Effect of chemical speciation on the accumulation of cadmium by the caddisfly,Hydropsyche sp.

Dressing, Steven A.; Maas, Richard P.; Weiss, Charles M.

doi:10.1007/bf01608571

Cited by 35 publications

(17 citation statements)

References 15 publications

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“…In the FT, mayflies seemed to take up more Cd than in the ST, perhaps because of the availability of fine detritus with adhering Cd as food . The uptake of Cd after the whole exposure period was measurable at all concentrations, supporting the results of Canton & Slooff (1982) and Dressing et al . (1982), which show that Cd uptake is fast and linear during the first 2-4 days of exposure .…”

Section: Uptake Of CDsupporting

confidence: 81%

Acute toxicity of Cd in stream invertebrates in relation to pH and test design

Gerhardt

1992

Hydrobiologia

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The acute toxicity of Cd to three stream invertebrates (Baetis rhodani Pict ., Leptophlebia marginata (L .) and Pisidium sp .) was tested at pH 5 and 7 simultaneously in static (ST) and flow through (FT) systems . In the static design, the animals were kept individually in small boxes containing aerated stream water . In the flow through system, the three species were kept together in circular aquaria simulating stream ecosystems with patches of gravel and recirculating aerated stream water . The nominal Cd concentrations ranged from 0 to 5 mg 1 -1 during an exposure period of 120 h .The graphically obtained LC50 (120 h) values for B . rhodani were : pH 7: 2 .3 mg 1 -1 (ST), 2.5 mg I -1 (FT) and pH 5 : 3 mg 1 -1 (ST), 1 mg I -1 (FT) . For L. marginata the following values were found : pH 7: > 5 mg 1 -1 (ST), 4.4 mg 1 -1 (FT) and pH 5 : > 5 mg 1 -1 (ST), 3 .6 mg 1 -1 (FT) . Pisidium sp . showed a 100% survival in all Cd-and pH-treatments . From thee values it can be concluded that L. marginata is more tolerant than B . rhodani and that especially both species tolerated Cd better in the ST system than in the FT system, especially at pH 5 .At neutral pH the Cd-concentrations in the animals were higher than at low pH, probably due to surface adsorption of Cd onto the body . B . rhodani tended to molt more at low than at neutral pH . 93

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Section: Uptake Of CDsupporting

confidence: 81%

Acute toxicity of Cd in stream invertebrates in relation to pH and test design

Gerhardt

1992

Hydrobiologia

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“…Most of the cadmium ion in eco-biological systems is of a phthalate complex. complexed with biological ligands (4,5). It has been reported that large number ofphthalate derivatives of cadmium demonstrate diverse pathological effects (6).…”

Section: Introductionmentioning

confidence: 99%

Cd(II) complexes with phthalic acids: solution study and crystal structure of cadmium(II) phthalate hydrate

Vaz¹,

Duc²,

Petit‐Ramel³

et al. 1996

Can. J. Chem.

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Abstract:The acid-base properties of phthalic acid (H,L) have been determined by simultaneous spectroscopic, potentiometric, and polarographic measurements. Stability constants of the complexes CdHLf, CdL, CdL,'-, C~L;-, C~H,L; and their distribution versus pH were determined at 25OC and ionic strength in 0.1 M NaNO,. The advantages of each method are pointed out in such a way as to describe more precisely the interactions between cadmium and phthalic acid over a wide range of ligand and metal concentrations. The crystal structure of the [CdL] complex has been established by single-crystal X-ray diffraction. Cd (C,H,O,).H,O is orthorhombic, space group Pbca, a = 23.463(5), b = 9.293(2), c = 7.730(1) A, Z = 8, and p = 2.323 g cm-,.The structure was refined to a final R value of 0.054 for 323 1 unique reflections with I > 3u(4. The crystal is a three-dimensional polymeric network in which the Cd atom is seven-coordinated. The first ligand coordinates in a bidentate carboxylate (0,O') mode (Cd-0 = 2.372(5) and 2.445(5) A); a second ligand is part of a seven-membered ring formed with its two carboxylate groups (Cd-0 = 2.317(5) and 2.341(5) A); two other phthalic ligands make one coordination bond (Cd-0 = 2.255(5) and 2.449(5) A) while the seventh bond is a water molecule (Cd-0 = 2.333(6) A).Key words: crystal structure, cadmium complexes, phthalic acid complexes.

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“…3 To whom all corerspondence should be addressed; e-mail: ffj2003@163169.net. ological ligands therein [11,12]. Therefore, the coordination chemistry of Cd 2+ ions with such ligands is of great interest [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Crystal Structure, and Characterizations of tetra(N-Benzoylmethyl-benzimidazole)dibromide cadmium(II) Complex: CdBr2(C7H5N2CH2COPh)4

et al. 2005

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The structure of CdBr 2 (C 7 H 5 N 2 CH 2 COPh) 4 has been determined by X-ray crystallography. It crystallizes in the tetragonal system, space group P4/n, with lattice parameters a = 14.904(3)Å, b = 14.904(3)Å, c = 11.817(2)Å, and Z = 2. The crystal structure consists of monomeric molecules of [CdBr 2 (C 7 H 5 N 2 CH 2 COPh) 4 ] with distorted octahedron geometry for the CdBr 2 N 4 chromophore. It is also characterized by elemental analysis, IR spectrum, electronic spectrum, and thermogravimetricdifferential scanning calorimetry (TG-DSC).

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Effect of chemical speciation on the accumulation of cadmium by the caddisfly,Hydropsyche sp.

Cited by 35 publications

References 15 publications

Acute toxicity of Cd in stream invertebrates in relation to pH and test design

Acute toxicity of Cd in stream invertebrates in relation to pH and test design

Cd(II) complexes with phthalic acids: solution study and crystal structure of cadmium(II) phthalate hydrate

Synthesis, Crystal Structure, and Characterizations of tetra(N-Benzoylmethyl-benzimidazole)dibromide cadmium(II) Complex: CdBr2(C7H5N2CH2COPh)4

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