Arsenic speciation in estuarine and oceanic waters by hydride generation-atomic fluorescence spectroscopy ...
A method has been developed for the routine determination of four arsenic species (arsenite, arsenate, monomethylarsenic and dimethylarsenic) in natural water, and has been applied to a study of arsenic cycling in open ocean (Atlantic and Southern Ocean) and estuarine (Huon Estuary, Tasmania) waters...
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| Format: | Thesis |
| Language: | unknown |
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University Of Tasmania
2023
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| Online Access: | https://dx.doi.org/10.25959/23235521.v1 https://figshare.utas.edu.au/articles/thesis/Arsenic_speciation_in_estuarine_and_oceanic_waters_by_hydride_generation-atomic_fluorescence_spectroscopy/23235521/1 |
| Summary: | A method has been developed for the routine determination of four arsenic species (arsenite, arsenate, monomethylarsenic and dimethylarsenic) in natural water, and has been applied to a study of arsenic cycling in open ocean (Atlantic and Southern Ocean) and estuarine (Huon Estuary, Tasmania) waters. The method uses hydride generation and cold trapping of the hydrides, coupled with atomic fluorescence detection (AFS) at 193.7 nm. With the optimised system, detection ‚Äö limits for As(11), As(V), MMA and DMA are 2.3, 0.9, 2.4 and 3.7 ng L-1 , respectively, in a 5-mL sample. The precision for nine sample replicates was better than 3.5% for all the arsenic species. Accuracy of the method was determined by analysis of a seawater certified reference material (NASS-4) and by recovery studies on natural samples. The manual method was semi-automated and modified for shipboard use by automating several of the procedures in the analytical sequence, including addition of NaBH4 to samples, cooling and heating the U-trap ... |
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