How do Mercury Analyzers 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.
Which Mercury Analyzers variants are available?
- Direct Mercury Analyzer with Thermal Decomposition and Amalgamation — A direct mercury analyzer thermally decomposes solid or liquid samples and traps mercury on gold for atomic detection.
- Cold Vapor Atomic Absorption Mercury Analyzer — A cold vapor atomic absorption mercury analyzer reduces mercury in solution and measures its vapor by absorption.
- Cold Vapor Atomic Fluorescence Mercury Analyzer — A cold vapor atomic fluorescence mercury analyzer detects the fluorescence of mercury atoms after reduction and amalgamation.
- Portable Mercury Vapor Analyzer for Ambient Air — A portable mercury vapor analyzer measures mercury in ambient or workplace air with a battery-powered, handheld or field unit.
- Continuous Mercury Emission Monitoring System — A continuous mercury emission monitoring system measures mercury in industrial stack gas in real time.
- 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.
How do I choose the right variant?
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.
Where are Mercury Analyzers used?
Mercury Analyzers are specified in mercury in fish, rice, seafood and food products, drinking water, wastewater and seawater monitoring, soil, sediment and contaminated site assessment, workplace and indoor air mercury vapour surveys, industrial stack emission and process stream monitoring and geological and mining exploration samples.
Which standards and certifications apply?
Work with Mercury Analyzers is commonly governed by 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. Instrument certifications such as CE marking are confirmed per configuration and never assumed.
What are the key considerations before purchase?
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.
