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This study demonstrated the signal enhancement interference from soluble iron (Fe) during mercury (Hg) determination in water by cold vapor atomic absorption spectrometry (CV-AAS) using sodium borohydride (NaBH 4 ) as reductant. In the presence of 50 mg L -1 soluble Fe, Hg values will be overestimated by around 25%. The reason for the Hg signal enhancement is still unclear, but it is speculated to be attributable to the catalyst function for the equilibrium reduction reaction between Hg 2+ and BH 4  - from the atomic Fe formed at the same time. Using the matrix matching calibration standards prepared in 50 mg L -1 Fe solution, the problem of Hg overestimation could be minimized. This study also indicated that stannous chloride (SnCl 2 ), another common reductant for Hg analysis, does not suffer from the overestimation problem from soluble Fe in the presence of NaBH 4 .

analytical sciences

Interference from Soluble Iron on Mercury Determination in Water by Cold Vapor Atomic Absorption Spectrometry (CV-AAS) with Sodium Borohydride as Reductant