| Effects of different type fertilizers on the adsorption and desorption of heavy metals in the lou soil |
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| DOI：10.7606/j.issn.1000-7601.2016.04.22 |
| Key Words: fertilizer lou soil Pb Cd absorption desorption |
| Author Name | Affiliation | | HE Jing-zhe | College of Resource and Environmental Science, Northwest A & F University, Yangling, Shaanxi 712100, China | | SUN Hui-min | College of Resource and Environmental Science, Northwest A & F University, Yangling, Shaanxi 712100, China | | JIANG Yan-ji | College of Resource and Environmental Science, Northwest A & F University, Yangling, Shaanxi 712100, China | | XIE Bing-yi | College of Resource and Environmental Science, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To investigate the effects on absorption characteristics of heavy metals including Pb and Cd by applications of five different fertilizers, an experiment was carried out by studying the absorption of Pd and Cd by Lou soil. The experimental results showed that during the adsorption process, applications of different fertilizers could change the adsorption capacity of Cd, but had little influence on Pb. Langmuir model fitted well on the adsorption isotherm of Pb2+; but for the adsorption isotherm of Cd2+, both Freundlich model and Langmuir model were favorable. According to the maximum adsorption capacity obtained by the Langmuir model, the application of fertilizers inhibited the adsorption of Pb and Cd except that KH2PO4 promoted the adsorption of Cd. During the desorption process, fertilizers could significantly affect the desorption of Pb and phosphate fertilizers could increase the desorption rate even up to 90%. Since applying fertilizers into soil could affect the adsorption and desorption of Pb and Cd, selection of phosphate fertilizers needs to be carefully implemented in order to avoid harms towards crops through the migration of Pb and Cd when tilling in the fields polluted by Pb and Cd. |
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