Please use this identifier to cite or link to this item:
Title: Applications of citric acid industrial wastewater and phosphonates for soil remediation : effects on temporal change of cadmium distribution
Authors: Gu, YY
Yeung, AT
Tsang, DCW 
Fu, RB
Keywords: Citric acid industrial wastewater
Metal distribution
Soil remediation
Issue Date: 2013
Publisher: Taylor & Francis Inc
Source: Soil and sediment contamination, 2013, v. 22, no. 8, p. 876-889 How to cite?
Journal: Soil and Sediment Contamination 
Abstract: Citric acid industrial wastewater (CAIW) and phosphonates are potentially useful for enhancing remediation of metal-contaminated soil. This study aimed to investigate the effects of these enhancement agents on temporal change of Cd distribution in a clayey soil, which probably correlates with the metal lability and bioavailability in the environment. Sequential extractions were performed on the soil samples from batch desorption experiments between 5 and 4320 min. The CAIW primarily enhanced Cd extraction from weakly bound fractions (i.e., exchangeable and carbonate fractions), which was relatively fast and took place in the first 60 min. On the other hand, (nitrilotrimethylene)-triphosphonic acid (NTMP) and ethylene diaminetetra-methylenephosphonic acid (EDTMP) provided a more significant Cd extraction from exchangeable, carbonate, and oxide fractions, with the change of Cd distribution occurring over the first 300 min. The differences in the extent and temporal change of metal extraction reflected the weaker complexation strength of CAIW compared to that of NTMP and EDTMP. Moreover, an increase of pH from 4 to 10 shifted the remaining Cd from exchangeable fraction to carbonate and oxide fractions. These distribution changes indicated that both CAIW and phosphonates were efficient at removing weakly bound Cd fractions in a short period of time, but alkaline conditions could hinder their effectiveness.
ISSN: 1532-0383
DOI: 10.1080/15320383.2013.739216
Appears in Collections:Journal/Magazine Article

View full-text via PolyU eLinks SFX Query
Show full item record


Citations as of Feb 20, 2017


Last Week
Last month
Citations as of Feb 21, 2017

Page view(s)

Last Week
Last month
Checked on Feb 19, 2017

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.