Determination of total mercury for marine environmental monitoring studies by solid sampling continuum source high resolution atomic absorption spectrometry

作者：Mandjukov Petko; Orani Anna Maria; Han Eunmi; Vassileva Emilia^*

来源：Spectrochimica Acta Part B: Atomic Spectroscopy , 2015, 103: 24-33.

DOI：10.1016/j.sab.2014.11.006

• Mercury
• High resolution continuum source atomic absorption spectroscopy
• Solid sampling
• Marine environmental sample
• Method validation

The most critical step in almost all commonly used analytical procedures for Hg determination is the sample preparation due to its extreme volatility. One of the possible solutions of this problem is the application of methods for direct analysis of solid samples. The possibilities for solid sampling high resolution continuum source atomic absorption spectrometry (HR CS AAS) determination of total mercury in various marine environmental samples e.g. sediments and biota are object of the present study. The instrumental parameters were optimized in order to obtain reproducible and interference free analytical signal. A calibration technique based on the use of solid standard certified reference materials similar to the nature of the analyzed sample was developed and applied to various CRMs and real samples. This technique allows simple and reliable evaluation of the uncertainty of the result and the metrological characteristics of the method. A validation approach in line with the requirements of ISO 17025 standard and Eurachem guidelines was followed. With this in mind, selectivity, working range (0.06 to 25 ng for biota and 0.025 to 4 ng for sediment samples, expressed as total Hg) linearity (confirmed by Student's t-test), bias (1.6-4.3%), repeatability (4-9%), reproducibility (9-11%), and absolute limit of detection (0.025 ng for sediment, 0.096 ng for marine biota) were systematically assessed using solid CRMs. The relative expanded uncertainty was estimated at 15% for sediment sample and 8.5% for marine biota sample (k = 2). Demonstration of traceability of measurement results is also presented. The potential of the proposed analytical procedure, based on solid sampling HR CS MS technique was demonstrated by direct analysis of sea sediments form the Caribbean region and various CRMs.
Overall, the use of solid sampling HR CS MS permits obtaining significant advantages for the determination of this complex analyte in marine samples, such as straightforward calibration, a high sample throughput (15 min per sample), sufficient precision, a suitable limit of detection, and reduced risk of analyte loss and contamination. Published by Elsevier B.V.

• 出版日期2015-2