Trace metal ion filtration at pH 5 and 7

Truitt, Ralph E.; Weber, James H.

doi:10.1021/ac50048a043

Cited by 38 publications

(14 citation statements)

References 25 publications

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“…If humic matter is important in natural water metal ion binding, SFA and natural water solutions should show similar Cu2+ and Cd2+ binding trends. For five samples Cu2+ and Cd2+ PBL values (Table I) follow the trend expected, because Cu2+ PBL values (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) µ ) are larger than the Cd2+ values (0-10 µ ) of the same water sample.…”

Section: Resultssupporting

confidence: 75%

“…The 1000 molecular weight cutoff (mwco) Spectra/Por 6 dialysis bags (Spectrum Industries, Los Angeles, CA) were cleaned with a procedure recommended by Guy (11) as modified by Truitt and Weber (9). Natural water filtration was accomplished with the polycarbonate filter assembly described by us (12), but a 142-mm Teflon and Plexiglass filter support (Nuclepore Corp., Pleasanton, CA) was substituted for the 47-mm polycarbonate support.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Copper(II)- and cadmium(II)-binding abilities of some New Hampshire freshwaters determined by dialysis titration

Truitt¹,

Weber²

1981

Environ. Sci. Technol.

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However, there are two unexpected findings. Firstly, the particle size distributions for the metals are generally coarser than might be anticipated from a foreknowledge of the corresponding particle sizes in ambient air, outside the industrial workplace. It is suggested that this phenomenon is due to the fact that, in the industrial case, small particles originating form combustion and condensation processes may be airborne in sufficiently high number concentrations to favor their coagulation.Secondly, it appears that lead oxides cannot be identified infallibly in the smelter environment by XRD. These compounds are almost certainly airborne in substantial proportions at a number of sites, e.g., the dross plant and the slagging floor of the ISF plant. We surmise that the lead oxides present in the works atmosphere have an amorphous or poorly crystalline structure. (In contrast, the ubiquitous presence of ZnO suggests that this compound occurs as a distinctly crystalline phase.) Generally, at each location, the phases identified in samples

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Section: Resultssupporting

confidence: 75%

Section: Methodsmentioning

confidence: 99%

Copper(II)- and cadmium(II)-binding abilities of some New Hampshire freshwaters determined by dialysis titration

Truitt¹,

Weber²

1981

Environ. Sci. Technol.

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“…Unfortunately, adsorption of the elements onto the blood bags or the bottle walls cannot be fully excluded. This type of adsorption has been demonstrated for several elements in natural waters (Truitt and Weber 1979). However, the relatively low pH of our samples, combined with the rapidity with which the on-board filtration was carried out after retrieval (< 2 h) and the storage of filtered samples in acidcleaned PVC bags or HDPE bottles, should limit losses due to adsorption (Batley and Gardner 1977).…”

Section: On the Processes Occurring In Ex Situ Filtrationmentioning

confidence: 79%

A comparison of in situ vs. ex situ filtration methods on the assessment of dissolved and particulate metals at hydrothermal vents

Cotte

Waeles

Pernet-Coudrier

et al. 2015

Deep Sea Research Part I: Oceanographic Research Papers

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A comparison of in situ vs. ex situ filtration methods on the assessment of dissolved and particulate metals at Hydrothermal vents, Deep-Sea Research Part I, http://dx. ABSTRACTThe objective of this study was to assess the impact of the filtration method (in situ vs. ex situ) on the dissolved/particulate partitioning of 12 elements in hydrothermal samples collected from the Lucky Strike vent field (Mid-Atlantic Ridge; MAR). To do so, dissolved (< 0.45 µm) and particulate Mg, Li, Mn, U, V, As, Ba, Fe, Zn, Cd, Pb and Cu were measured using different techniques (HR-ICP-MS, ICP-AES and CCSA). Using in situ filtration as a baseline, we showed that ex situ filtration (on-board and on shore after freezing) resulted in an underestimation of the dissolved pool, which was counterbalanced by an overestimation of the particulate pool for almost all the elements studied. We also showed that on-board filtration was acceptable for the assessment of dissolved and particulate Mn, Mg, Li and U for which 2 the measurement bias for the dissolved fraction did not exceed 3%. However, in situ filtration appeared necessary for the accurate assessment of the dissolved and particulate concentrations of V, As, Fe, Zn, Ba, Cd, Pb and Cu. In the case of Fe, on-board filtration underestimated the dissolved pool by up to 96%. Laboratory filtration (after freezing) resulted in a large bias in the dissolved and particulate concentrations, unambiguously discounting this filtration method for deep-sea chemical speciation studies. We discuss our results in light of the precipitation processes that can potentially affect the accuracy of ex situ filtration methods.

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“…In each test, unfiltered exposure waters from all controls and exposure concentrations were analyzed for total concentrations of metals (including Cd, Cu, and Zn), major inorganic cations (Ca 2+ , Mg 2+ , Na + , K + ), and sulfur using an Optima 5300 ICP–optical emission spectrophotometer (ICP–OES; PerkinElmer). The exposure waters were not filtered before analysis because preliminary tests demonstrated that commercial filters can either sorb metals from or leach metals into initial volumes of water that are passed through the membranes (Supplemental Data, Figures S1 and S2; see also Truitt and Weber ). Consequently, the small volumes (<100 mL) of exposure waters used in these D. magna toxicity tests were not sufficient to adequately rinse the filters or exceed their sorption capacity.…”

Section: Methodsmentioning

confidence: 99%

Acute toxicity of binary and ternary mixtures of Cd, Cu, and Zn to Daphnia magna

Meyer

Ranville

Pontasch

et al. 2015

Enviro Toxic and Chemistry

115

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Standard static-exposure acute lethality tests were conducted with Daphnia magna neonates exposed to binary or ternary mixtures of Cd, Cu, and Zn in moderately hard reconstituted water that contained 3 mg dissolved organic carbon/L added as Suwannee River fulvic acid. These experiments were conducted to test for additive toxicity (i.e., the response to the mixture can be predicted by combining the responses obtained in single-metal toxicity tests) or nonadditive toxicity (i.e., the response is less than or greater than additive). Based on total metal concentrations (>90% dissolved) the toxicity of the tested metal mixtures could be categorized into all 3 possible additivity categories: less-than-additive toxicity (e.g., Cd-Zn and Cd-Cu-Zn mixtures and Cd-Cu mixtures when Cu was titrated into Cd-containing waters), additive toxicity (e.g., some Cu-Zn mixtures), or more-than-additive toxicity (some Cu-Zn mixtures and Cd-Cu mixtures when Cd was titrated into Cu-containing waters). Exposing the organisms to a range of sublethal to supralethal concentrations of the titrated metal was especially helpful in identifying nonadditive interactions. Geochemical processes (e.g., metal-metal competition for binding to dissolved organic matter and/or the biotic ligand, and possibly supersaturation of exposure waters with the metals in some high-concentration exposures) can explain much of the observed metal-metal interactions. Therefore, bioavailability models that incorporate those geochemical (and possibly some physiological) processes might be able to predict metal mixture toxicity accurately.

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Trace metal ion filtration at pH 5 and 7

Cited by 38 publications

References 25 publications

Copper(II)- and cadmium(II)-binding abilities of some New Hampshire freshwaters determined by dialysis titration

Copper(II)- and cadmium(II)-binding abilities of some New Hampshire freshwaters determined by dialysis titration

A comparison of in situ vs. ex situ filtration methods on the assessment of dissolved and particulate metals at hydrothermal vents

Acute toxicity of binary and ternary mixtures of Cd, Cu, and Zn to Daphnia magna

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