Waste deposit influences on groundwater quality as a tool for waste type and site selection for final storage quality

Arneth, J.-D.; Milde, G.; Kerndorff, H.; Schleyer, Ruprecht

doi:10.1007/bfb0011276

Cited by 31 publications

(12 citation statements)

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“…The mobilization of heavy metal ions from waste and their transport via leachates can represent a threat to groundwater supplies. Arneth et al (1989) investigated the contamination of aquifers from waste disposal sites and found contamination factors (mean concentration downstream/mean concentration upstream) of 4.7 for Cu and Zn, 5 for Pb, and >6.5 for Cd.…”

Section: Introductionmentioning

confidence: 99%

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

Matthes

Madsen

Kahr

1999

Clays and clay miner.

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Abstract--The sorption of Cd, Cu, Pb, and Zn ions by Na-rich bentonite, AI and Zr-pillared Na-rich bentonite (A1-MX80, Zr-MX80), the uncalcined hydroxy-intercalated precursors (HA1, HZr-MX80), and commercial Al-pillared bentonite EXM 534 was investigated. Experiments were conducted in ultrapure water and artificial leachate with varying pH. The experiments were performed over periods to 30 wk. Sorption characteristics were described with one and two-site Langmuir isotherms. The non-exchangeable quantities of heavy metals were determined by fusion of the sorbents after ion exchange with ammonium acetate.The sorption of Cd, Cu, Pb, and Zn by bentonite was dominated by cation exchange. In artificial leachate, the sorption was reduced due to competition with alkali and alkaline-earth cations. The sorption of Cu, Zn, and Pb at pH 4.9 and Cd at pH 6.9 by A1 and Zr-hydroxy-intercalated and pillared MX80 was governed also by cation exchange. In contrast, the sorbed quantities of Zn at pH 6.9 exceeded the cation exchange capacity (CEC) of HA1, HZr, A1, Zr-MX80, and EXM 534 and were partially nonexchangeable. The increase of the sorption of Zn with pH and its independence of the ionic strength of the solution at neutral pH suggest a complexation of Zn ions to surface hydroxyl groups of the intercalated A1 and Zr-polyhydroxo cations and pillars. This complexation is the dominating sorption mechanism. Removal of dissolved Zn from solution with time is attributed to surface precipitation. Al-hydroxy and pillared bentonites are considered potential sorbents of Zn ions from neutral pH aqueous solutions, such as waste waters and leachates.

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Section: Introductionmentioning

confidence: 99%

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

Matthes

Madsen

Kahr

1999

Clays and clay miner.

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“…9.10: Concentrations of trace elements (mg L À1 ) in leachates from municipal solid waste landfills. (From Ehrig 1989 constituents upstream and downstream from 33 waste disposal sites in West Germany indicated characteristic differences in pollutant mobilities (Arneth et al 1989). …”

Section: Metals In "Reactor" Landfillsmentioning

confidence: 99%

Elements and Compounds in Waste Materials

Föstner¹

2004

Elements and Their Compounds in the Environment

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“…Halogenated substances, especially chlorinated compounds, belong to the most widespread groundwater pollutants in the world [1] and need to be removed from the water cycle due to their harmfulness to humans [2]. Our aim is the development of field deployable analytical tools and methods for efficient and rapid on-site investigations.…”

Section: Introductionmentioning

confidence: 99%

Which parameters influence the quantitative determination of halogenated substances? A summary of systematic investigations

Mayer

Borsdorf

2015

Int. J. Ion Mobil. Spec.

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In recent years, we have intensively studied the ion chemistry of halogenated substances in ion mobility spectrometry (IMS). During atmospheric pressure chemical ionization (APCI) processes, dissociative electron transfer reactions between reactant ions and halogenated molecules occur and (H 2 O) n X − product ions are formed, which appear as distinct product ion peak in negative ion mobility spectra. These product ion peaks (obtained for different compounds) were used for comparing differences in detectability, sensitivity, peak position and resolution. We identified that structural features clearly affect detection capability in IMS, which can be attributed to the different bonding states of halogens within the molecule. Then we subsequently established that the resulting different bond strengths also determine the degree of mutual influence when various halogenated substances are simultaneously investigated. Regarding the experimental conditions, we observed that increasing humidity generally leads to a decrease in the relative abundance of product ions. However, the effect of humidity strongly depends on the way in which the water vapor is transported into the ion mobility spectrometer (carrier or drift gas). In contrast to the results achieved which were affected by increased humidity, elevating IMS cell temperatures resulted in more accurate detection of all substances investigated.

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Waste deposit influences on groundwater quality as a tool for waste type and site selection for final storage quality

Cited by 31 publications

References 1 publication

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

Elements and Compounds in Waste Materials

Which parameters influence the quantitative determination of halogenated substances? A summary of systematic investigations

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