Testing Hg in Water Effortlessly with NIC RA-series Envirotech Online

Testing mercury in water is often daunting as mercury is notoriously known for its memory effect.

The NIC RA-series has achieved an almost legendary status among specialists in various industries, thanks in no small part to their ability to provide precise results using the Discrete Direct Purge (DDP) technique employed in all NIC RA-series.

“In RA-series, we minimize the effects of contamination that comes from mercury by eliminating the acidic contact to the analytes’ pathway,” said the NIC Application team.

“By fine-tuning this DDP technique, our latest model, the RA-4300FG + of Cold Vapor Atomic Fluorescence Spectroscopy (CVAFS) can measure ultra-trace levels of mercury with excellent precision and accuracy,” Takashi Yasuda, Director of NIC, said. “This product and technique are perfect for rain and seawater testing applications where mercury is usually in its ultra-trace level.”

NIC also offers some models under the RA-series with cold vapor atomic absorption spectroscopy (CVAAS) detector as not all laboratories require CVAFS for the time being.

Both CVAAS and CVAFS under the RA-series utilize the DDP technique, which allows measurement down to sub-parts-per-billion (ppb) and sub-parts-per-trillion (ppt) respectively, meeting the stringent QC requirements in both EPA 245.1 and EPA 1631e. R&D team said.

More information about RA-Series:

Watch here on how the DDP technique works:


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