Naslov
A contribution to environmenral risk assesment for transport of cadmium through groundwater layers : case study of the Sava River (near Zagreb, Croatia) region
(A contribution to environmental risk assesment for transport of cadmium through groundwater layers : Case study of the Sava River (near Zagreb, Croatia) region)

Autori
Vuković, Marijan ; Bišćan, Jasenka

Izvornik
Water Research (0043-1354) 32 (1998), 12; 3765-3771

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Cd; sediments; column experiments; aquifer material; environmental risk assesment

Sažetak
Adsorption capacities of cadmium on aqufer material of the Sava River alluvial sediment were determined as a function of flow rate, pH and presence of organic coating using laboratory column technique. In a permeameter with constant hydrostatic pressure, a laboratory coefficient of permeability; Kb, and a specific coefficient of permeability, Ks, have been determined. The value of 28.6 Darcy for specific permeability shows that the sediment belongs to a good aquifer (permeability over 1 Darcy). The adsorption capacity of cadmium at the bottom of the breakthrough curve, Csb, of a fresh sediment at pH 5.8 varied from 0.40 to 0.45 mg/g at axial flow rate between 98 and 501 cm/h. Capacity values of maximum adsorption, Cs, were in the range from 0.67 to 0.72 mg/g. This implies a significance of Csb values in risk assesment studies concerning a discharge of cadmium into rivers and lakes and its input to groundwater layers. Distribution coefficients, Kd, were between 26.3 and 28.2 ml/g. In order to create a more reproducible column, a fraction between 125 and 250 micrometer was used. In that case Cs values varied from 0.25 mg/g at pH 2.5 (organic coating present) to 1.12 mg/g at pH 5.8 (organic coating removed).

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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