25 Total and EDTA-extractable concentrations of Cd, Co, Cu, Ni, Pb, and Zn in rice-farming 26 soils and their distribution in the profile depth were evaluated. The temporal variability of 27 metal concentrations in the superficial horizon was studied during 1991-1995. Results show 28 that the highest metal concentrations correspond to Zn, Pb, and Cu, for total and EDTA29 extractable fraction. I...

this research was conducted on polluted soil near the lead and zinc factory in zanjan province through which the effects of two organic and three mineral sources were examined on heavy metals fixation in randomized experiment design. experimental treatments includes bagasse and rice husk in three levels: 1.25, 2.5 and 5%, zeolite in three levels: 5%, 10% and 15%, phosphate rock in three rates: ...

to evaluate the effect of application of municipal solid waste compost (mswc) on the accumulation of heavy metals of lead, nickel and cadmium in the soil under maize cultivation, a factorial experiment in base randomized complete block design (rcbd) with four different amounts of municipal solid waste compost (zero, 15, 30 and 60 tons ha-1) and time (compost applied once or twice) was performed...

Fly ash was collected as a byproduct from the processing of southern pine wood chips in a pilot-scale biomass gasifier. General properties of the fly ash were determined to assess its applicability as a soil amendment. Its alkaline pH (9.5) and high concentrations of Ca, K, and Mg suggest that it could be used as both a liming agent and a fertilizer. The concentrations of most heavy metals in a...

Title of Document: USE OF INORGANIC BY-PRODUCT AMENDED COMPOST/MANURE TO SEQUESTER METALS AND PHOSPHORUS FROM DIFFUSE SOURCE POLLUTION Hunho Kim, Doctor of Philosophy, 2010 Directed By: Professor, Allen P. Davis, Department of Civil and Environmental Engineering. Research Scientist, Rufus L. Chaney, ARS, US Department of Agriculture. Heavy metals and nutrients released from diffuse sources by u...

The effect of temperature changes (10 to 80 degrees C) on water-extractable metal (Zn, Cu, Cd and Pb) concentrations of composted wastes of Nigerian origin was investigated in batch extraction experiments. Metal concentrations were measured using a calibrated atomic absorption spectrophometer after acid digestions. Results showed that the water-extractable metal fractions (I) did not exceed 10%...

This study compared the extractability of Cd, Cu, Ni, Pb, and Zn by 8 extraction protocols for 22 representative rural soils in Taiwan and correlated the extractable amounts of the metals with their uptake by Chinese cabbage for developing an empirical model to predict metal phytoavailability based on soil properties. Chemical agents in these protocols included dilute acids, neutral salts, and ...

Single extractions with distilled water and diethylene-triamine-pentaacetic acid (DTPA), and a sequential extraction procedure were conducted in this study to determine the chemical speciation of Cd, Cr, Cu, Ni, Pb and Zn in four municipal sewage sludges and subsequently evaluate the phytotoxicity of the metals by a seed germination test of Chinese cabbage (Brassica chinensis L.). Analytical re...

Purpose. Attapulgite was modified by sodium dihydrogen phosphate, oxalic acid-activated phosphate rock powder, potassium calcium superphosphate, ammonium and fused calcium-magnesium used in the remediation of Cd, Zn, Ni. Materials Methods. six kinds (ratio: 1 : 2), improvement effect passivation material on soil polluted cadmium, zinc, nickel determined. CaCl2-extractable toxicity characteristi...