Effect of citric acid on metals mobility in pruning wastes and biosolids compost and metals uptake in Atriplex halimus and Rosmarinus officinalis

• Published in: Environmental monitoring and assessment 2013-05, Vol.185 (5), p.4221-4229
• Main Authors: Tapia, Y., Eymar, E., Gárate, A., Masaguer, A.
• Format: Article
• Language: English
• Subjects: Acids; Agriculture; Agronomy. Soil science and plant productions; Applied sciences; Atmospheric Protection/Air Quality Control/Air Pollution; Atriplex - metabolism; Atriplex halimus; Biological and medical sciences; Bioremediation; Biosolids; Cadmium; Carbon; Chelating agents; Citric Acid - chemistry; Composting; Composts; Cropping systems. Cultivation. Soil tillage; Earth and Environmental Science; Ecology; Ecotoxicology; Environment; Environmental Management; Environmental monitoring; Environmental Restoration and Remediation - methods; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Humification; Hydrogen-Ion Concentration; Kinetics; Lead; Metal concentrations; Metals; Metals - analysis; Metals - chemistry; Metals - metabolism; Models, Chemical; Monitoring/Environmental Analysis; Municipal solid waste; Nutrient concentrations; Nutrition; Organic matter; Other industrial wastes. Sewage sludge; Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries; Plant nutrition; Pollution; Rosmarinus - metabolism; Rosmarinus officinalis; Sewage irrigation; Sludge; Soil - chemistry; Soil Pollutants - analysis; Soil Pollutants - chemistry; Soil Pollutants - metabolism; Soil-plant relationships. Soil fertility. Fertilization. Amendments; Studies; Tending. Growth control; Tillage. Tending. Growth control; Use of agricultural and forest wastes. Biomass use, bioconversion; Wastes
• ISSN: 0167-6369; 1573-2959
• DOI: 10.1007/s10661-012-2863-y

To assess metal mobility in pruning waste and biosolids compost (pH 6.9 and total concentration of metals in milligram per kilogram of Cd 1.9, Cu 132, Fe 8,513, Mn 192, Pb 81, and Zn 313), shrubs species Atriplex halimus and Rosmarinus officinalis were transplanted in this substrate and irrigated with citric acid (4 g L −1 , pH 2.9) and nutrient solution daily for 60 days. Citric acid significantly increased the concentrations of soluble Mn and Fe in the nutrient substrate solution measured by suction probes, while other metals did not vary in concentration (Cu and Zn) or were not observed at detectable levels (Cd and Pb). In plants, citric acid significantly increased the concentrations of Cu (2.7 ± 0.1–3.3 ± 0.1 mg kg −1 ), Fe (49.2 ± 5.2–76.8 ± 6.8 mg kg −1 ), and Mn (7.2 ± 1.1–11.4 ± 0.7 mg kg −1 ) in leaves of R. officinalis , whereas the concentration of only Mn (25.4 ± 0.3–42.2 ± 2.9 mg kg −1 ) was increased in A. halimus . Increasing Fe and Mn solubility by citric acid addition indicates the possibility of using it to improve plant nutrition. The mobility of metals in this substrate was influenced for the concentration of the metal, the degree of humification of organic matter and its high Fe content.