The complexation of metals with humic materials in natural waters

Mantoura, R.F.C.; Dickson, Andrew G.; Riley, J.P.

doi:10.1016/0302-3524(78)90130-5

Cited by 709 publications

(270 citation statements)

References 29 publications

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“…According to Wright & Zamuda (1987), the salinity effect is independent of cupric ion activity. Moreover, chemical speciation of Cu in estuaries is mainly governed by organic ligands (Mantoura et al 1978). In the Gironde estuary, the level of dissolved organic carbon decreased downstream (Etcheber 1983), suggesting a higher bioavailability of Cu at the mouth of the river.…”

Section: Discussionmentioning

confidence: 99%

“…In the Gironde estuary, the level of dissolved organic carbon decreased downstream (Etcheber 1983), suggesting a higher bioavailability of Cu at the mouth of the river. On the other hand, the bioavailability of Cd and Zn decreases as salinity increases due to increased chloride ion complexation but the phenomenon is much more marked for Cd than for Zn (Zirino & Yamamoto 1972, Mantoura et al 1978, as shown by stability constants (TuI-ner et al 1981). Depledge (1990) and Chan et al (1992) suggested that euryhaline invertebrates may adapt to brackish water through changes in water and electrolyte permeability which could interfere with trace metal uptake.…”

Section: Discussionmentioning

confidence: 99%

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Effects of natural factors (salinity and body weight) on cadmium, copper, zinc and metallothionein-like protein levels in resident populations of oysters Crassostrea gigas from a polluted estuary

Mouneyrac¹,

Amiard²,

Amiard‐Triquet³

1998

Mar. Ecol. Prog. Ser.

126

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The Gironde estuary has been shown to be the most Cd-contaminated area In France. Oysters Crassostrea gigas of different size classes were sampled from 3 sites between the mouth and 25 km upstream, to study the relative importance of natural and contamination factors on metal accumulation and metallothionein-like protein (MTLP) induction. The highest metal and MTLP concentrations were observed in the digestive gland. In all organs, the 3 metals were mainly cytosolic. An inverse relationship was generally observed between weight of soft tissues and metals or MTLP concentrations in the whole soft tissues, whereas the influence of weight on metal distribution among cytosolic and insoluble fractions was small. When oysters with similar weight of soft tissues were considered, no influence of salinity at different sites was found for Cu and Zn whereas the lowest soluble and insoluble Cd concentrations were observed at the mouth of the river. Salinity did not influence Cu and Zn distribution among the cytosolic or insoluble fractions whereas cytosolic Cd in gills and digestive gland (%) was higher at the mouth of the estuary than upstream. MTLP and metal concentrations were generally positively correlated except at those sites where metal concentrations were lowest. However when multiple regression analyses were performed, weight appeared also as a major or an important factor to explain vanations of MTLP levels, the prevalence of this natural factor versus contan~ination factors being different at ddferent sites. KEY WORDS. Oyster. Heavy metals. Metallothionein

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of natural factors (salinity and body weight) on cadmium, copper, zinc and metallothionein-like protein levels in resident populations of oysters Crassostrea gigas from a polluted estuary

Mouneyrac¹,

Amiard²,

Amiard‐Triquet³

1998

Mar. Ecol. Prog. Ser.

126

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“…However, it gives no specific information concerning the chemical and physical natures of these complexes. Mantoura et al 43 and Stumm and Morgan 44 have reported the following sequence of stability constants for metal complexation with humic materials: Mg < Ca < Cd, Mn, < Co < 532 ANALYTICAL SCIENCES APRIL 2003, VOL. 19 Ni, Zn < Cu < Hg.…”

Section: C18 Reversed Phase (In the Set Up)mentioning

confidence: 99%

Determination of Trace Metal Complexes by Natural Organic and Inorganic Ligands in Coastal Seawater

Abbasse¹,

Ouddane²,

Fischer³

2003

ANAL. SCI.

