Reducing-vaporization mercury analyzer
Reducing-vaporization CVAFS mercury analyzer with a built-in activated carbon filter, complies with global standards
Built-in activated carbon filter unit fr reducing external mercury influence
The RA-4300FG+ is reducing-vaporization mercury analyzer with ultra-high sensitivity that complies with global standards. This equipment uses gold amalgamation and atomic fluorescence spectroscopy.
The equipped activated carbon filter unit lowers mercury concentration of air inside the equipment, by which, external mercury influence, which poses a problem when analyzing mercury in the low concentration range, is reduced in the working environment. Additionally, reagents are purged by argon gas containing no mercury to minimize the reagent blank increase during analysis.
The RA-4300FG+ is equipped with evaluation software according to EPA1631E which specifies the gold amalgamation method, and to EPA245.7 which specifies the direct reducing-vaporization method so that you can confirm the reliability of the measurement.
By adding the reducing solution (Tin (II) Chloride) to the divalent mercury ion (Hg2+) in the sample solution, mercury is reduced into zero-valent atomic mercury. Then, by flowing gas, mercury is turned into vapor. Moisture is removed into the Nafion tube. The atomic mercury is concentrated as gold amalgam by the use of a gold-supported collector tube. After all mercury in the liquid sample is concentrated, the collector tube is heated to liberate mercury as atomic mercury which is sent to the detector. For detection, atomic fluorescence spectroscopy is used to perform highly sensitive mercury concentration measurement.
Bromine monochloride is dropped into the sample to decompose organic substances. Next, hydroxylammonium chloride solution is added to mask bromine chloride that obstructs mercury measurement. Then, Tin (II) Chloride solution is added.
This is a method to directly measure mercury after the pretreatment above without concentrating it in the collector tube.
Alkali reduction method
Sodium hydroxide solution and copper sulfate solution are added to the sample, and then Tin (II) Chloride solution is added. Total mercury can be easily measured.
You have other measurement options, including measurement that uses only sulfuric acid and Tin (II) Chloride solution without decomposing organic substances in the sample, or measurement that uses hydroxylammonium chloride solution and Tin (II) Chloride solution (gold amalgamation) after decomposing organic substances.
|Sample treatment section||Number of sample||80|
|Drive system||Turn table system|
|Sample container||Disposable glass tube|
|Bubbler||Reagent-resistance resin bubbler|
|Reagent dispenser section||Dispensing||Delivered with a tube pump|
|Dispensed reagents||BrCl or Sulfuric acid, Tin (II) chloride solution, Hydroxylamine hydrochloride solution, Distilled water|
|Mercury detecting section||Measurement principle||Cold vapor Atomic Fluorescence Spectroscopy|
|Measurement method||Reducing vaporization with open air-supply|
(Peak height measuring and integration measuring selectable)
|Light source||Low pressure mercury discharge lamp|
|Detection limit||0.25pg/5mL (0.05ppt) |
*0.5ppt in case of including EPA1631e digestion
|Maximum range||1,000ng/5mL (200ppb)|
|Mercury removal||Absorption by activated carbon|
|Flow monitor||Flow sensor|
|Data processing system |
|OS||Windows 7, 8|
|Communication||Ethernet (One-to-one for RA-4300, not for in-house LAN)|
|Display||Peak wave shape, Calibration curve, Measuring time and Measuring result|
|Control software||Start/stop measuring: Controllable, Reagent dispensing volume setup|
|Data processing software||EPA criteria report|
Selectable from 6 formulas (3 linear and 3 3rd Order fits), Correlation coefficient is automatically calculated.
Statistic calculation: Mean value, Standard deviation, Coefficient of variation (All values are automatically calculated.)
|Measuring conditions, Calibration curve, Measured values, Statistical calculations, Peak wave shape and Measuring time|
|Quality control||Check standard, Avoid abnormally high mercury etc.|
|Installation requirements||Installation dimensions||580W x 530D x 753H (mm) *With air clean unit|
|Power supply||(1) AC, single phase, 100V, 220~240V 50/60Hz |
(2) Voltage variation: within ±5%
(3) Power capacity: 0.24 kVA (Excluding PC and printer)
(4) Power quality: Non surging, no high-frequency waves, and noiseless.
(5) Distance from power supply: 2m or less
(6) Ground-fault circuit interrupter: 15mA
(7) Grounding: Grounding terminal with ground resistance of 100Ω or less
Drinking water, Underground water, Seawater, Wastewater, River water, Lake water, Rain-runoff, Liquid & Solid Digestates and more
USEPA 245.7; 1631e; ISO 17825; ISO12846
No special options available.