• MA: Direct thermal decomposition mercury analyzer
  • PE: Fully automated petro-pyrolysis mercury analyzer
  • RA: Reducing-vaporization mercury analyzer
  • RA-4500
  • RA-4300
  • RA-4300FG+
  • RA-5A
  • WA: Atmospheric mercury analyzer
  • EMP: Portable mercury survey meter

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Reducing-vaporization mercury analyzer: RA series

Reducing-vaporization mercury analyzer

RA series

Model name of RA series

Fully automated reducing-vaporization mercury analyzer: RA-4500Reducing-vaporization mercury analyzer: RA-4300
Reducing-vaporization mercury analyzer: RA-4300FG+Reducing-vaporization mercury analyzer: RA-5


The RA series is the equipment that adopts the reducing-vaporization method and is intended to measure and analyze the mercury concentration in liquid samples, with higher sensitivity, higher accuracy, and higher efficiency.

We have a wide variety of lineup to meet your needs, and now readily respond to your request for upgrade of your equipment you purchased from us.

We offer a wide variety of line up, from the model that has only the detector intended for manual measurement, to the high-end flagship model that fully automates the troublesome wet pretreatment process that can contains up to 10 steps.


The typical measuring samples include tap water, drinking water, industrial wastewater, river water, lake water, rainwater, and soil (eluate and content). The RA series can also measure samples of flue gas absorbents, sediments, foods, organisms in pretreated sample water and medicines.

Measurement flow

Measuring samples contain mercury compounds that were converted beforehand into the divalent mercury ion (Hg2+) form by wet pretreatment (refer to standards such as JISK0102 Testing methods for industrial wastewater). When Tin (II) Chloride solution is added to this wet-pretreated sample, divalent mercury ion (Hg2+) is reduced into zero-valent metal mercury, and, by being exposed to flowing gas, metal mercury turns into mercury gas.

After the acid mist and water vapor that are generated while the sample is being exposed to flowing gas is removed by using the electronic cooling unit, absorbance of 253.7 nm, which is the absorption wave length for mercury, is measured.

(In the RA series, in addition to models using cold-vapor atomic absorption spectrometry, ultra-high sensitivity models using atomic fluorescence spectroscopy are available.)

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