Total Mercury Analyzer for Water with Gold Amalgamation

What is the Total Mercury Analyzer for Water with Gold Amalgamation?

A total mercury analyzer for water combines oxidation, reduction, gold amalgamation and detection to measure total mercury in water automatically. It is chosen for routine water monitoring with low detection limits and high sample throughput.

Overview

This benchtop analyzer automates the full method for water: sample and reagents are mixed and heated to oxidize all mercury species, the digest is reduced to elemental mercury, and the vapor is purged onto a gold trap. The trap is heated and mercury is detected by cold vapor atomic absorption or fluorescence. Because oxidation converts organomercury compounds and particulate mercury into a measurable form, the result is total mercury rather than only dissolved elemental mercury. Autosamplers handle sample series, and calibration uses aqueous standards or a gas-phase generator. Detection limits range roughly from 0.5 to 5 nanograms per litre depending on the detector and sample volume. The instrument is used for drinking water, wastewater, surface water and seawater monitoring under methods such as US EPA Method 1631 and ISO 12846.

How does it work?

Mercury is unique among metals because it is volatile at room temperature and forms a stable amalgam with gold. Most analyzers exploit one or both properties. In cold vapor atomic absorption, mercury in solution is reduced to elemental form with tin chloride or sodium borohydride and swept into an absorption cell where it absorbs the 253.7 nanometre line of a mercury lamp. Cold vapor atomic fluorescence uses the same generation step but detects emitted light at right angles for higher sensitivity. Direct analyzers heat the solid or liquid sample to release mercury, which is collected on a gold amalgamator, then desorbed into a detector. Ambient air and emission monitors use gold amalgamation or optical techniques such as Zeeman atomic absorption or ultraviolet absorption for continuous measurement. Calibration uses certified mercury standards and gas-phase generators, and all systems require careful control of contamination because mercury is ubiquitous in laboratories.

What are the key features?

• Automated oxidation, reduction and amalgamation
• Total mercury including organomercury species
• Gold trap concentration for low detection limits
• Cold vapor atomic absorption or fluorescence detector
• Autosampler for sample series
• Aqueous or gas-phase calibration

What are the technical specifications?

A typical total mercury analyzer for water with gold amalgamation configuration offers detection limit of 0.5–5 ng/L, measurement range of 1–1000 ng/L, sample volume of 10–100 mL, oxidation of bromine chloride or UV oxidation, amalgamation of gold trap and detector of cold vapor AAS or AFS. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Total Mercury Analyzer for Water with Gold Amalgamation is used in drinking water and regulatory compliance testing, wastewater and industrial effluent monitoring, surface water, groundwater and seawater and environmental research on mercury cycling. Across the wider Mercury Analyzers class, laboratories also deploy it for mercury in fish, rice, seafood and food products, drinking water, wastewater and seawater monitoring and soil, sediment and contaminated site assessment.

Which standards and certifications apply?

Relevant standards and methods include US EPA Method 7473 Mercury in solids and solutions by thermal decomposition, US EPA Method 7470A Mercury in liquid waste by cold vapor AAS, US EPA Method 1631 Mercury in water by oxidation, purge and trap, and CVAFS, ISO 12846 Water quality — Determination of mercury by AAS after enrichment, ISO 20552 Workplace air — Determination of mercury vapour by gold amalgamation, EN 15852 Stationary source emissions — Determination of total gaseous mercury and IEC 61010-1. Certification candidates for this model are CE, ISO 9001 manufacturing and 21 CFR Part 11 software compliance; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Mercury is toxic by inhalation and accumulates, so laboratories must control vapor exposure, use ventilated enclosures and monitor ambient air. Contamination is a constant risk because mercury appears in reagents, dust and previous samples, so ultrapure reagents, dedicated glassware and rigorous blanks are essential. Gold amalgamators require periodic cleaning or replacement when recovery falls. Calibration standards and gas generators must be traceable, and reducing agents must be fresh. Luminaires and detectors for the 253.7 nanometre line need stable temperature. For emission and ambient monitors, sample lines must be heated and inert to prevent mercury loss. Maintain service records and follow local occupational exposure limits and waste disposal rules.

How do I select the right Total Mercury Analyzer for Water with Gold Amalgamation?

Select a total mercury water analyzer when automated, low-level mercury measurement of many water samples is required and organomercury species must be included. Specify the detection limit, sample volume and expected sample numbers. Confirm that the oxidation chemistry suits your matrices and that the method matches the regulatory procedure you must follow.

How does it compare with other Mercury Analyzers variants?

Select a mercury analyzer by sample type and required detection limit. Direct thermal decomposition analyzers handle solid and liquid samples in minutes with minimal preparation and reach low nanogram levels, which suits food, soil and waste testing. Cold vapor atomic absorption is a robust, economical choice for water and digested samples at microgram per litre levels. Cold vapor atomic fluorescence reaches much lower limits and suits ultratrace water and seawater work. Portable ambient air analyzers with gold film or Zeeman detection serve workplace and indoor air surveys. Continuous emission monitors and total mercury analyzers with gold amalgamation are installed on industrial stacks and process streams. Confirm the measurement range, sample throughput, calibration approach and whether a specific regulatory method is mandated.