Metal oxide nanoparticles are finding increasing application in various commercial products, leading to concerns for their environmental fate and potential toxicity. It is generally assumed that will persist as small particles aquatic systems bioavailability could be significantly greater than of larger particles. The current study using nanoparticulate ZnO (ca. 30 nm) has shown this not always so. Particle characterization transmission electron microscopy dynamic light scattering techniques...

Over the last decade, nanoparticles have been used more frequently in industrial applications and consumer medical products, these of will likely continue to increase. Concerns about environmental fate effects materials stimulated studies predict concentrations air, water, soils determine threshold for their ecotoxicological on aquatic or terrestrial biota. Nanoparticles can be added directly fertilizers orplant protection products indirectly through application land wastewater treatment...

The effects of the short-term resuspension a contaminated anoxic estuarine sediment on solid-phase metal speciation have been studied. Preliminary experiments investigated oxidation rates model sulfide phases to provide mechanistic information for interpreting observations natural sediment. FeS and MnS were particularly labile oxidized rapidly in aerated waters. In contrast, CdS, CuS, PbS, ZnS kinetically stable over periods several hours. rate free (HS-) was significantly slower than that...

I. INTRODUCTION Chemical speciation may be defined as the determination of individual concentrations various chemical forms an element which together make up total concentration that in a sample. The next decade will certainly see blossoming interest from chemists, biochemists, and biologists techniques for speciation. This is because it becoming more apparent both bioavailability toxicity are critically dependent on form substance under test. Measurement nutrient or trace provides very...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of polymer-coated glassy carbon electrodes in anodic stripping voltammetryBoy. Hoyer, T. Mark. Florence, and Graeme E. BatleyCite this: Anal. Chem. 1987, 59, 13, 1608–1614Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published inissue 1 July 1987https://pubs.acs.org/doi/10.1021/ac00140a007https://doi.org/10.1021/ac00140a007research-articleACS PublicationsRequest reuse permissionsArticle...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption as a control of metal concentrations in sediment extractsPaul S. Rendell, Graeme E. Batley, and Alan J. CameronCite this: Environ. Sci. Technol. 1980, 14, 3, 314–318Publication Date (Print):March 1, 1980Publication History Published online1 May 2002Published inissue 1 March 1980https://doi.org/10.1021/es60163a002Request reuse permissionsArticle Views435Altmetric-Citations159LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant...

Environmental context. It cannot be assumed that nanomaterials entering aquatic environments will have the same impacts on biota as their macroscopic particle equivalents. If toxicities are different, this implications for way in which nanomaterial usage is regulated. Algae, at bottom of food chain, likely to a sensitive indicator toxic effects. Understanding physical and chemical factors controlling nanoparticle toxicity algae assist evaluating ecological risk. Abstract. In assessing risks...

Abstract The ability to predict metal toxicity in sediments based on measurements of simple chemical parameters is not possible using currently available sediment‐quality guidelines (SQGs). Past evaluations SQGs for metals indicated little difference their predictive abilities; however, the scientific understanding cause‐effect relationships progressing rapidly. Today, it clear that they can be protective benthic ecosystem health, but single‐value will ineffective predicting sediments....

Abstract The use of sediment quality guidelines to predict the toxicity metals in sediments is limited by an inadequate understanding exposure pathways and poor causal links between effects. For a 10‐d Cu‐spiked sediments, amphipod Melita plumulosa was demonstrated occur through combination dissolved dietary Cu pathways, but for bivalves Spisula trigonella Tellina deltoidalis , occurred primarily Cu. relatively oxidized that had moderate amounts organic carbon (2.6–8.3% OC), silt (20–100%...

The stability of metal sulfides to oxidation in seawater was investigated short-term (24 h) resuspension experiments using natural sediments and synthetic sulfide phases. Using acid volatile (AVS) measurements, ZnS, PbS, CdS phases were shown be resistant oxidation. AVS resuspended, highly anoxic, contaminated rapidly oxidized with <6% remaining after 24 h. This inconsistent their high particulate lead zinc content, which should stabilize against oxidation, suggesting that a large proportion...

The advances in studies of trace metal speciation and bioavailability since Mark Florence’s 1982 review the topic, published Talanta, have been comprehensively reviewed. While relative merits kinetic equilibrium approaches are still being determined, applications stripping voltammetry, including application microelectrodes an appreciation detection windows both CSV ASV, matched by introduction new dynamic techniques diffusive gradients thin films (DGTs), permeation liquid membranes (PLMs),...