S, Zn, Cr, Cu and Fe changes during fluvial sediments oxidation
Acidification of dredged sediments which have been disposed on land is highly dependent on redox shifts. The aim of the present work was to assess changes in sulphur, metal speciation (Zn, Fe, Cr y Cu) and acidity caused by a polluted sediment oxidation event. Sediments were dessicated under control...
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Asociación Argentina de la Ciencia del Suelo
2009-12-01
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| Series: | Ciencia del Suelo |
| Subjects: | |
| Online Access: | http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1850-20672009000200006&lng=en&tlng=en |
| _version_ | 1818892160277151744 |
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| author | María Pía Di Nanno Gustavo Curutchet Silvia E Ratto |
| author_facet | María Pía Di Nanno Gustavo Curutchet Silvia E Ratto |
| author_sort | María Pía Di Nanno |
| collection | DOAJ |
| description | Acidification of dredged sediments which have been disposed on land is highly dependent on redox shifts. The aim of the present work was to assess changes in sulphur, metal speciation (Zn, Fe, Cr y Cu) and acidity caused by a polluted sediment oxidation event. Sediments were dessicated under controlled conditions and sulphide compounds (acid volatile sulphides-AVS- and sulphate), pH and neutralization potential were measured through time during 36 days. Zinc, Cu, Cr and Fe speciation (BCR metal sequential extraction procedure) were measured at the beginning of the experiment and at day 22. An acid-base equilibrium method based on the BCR procedure was employed to assess the sediment acidification risk. Some of the re-suspension experiments were inoculated with an Acidithiobacillus ferrooxidans strain to assess biological catalysis on sulphide oxidation. Acid-base equilibrium results indicated the sediment sample had a significant acidification potential. Oxidation increased sulphate levels (56 to 2300 mg S kg-¹ in the desiccation experiment with a temporal evolution adjusted by a logistic model, and a 2100 to 3000 mg SO4 -² L-¹ increase for the resuspension experiments). Sulphide oxidation rates varied between 0 to 3.1.10-9 mg O2 kg-¹ s-¹ for the drying sediment. Zinc changes could be explained partially by ZnS conversion to ZnSO4 during oxidation. Iron reduction could be attributed to an increase in Fe oxides crystallinity. Acid-base equilibrium for the sample indicated it was a potentially acid-generating material. Zinc increased its bioavailability during drying and was the only metal that appeared in significant amounts in solution during re-suspension. Land-filling with dredged sediments could present increased metals bioavailability problems despite having an important and effective neutralization potential. |
| first_indexed | 2024-12-19T17:52:17Z |
| format | Article |
| id | doaj.art-7a28d71a413943ec8183dff93060e1e3 |
| institution | Directory Open Access Journal |
| issn | 1850-2067 |
| language | English |
| last_indexed | 2024-12-19T17:52:17Z |
| publishDate | 2009-12-01 |
| publisher | Asociación Argentina de la Ciencia del Suelo |
| record_format | Article |
| series | Ciencia del Suelo |
| spelling | doaj.art-7a28d71a413943ec8183dff93060e1e32022-12-21T20:11:53ZengAsociación Argentina de la Ciencia del SueloCiencia del Suelo1850-20672009-12-01272199207S, Zn, Cr, Cu and Fe changes during fluvial sediments oxidationMaría Pía Di Nanno0Gustavo Curutchet1Silvia E Ratto2Universidad de San MartínUniversidad de San MartínUniversidad de Buenos AiresAcidification of dredged sediments which have been disposed on land is highly dependent on redox shifts. The aim of the present work was to assess changes in sulphur, metal speciation (Zn, Fe, Cr y Cu) and acidity caused by a polluted sediment oxidation event. Sediments were dessicated under controlled conditions and sulphide compounds (acid volatile sulphides-AVS- and sulphate), pH and neutralization potential were measured through time during 36 days. Zinc, Cu, Cr and Fe speciation (BCR metal sequential extraction procedure) were measured at the beginning of the experiment and at day 22. An acid-base equilibrium method based on the BCR procedure was employed to assess the sediment acidification risk. Some of the re-suspension experiments were inoculated with an Acidithiobacillus ferrooxidans strain to assess biological catalysis on sulphide oxidation. Acid-base equilibrium results indicated the sediment sample had a significant acidification potential. Oxidation increased sulphate levels (56 to 2300 mg S kg-¹ in the desiccation experiment with a temporal evolution adjusted by a logistic model, and a 2100 to 3000 mg SO4 -² L-¹ increase for the resuspension experiments). Sulphide oxidation rates varied between 0 to 3.1.10-9 mg O2 kg-¹ s-¹ for the drying sediment. Zinc changes could be explained partially by ZnS conversion to ZnSO4 during oxidation. Iron reduction could be attributed to an increase in Fe oxides crystallinity. Acid-base equilibrium for the sample indicated it was a potentially acid-generating material. Zinc increased its bioavailability during drying and was the only metal that appeared in significant amounts in solution during re-suspension. Land-filling with dredged sediments could present increased metals bioavailability problems despite having an important and effective neutralization potential.http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1850-20672009000200006&lng=en&tlng=enAnaerobic sedimentsBCR sequential chemical extractionDesiccationDredged sedimentsFluvial sedimentsHeavy metalsRe-suspension |
| spellingShingle | María Pía Di Nanno Gustavo Curutchet Silvia E Ratto S, Zn, Cr, Cu and Fe changes during fluvial sediments oxidation Ciencia del Suelo Anaerobic sediments BCR sequential chemical extraction Desiccation Dredged sediments Fluvial sediments Heavy metals Re-suspension |
| title | S, Zn, Cr, Cu and Fe changes during fluvial sediments oxidation |
| title_full | S, Zn, Cr, Cu and Fe changes during fluvial sediments oxidation |
| title_fullStr | S, Zn, Cr, Cu and Fe changes during fluvial sediments oxidation |
| title_full_unstemmed | S, Zn, Cr, Cu and Fe changes during fluvial sediments oxidation |
| title_short | S, Zn, Cr, Cu and Fe changes during fluvial sediments oxidation |
| title_sort | s zn cr cu and fe changes during fluvial sediments oxidation |
| topic | Anaerobic sediments BCR sequential chemical extraction Desiccation Dredged sediments Fluvial sediments Heavy metals Re-suspension |
| url | http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1850-20672009000200006&lng=en&tlng=en |
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