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The distribution, mobility, bioavailability, toxicity, bioaccumulation and biodegradability of chemical elements depend not only on their concentrations, but also on their physico-chemical associations with natural systems. [1][2][3][4] Several trace metals occur in natural water distributed between different oxidation states. At equilibrium, the species present are controlled not only by the pH, but also by the redox potential of the system that describes the progress of electron-transfer reactions. 5 The dissolved forms of trace elements are mainly present as free hydrated ions, ion pairs (where the coordinated water is retained), and inorganic and organic complexes with a covalent bound. For example, dissolved trace metals can also form complexes with a wide range of organic and inorganic compounds, depending on the pH, oxidation state, and relative abundance of the complexing agents. The main inorganic compounds are chloride, carbonate, sulfate, hydroxyl, and fluoride; the complexes formed between them and trace metals are almost always very labile. Organic ligands include both biochemical species of low molecular weight (<10 3 ), such as siderophores, carboxylic acids, aminoacids, sugars, small hydroxyacids, 6 etc., and heterogeneous compounds of unknown structure 7-9 with a wide range of relative molecular masses (10 3 -10 7 ). At any rate, there is great certitude that stronger ligands, which are able to complex metal ions, but are not yet completely identified, are present in seawater, most often at very low concentrations. These various forms of organic matters in aquatic systems come largely from living organisms, mainly as polypeptides and polysaccharides in algae exudates, 10 and from pollution sources. Estimating the ligand organic concentration in natural water has until now been a difficult problem. Generally, though the water of open-ocean contains only small amounts of organic matter.The maximum concentration of total organic carbon observed in surface waters is less than 200 µmol/L. 11 Especially prominent among organic matter compounds in aqueous systems are humic substances. These compounds, which result from living matter decay, are a mixture of organic polymers containing charged hydrophobic and hydrophilic groups that possess polyelectrolyte and multifunctional proprieties. In solution, these compounds can occur either in free form, often negatively charged, or bound to others, such as glycine, aspartic acid and alanine. The principle functional groups in humic matter are -COOH, -NH2, -OH and -SH, [12][13][14] It is well-documented that organic compounds form strong complexes with most metals in aquatic systems, and that seawater is a complex medium which contains a large variety of organic and inorganic ligands, including colloidal matter. We suggest that most trace metals are complexed in seawater and that some inorganic metals complexes are either labile or not stable. In contrast, metal-organic complexes are often stable and need various and specific treatments to be dissociated. In t...

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“…A high Cd concentration of about a few ppm in reddish soils and a preferential adsorp tion of Cd by ferro-manganese nodules in fresh water medium through some unknown mecha nisms may be responsible for high Cd content of manganese nodules. Low Cd concentration of about 10 ppm in oceanic nodules is certainly due to very small activity of cadmium ions contained in sea water through the formation of CdC12 , complex ions (CdCI+ and CdC13) and Cd organic compounds which are hardly adsorbed on man ganese dioxide in sea water medium (MANTOURA et al, 1978;KITANO and SAKATA, 1978;KITANO and FuJIYOsHI, 1979). …”

Section: A-2 Minor Elements In Manganese Nodulesmentioning

confidence: 99%

Terrestrial ferro-manganese nodules formed in limestone areas of the Ryukyu Islands Part I Major and minor constituents of terrestrial ferro-manganese nodules.

1981

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The complexation of metals with humic materials in natural waters

Cited by 709 publications

References 29 publications

Effects of natural factors (salinity and body weight) on cadmium, copper, zinc and metallothionein-like protein levels in resident populations of oysters Crassostrea gigas from a polluted estuary

Effects of natural factors (salinity and body weight) on cadmium, copper, zinc and metallothionein-like protein levels in resident populations of oysters Crassostrea gigas from a polluted estuary

Determination of Trace Metal Complexes by Natural Organic and Inorganic Ligands in Coastal Seawater

Terrestrial ferro-manganese nodules formed in limestone areas of the Ryukyu Islands Part I Major and minor constituents of terrestrial ferro-manganese nodules.

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