A <i>p</i>H‐DEPENDENT MODEL FOR THE CHEMICAL SPECIATION OF COPPER, ZINC, CADMIUM, AND LEAD IN SEAWATER

Zirino, Alberto; Yamamoto, Sachio

doi:10.4319/lo.1972.17.5.0661

Cited by 308 publications

(92 citation statements)

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“…4 reported previously that the presence of copper ions in a parent solution favors aragonite forma tion more intensively than that of zinc ions (KITANo et al, 1969). The values of activity coefficients of very small amoutns of zinc and copper dissolved in pure water are both unity, and those in sea water are about 0.024 and 0.002 respectively (ZIRINO and YAMAMOTO, 1972 …”

Section: Resultsmentioning

confidence: 93%

Adsorption of zinc and copper ions on calcite and aragonite and its influence on the transformation of aragonite to calcite.

1976

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Section: Resultsmentioning

confidence: 93%

Adsorption of zinc and copper ions on calcite and aragonite and its influence on the transformation of aragonite to calcite.

1976

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“…Cd 2þ has a strong complex formation constant with EDTA (at 25 (Martell and Smith, 1989), which agrees well with our result: Mag-Ligand showed high removal efficiency across different pH, especially from pH 3 to 7. However, starting from pH 8 there is increasing formation of Cd (OH) 2 (Zirino and Yamamoto, 1972), which decreases CdðEDTAÞ 2À and CdðHEDTAÞ À formation.…”

Section: Effect Of Ph On CD Removalmentioning

confidence: 99%

EDTA functionalized magnetic nanoparticle sorbents for cadmium and lead contaminated water treatment

2015

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“…For example, dissolved cadmium in seawater exists mostly as chloro-complexes (e.g. CdCl + , CdCl 2 0 , CdCl 3 -) with only a small percentage (ca 2.5%) as the free Cd ++ ion (Zirino & Yamamoto 1972, Mantoura et al 1978, Bruland 1983, Rainbow et al 1993. Reductions in salinity reduce the amount of chloride present and increase the percentage of dissolved cadmium present as the free metal ion (Rainbow et al 1993).…”

mentioning

confidence: 99%

Physicochemistry or physiology: cadmium uptake and effects of salinity and osmolality in three crabs of different ecologies

Rainbow¹,

Black²

2005

Mar. Ecol. Prog. Ser.

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The effects of salinity and osmolality differences on the uptake rates of dissolved cadmium were investigated in 3 crabs of different ecologies -the euryhaline common shore crab Carcinus maenas, the extremely euryhaline Chinese mitten crab Eriocheir sinensis, and a more stenohaline crab, the velvet swimming crab Necora puber. This study tests predictions derived from the interpretations of the authors from a study of Zn uptake by the same crabs, in terms of the balance between physicochemical and counteractive physiological effects controlling trace metal uptake rates from solution. As predicted, reduced salinities caused increases in the cadmium uptake rate of E. sinensis as expected from the free metal ion model, with increased free cadmium ion availabilities in conditions of reduced chloride complexation. In the cases of C. maenas and N. puber, however, decreased salinity was associated with reduced cadmium uptake, a result interpreted in terms of a physiological response by these crabs to low salinity offsetting the physicochemical effect of increased free cadmium ion availability. This physiological response may include reductions in apparent water permeability with reduced salinities. Osmolality experiments showed that the physiological responses made by the crabs to decreases in salinity could not be explained simply by responses to changes in osmotic pressure of the medium. The interaction of physiology and physicochemistry controls rates of trace metal uptake from solution by these ecophysiologically distinct crab species.KEY WORDS: Cadmium uptake · Salinity · Osmolality · Crabs · Carcinus maenas · Eriocheir sinensis · Necora puber Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 286: [217][218][219][220][221][222][223][224][225][226][227][228][229] 2005 al. 1990, Rainbow et al. 1993), or changes in salinity that alter concentrations of inorganic anions such as chloride that complex particular metal ions (Nugegoda & Rainbow 1989a,b, Rainbow et al. 1993, Rainbow & Black 2002. For example, dissolved cadmium in seawater exists mostly as chloro-complexes (e.g. CdCl + , CdCl 2 0 , CdCl 3 -) with only a small percentage (ca 2.5%) as the free Cd ++ ion (Zirino & Yamamoto 1972, Mantoura et al. 1978, Bruland 1983, Rainbow et al. 1993. Reductions in salinity reduce the amount of chloride present and increase the percentage of dissolved cadmium present as the free metal ion (Rainbow et al. 1993). Such physicochemical effects on the rates of uptake of trace metals by invertebrates are independent of the invertebrates themselves (Rainbow 1997, Rainbow & Black 2002.On the other hand, some aquatic invertebrates can affect the rate of trace metal uptake from solution by making a physiological response to changes in the medium, for example to salinity reduction (Rainbow et al. 1993, Rainbow & Kwan 1995, Rainbow & Black 2002. Such physiological intercession that affects trace metal uptake rates is by no means a universal feature of aquatic invertebrates, and see...

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A pH‐DEPENDENT MODEL FOR THE CHEMICAL SPECIATION OF COPPER, ZINC, CADMIUM, AND LEAD IN SEAWATER

Cited by 308 publications

References 5 publications

Adsorption of zinc and copper ions on calcite and aragonite and its influence on the transformation of aragonite to calcite.

Adsorption of zinc and copper ions on calcite and aragonite and its influence on the transformation of aragonite to calcite.

EDTA functionalized magnetic nanoparticle sorbents for cadmium and lead contaminated water treatment

Physicochemistry or physiology: cadmium uptake and effects of salinity and osmolality in three crabs of different ecologies

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