Long-Term Changes in Cadmium Bioavailability in Soil

• Published in: Environmental science & technology Vol. 32; no. 23; pp. 3699 - 3703
• Main Authors: Hamon, Rebecca E, McLaughlin, Mike J, Naidu, Ravi, Correll, Ray
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01.12.1998
• Subjects: Agronomy. Soil science and plant productions; Applied sciences; BIOAVAILABILITY; BIODISPONIBILIDAD; BIODISPONIBILITE; Biological and medical sciences; Biological and physicochemical properties of pollutants. Interaction in the soil; CADMIO; CADMIUM; Chemicals; Chemistry; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; IMPURITIES; NEW SOUTH WALES; NOUVELLE GALLES DU SUD; NUEVA GALES DEL SUR; PHOSPHATE FERTILIZER IMPURITIES; PHYTOAVAILABILITY; Pollution; Pollution, environment geology; SOIL; Soil and sediments pollution; Soil and water pollution; Soil science; Soils; SOL; SUELO; SUPERFOSFATO; SUPERPHOSPHATE; TRITICUM TURGIDUM; Australia; Oceania; Cadmium; Monocotyledones; Pollutant behavior; Cultivated soil; Bioavailability; Superphosphate; Phosphorus fertilization; Soil pollution; Cereal crop; Clay loam soil; Heavy metal; Triticum turgidum; Gramineae; Content; Angiospermae; Spermatophyta
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/es980198b

A study was conducted to examine changes in total and phytoavailable Cd in a soil that had received inputs of Cd due to fertilization with single superphosphate (SSP) at various rates since 1948. Accumulation of Cd in the soil was highly correlated to the application rate of SSP. No evidence was found to indicate offsite movement of Cd, either through horizontal transfer or via leaching through the profile. Increases in soil Cd led to an increase in the Cd content of wheat that was grown in the soil. However, using a radioisotope dilution technique, a significant proportion of the added Cd was found to exist in a non-bioavailable pool in the soil. A model was developed which estimated that Cd was being fixed in this soil at a rate of 1−1.5% of the total added Cd per year.