Determination of inorganic mercury and methylmercury in Zooplankton and fish samples by speciated isotopic dilution GC-ICP-MS after alkaline digestion

TY - JOUR

T1 - Determination of inorganic mercury and methylmercury in Zooplankton and fish samples by speciated isotopic dilution GC-ICP-MS after alkaline digestion

AU - Perna, Lorenzo

AU - LaCroix-Fralish, Angela

AU - Stürup, Stefan

PY - 2005/3/1

Y1 - 2005/3/1

N2 - Species-specific isotope dilution (ID) in combination with gas chromatography-inductively coupled plasma-mass spectrometry (GC-ICP-MS) for separation and determination of methylmercury (MeHg) and inorganic mercury (Hg) in fish tissue and Zooplankton is described. Samples were digested with methanolic potassium hydroxide. Analytes were derivatized with sodium tetraethylborate and absorbed in an isooctane trap. ID analysis was performed using an enriched spike of 201Hg and a laboratory synthesized enriched spike of Me Hg. The precision of repeated measurements was always less than 5%. The absolute detection limits obtained with GC-ICP-MS for MeHg and Hg were 2.8 ng and 4.6 ng, respectively. Analytical precision was typically better than 5% over ten repeated measurements. The accuracy of the method has been validated with certified reference materials (DORM-2 and BCR 414). The total mercury concentration results of the real samples as well as the CRM have been compared with those obtained by cold vapor-high resolution ICP-MS using ID approach.

AB - Species-specific isotope dilution (ID) in combination with gas chromatography-inductively coupled plasma-mass spectrometry (GC-ICP-MS) for separation and determination of methylmercury (MeHg) and inorganic mercury (Hg) in fish tissue and Zooplankton is described. Samples were digested with methanolic potassium hydroxide. Analytes were derivatized with sodium tetraethylborate and absorbed in an isooctane trap. ID analysis was performed using an enriched spike of 201Hg and a laboratory synthesized enriched spike of Me Hg. The precision of repeated measurements was always less than 5%. The absolute detection limits obtained with GC-ICP-MS for MeHg and Hg were 2.8 ng and 4.6 ng, respectively. Analytical precision was typically better than 5% over ten repeated measurements. The accuracy of the method has been validated with certified reference materials (DORM-2 and BCR 414). The total mercury concentration results of the real samples as well as the CRM have been compared with those obtained by cold vapor-high resolution ICP-MS using ID approach.

UR - http://www.scopus.com/inward/record.url?scp=15244358478&partnerID=8YFLogxK

U2 - 10.1039/b410545a

DO - 10.1039/b410545a

M3 - Journal article

AN - SCOPUS:15244358478

SN - 0267-9477

VL - 20

SP - 236

EP - 238

JO - Journal of Analytical Atomic Spectrometry

JF - Journal of Analytical Atomic Spectrometry

IS - 3

ER -