Simultaneous extraction of soil phytoavailable cadmium, copper, and lead by chelating resin membrane

Abstract

Cadmium, copper, and lead were extracted from suspensions of contaminated soils using metal chelating exchange resin membranes. Nine soils with widely varying properties and Cd, Cu and Pb levels were tested. Soil suspensions made up with 4 g in 40 mL deionized water were equilibrated with 5 cm 2 Ca-saturated Chelex exchange resin membrane which was retained inside a polypropylene bag and shaken at 150 rpm for 24 hrs. Resin membrane extractable Cd, Cu and Pb of the soils were correlated with Cd, Cu, and Pb uptake by young wheat seedlings grown in these soils and compared with soil Cd, Cu, and Pb extracted by 0.1 M HC1, 0.01 M CaCI2, and 0.005 M Diethylenetriamine pentaacetic acid (DTPA). The amounts of Cd, Cu and Pb extracted by the Ca-saturated Chelex membrane from all tested soils correlated well with those absorbed by young wheat seedlings. The Ca-saturated Chelex membrane extractable Cd, Cu and Pb of the soil had the strongest correlation with plant uptake Cd, Cu and Pb among the extraction methods we tested. It was demonstrated that the Ca-saturated Chelex membrane extraction is an appropriate method in simultaneously estimating Cd, Cu and Pb phytoavailability of soil and is applicable to a wide range of soils.

Phytoavailability of Lead (Pb) for Corn and Sunflower as Affected by Pb-enriched Sewage Sludge and Cow Manure

“…Several experiments such as the ion exchange resins have used for determination of free ion and different species of metals in soil solution [17]. Khoshgftarmanesh et al (2006) found significant correlation relationship between MINTEQA2 model and Amberlite resin to estimate soluble concentrations of the Cd 2+ and Zn 2+ ions in soil [4].…”

“…Khoshgftarmanesh et al (2006) found significant correlation relationship between MINTEQA2 model and Amberlite resin to estimate soluble concentrations of the Cd 2+ and Zn 2+ ions in soil [4]. Significant relationship between the Amberlite resin and MINTEQA2 calculated free Zn 2+ and Cd 2+ showed that the MINTEQA2 model is appropriate for estimation of soluble Zn 2+ and Cd 2+ [17]. The resins can also be used for extraction of available metal pools in soil [17].…”

“…Significant relationship between the Amberlite resin and MINTEQA2 calculated free Zn 2+ and Cd 2+ showed that the MINTEQA2 model is appropriate for estimation of soluble Zn 2+ and Cd 2+ [17]. The resins can also be used for extraction of available metal pools in soil [17].…”

“…Chelating exchange resins are better than ion exchange resins for extraction of available pools of metals from soil [17]. Lee and Zheng (1994) reported the Ca-saturated Chelex membrane can easily be used for simultaneously extraction of soil available Cd, Cu and Pb in a wide range of soils [17].…”

“…Lee and Zheng (1994) reported the Ca-saturated Chelex membrane can easily be used for simultaneously extraction of soil available Cd, Cu and Pb in a wide range of soils [17].…”