Due to their unique properties, such as electronic constraint and high specific surface area, AgNPs exhibit novel behaviors that may affect biological processes such as uptake and accumulation, which might be significantly different to that of the bulk material or free silver (Ag) ion. Using a 50 mL sample, a preliminary method detection limit of 66 ng L-1 (n=14, DI water samples) was achieved.Silver nanoparticles (AgNPs) have become a central component in a wide range of commercial and consumer products including electronic, biomedical, and pharmaceutical drug delivery applications. Recoveries of 102.8 ± 4.1% were obtained for 25 µg L-1 silver spiked natural seawater samples. A solid phase extraction method for the quantification of dissolved silver in seawater was developed using Dowex 1-x8 anion exchange resin, 0.1 M thiourea/0.05% nitric acid solution, and quantification by ICP-MS. On-line matrix removal of the salt matrix prior to inductively coupled plasma mass spectrometry (ICP-MS) analysis has been developed to overcome these problems. The determination of silver in marine and coastal waters presents several challenges including low concentrations and matrix complexity of seawater, which creates interferences and other challenges for many instrumental techniques creating a requirement for additional separation steps. Reported open ocean concentrations of silver range from 0.1 - 2 ng L-1 while silver concentrations in coastal waters are typically 5 to 10 times higher than open ocean values (0.1 - 50 ng L-1). In marine systems, silver is regarded as being one of the most toxic and readily accumulated metals, and is known to be taken up and accumulate within marine invertebrates, fish, phytoplankton and seaweeds.
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