  This external control prevents unauthorised users from making any changes.  The Analyser system is housed in a modular cabinet with a seperate reagent cabinet.  

The OVA7000 Analyzer system runs on low power 12V DC (or standard 90 - 260V AC), making it the ideal solution for remote locations.


Process Explained

In Voltammetry metals are drawn onto the working electrode when a specific voltage is applied to the water sample under test.  

When a stripping voltage is applied, the metals return to the sample solution, generating a small current.  Eash metal has a specific voltage at which it returns to solution.  So the metal is identified by its stripping boltage and the current generated indicates the concentration of metal in the sample.     

VA explained  


Limits of Detection


Metal Name


Ag Silver 5 μg/L
As (III) Arsenic (III) 10 μg/L
As (Total) Arsenic μg/L
Au Gold μg/L
Cd Cadmium 0.5 μg/L
Co Cobalt 10 μg/L
Cr (VI) Chromium (VI) 10 μg/L
Cr (Total) Total Chromium 10 μg/L
Cu Copper μg/L
Fe Iron 10 μg/L
 Hg Mercury
0.5 μg/L
Manganese μg/L
Mo Molybdenum μg/L
Ni Nickel μg/L
Pb Lead μg/L
Pd Palladium μg/L
Sb (III) Antimony (III) μg/L
Se (IV) Selenium (IV) 10 μg/L
Sn Tin μg/L
Te Tellurium 10 μg/L
Tl Thallium μg/L
U Uranium μg/L
Zn Zinc μg/L




Measuring trace and heavy metals in water, soil and food has always been a vital part of modern environmental monitoring.

Voltammetry offers an internationally accepted alternative to laboratory analysis or automatic samplers. Modern Water’s PDV6000 ULTRA provides better on-site characterisation, with pollution hot spots and contamination sources more easily identified.

Modern Water’s tried and tested metal monitors have been market leaders for over twenty years. They provide an easy way to generate and store real-time data, which allows real-time decision-making. Our PDV6000 ultra can be more cost-effective than laboratory analysis and it can be used “stand-alone” or on a computer with our powerful VAS software.

Key Features: 

  • Multiple, sequential metal analysis when using VAS
  • AC or rechargeable battery for onsite use
  • Pre-treatment methods of acid/UV digest to eliminate interferences
  • Solid-state robust electrodes and stand provided
  • Detection limits below 1ppb, (depending on sample)
  • Report generation capability with VAS software.




Compact easy-to-use bench top digester.

Modern Water’s UVI 4000 digester is ideal for aqueous samples with slight to medium contamination from organic material. The unit provides aquick and easy way to remove this interference to achieve more accurate sample analysis. The UVI 4000 is a compact, bench-top device whichneeds no special set-up or protective arrangements to use.

Key features: 

  • Small footprint
  • Bench-top design (no need for protective glasses or fume cupboard)
  • Easy to run - simple five set up button
  • Direct sample input/ output
  • USB link to computer running Windows
  • Dynamic updating display


web UVI4000

Typical limits of detection for PDV and OVA monitors


Metal Name

PDV (portable analyser)

OVA (on-line analyser)

Ag Silver 0.5μg/l 5μg/l
As(III) Arsenic (III) 0.5μg/l 2μg/l
As(total) Arsenic 0.5μg/l 2μg/l
Au Gold 2μg/l  5μg/l
Bi Bismuth 2μg/l -
Cd Cadmium 0.5μg/l 0.5μg/l
Co Cobalt 10μg/l(1*) 10μg/l
Cr(VI) Chromium (VI) 5μg/l 10μg/l
Cr(total) Chromium  1μg/l 10μg/l
Cu Copper 0.5μg/l 1μg/l
Fe Iron 5μg/l 10μg/l
Hg Mercury 0.1μg/l 0.5μg/l
Mn Manganese 2μg/l 5μg/l
Mo Molybdenum 1μg/l* 1μg/l
Ni Nickel 5μg/l 2μg/l
Pb Lead 0.5μg/l 1μg/l
Pd Palladium 5μg/l 5μg/l
Sb(III) Antimony (III) 5μg/l 5μg/l
Se(IV) Selenium (IV) 5μg/l 10μg/l
Sn Tin 5μg/l 5μg/l
Te Tellurium 10μg/l 10μg/l
TI Thallium 2μg/l 0.5μg/l
U Uranium 1μg/l* 5μg/l
Zn Zinc 0.5μg/l 10μg/l

Limits vary with sample type. Typical clean water values are shown.

* using the LabCell method

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