Cadmium buffering capacity and accumulation in Swiss chard in some sludge-amended soils
- Washington State Univ., Puyallup, WA (USA)
Cadmium sorption by soils could be an important factor regulating the plant availability of soil Cd. Five soils containing varying amounts of Cd resulting from previous sludge application were analyzed for residual Cd availability under field conditions using Swiss chard (Beta vulgaris L.) as an indicator plant. The Cd accumulation was not highly correlated with DTPA (diethylene-triamine-penta-acetic acid)-extractable Cd (R{sup 2} = 0.53). This result may be explained by a dissimilar response of plant Cd and DTPA Cd to soil pH. However, DTPA extracted 50 to 75% of sorbed Cd, depending on soil type. As such, DTPA Cd could be used to predict Cd accumulation by converting it to the quantity of Cd sorbed (Cd{sub s}). The Cd{sub s} was combined with the pH-dependent Cd buffering capacity (BC) to obtain Cd{sub s}/BC, an intensity factor for soil Cd. The buffering capacity is defined as the slope of the Cd-sorption isotherm. The Cd{sub s}/BC and plant Cd were highly correlated over all the soils, using the Michaelis-Menten equation as a model (R{sup 2} = 0.83).
- OSTI ID:
- 5598268
- Journal Information:
- Soil Science Society of America Journal; (United States), Journal Name: Soil Science Society of America Journal; (United States) Vol. 54:1; ISSN SSSJD; ISSN 0361-5995
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
540250 -- Environment
Terrestrial-- Site Resource & Use Studies-- (1990-)
ABSORPTION
ADSORBENTS
AMINO ACIDS
BIOADSORBENTS
BIOLOGICAL AVAILABILITY
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
CADMIUM
CARBOXYLIC ACIDS
CHELATING AGENTS
DRUGS
DTPA
ELEMENTS
GROUND DISPOSAL
MANAGEMENT
MATERIALS
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLANTS
RADIOPROTECTIVE SUBSTANCES
ROOT ABSORPTION
SEWAGE
SEWAGE SLUDGE
SLUDGES
SOILS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
UPTAKE
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES