Adsorption/desorption of copper by a sandy soil amended with various rates of manure, sewage sludge, and incinerated sewage sludge

• Published in: Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Pesticides, food contaminants, and agricultural wastes, 2005-01, Vol.40 (4), p.687-696
• Main Authors: Alva, A.K, Baugh, T.J, Paramasivam, S, Sajwan, K.S
• Format: Article
• Language: English
• Subjects: Adsorption; Adsorption isotherms; agricultural soils; Agronomy. Soil science and plant productions; animal manures; Batch equilibrium technique; Biological and medical sciences; Competitive adsorption; copper; Copper - analysis; Copper - chemistry; Copper - pharmacokinetics; desorption; fertilizer rates; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; heavy metals; Incineration; Industrial by-products; Kinetics; Manure - analysis; Metal-ligand complexes; organic fertilizers; Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries; sandy soils; Sewage - analysis; Sewage - chemistry; sewage sludge; Soil - analysis; Soil amendments; Soil carbon; Soil Pollutants - analysis; soil pollution; Soil-plant relationships. Soil fertility. Fertilization. Amendments; sorption isotherms
• ISSN: 0360-1234; 1532-4109
• DOI: 10.1081/PFC-200061601

Organic amendments are sometimes applied to agricultural soils to improve the physical, chemical, and microbiological properties of the soils. The organic fractions in these soil amendments also influence metal reaction, particularly the adsorption and desorption of metals, which, in turn, determine the bioavailability of the metals and hence their phytotoxicities. In this study, a Quincy fine sandy (mixed, mesic, Xeric Torripsamments) soil was treated with 0 to 160 g kg −1 rates of either manure, sewage sludge (SS), or incinerated sewage sludge (ISS) and equilibrated in a greenhouse at near field capacity moisture content for 100 days. Following the incubation period, the soil was dried and adsorption of copper (Cu) was evaluated in a batch equilibration study at either 0, 100, 200, or 400 mg L −1 Cu concentrations in a 0.01M CaCl 2 solution. The desorption of adsorbed Cu was evaluated by three successive elutions in 0.01M CaCl 2 . Copper adsorption increased with an increase in manure rates. At the highest rate of manure addition (160 g kg −1 soil), Cu adsorption was two-fold greater than that by the unamended soil at all rates of Cu additions. With increasing rates of Cu additions, the adsorption of Cu decreased from 99.4 to 77.6% of Cu applied to the 160 g kg −1 manure amended soil. The desorption of Cu decreased with an increase in rate of manure amendment. Effects of sewage sludge amendments on Cu adsorption were somewhat similar to those as described for manure additions. Likewise, the desorption of Cu was the least at the high rate of SS addition (160 g kg −1 ), although at the lower rates there was not a clear indication of the rate effects. In contrast to the above two amendments, the ISS amendment had the least effect on Cu adsorption. At the highest rate of ISS amendment, the Cu adsorption was roughly 50% of that at the similar rate of either manure or SS amendments, across all Cu rates.