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

Abstract

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

Extraction and chemical analysis of interstitial water from soils and rocks

“…However, additional measurements at other wavelengths showed that the shapes of the UV-visible spectra of the various soil solutions were quite similar (Table VII). There was a poor correlation between A360 and DOC as has also been found recently for New Hampshire river and lake waters (19).…”

Heavy metal complexation in sludge‐amended soil. The role of organic matter in metal retention

“…Dialysis bags containing 2 ml of the dialysis medium (0.1 M NaNO 3 , pH 7.0) were suspended into 50 ml of the organic extract solution. The volume of the diffusate (internal dialysis) solution was less than 4% of the reténtate (external dialysis) solution, ensuring a negligible effect of the diffusate solution volume on the chemical equilibrium among complexes present in the reténtate solution (30).…”

Fulvic acid: modifier of metal-ion chemistry

“…After the completion of ED experiments with SFA, this approach was extended to seven freshwater samples from southeastern New Hampshire (33). Equilibrium dialysis does not require sample modification such as addition of a supporting electrolyte, so the samples had only to be filtered through a 0.4-^.m polycarbonate membrane before titration with Cu2+ or Cd2+.…”