Abstract
Various isolation techniques (ion — exchange, extraction, volatilization, distillation) were used to separate organic Hg, followed by cold vapor atomic absorption spectrophotometry (CV AAS) for determination of total organic Hg, and/or gas chromatography (electron capture detector) for determination of McHg and EtHg if present. Some currently available CRMs with certified total Hg values, including NBS Oyster Tissue 1566, NBS Horse Kidney H-9, IAEA Fish Flesh Homogenate MA-A-2/TM, IAEA Fish Tissue Lyophilized MA-B-3/TM, IAEA Mussel Tissue MA-M-2/TM, IAEA Copepod Homogenate MA-A-1/TM, IAEA Shrimp Tissue Homogenate MA(S)-MEDPOL-86/TM, NIES No.5 Human Hair, and NIES No.9 Sargasso were investigated. CRMs from the National Research Council of Canada (TORT-1, DORM-1, DOLT-1) which have recently been certified for MeHg, were also analyzed. Results obtained by different approaches show good agreement. The advantage of GC which permits different organic compounds to be determined was demonstrated in the case of some IAEA CRMs where both McHg and EtHg was found; indirect CV AAS gives the results for total organic Hg. Therefore it can be suggested that various currently available CRMs for total Hg can also be used for establishment of recommended values for McHg (and EtHg if present) and organic Hg. However, additional intercalibration exercises or data from other laboratories are necessary to obtain a consensus.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
