Application of Langmuir Isotherms to Describe Zinc and Copper Adsorption in Some Gypsiferous Soils
This study aims to evaluate and compare the adsorption behavior of copper and zinc in some gypsiferous soils using the linearization methods of the Langmuir equation. Six surface soil samples were taken from three different sites in Salah al-Din and Najaf governorates. Coefficient of determination (...
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University of Diyala
2025-06-01
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| Series: | مجلة ديالى للعلوم الزراعية |
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| Online Access: | https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/10281 |
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| author | Mahmood Ahmed L. Al-Bayati Yasir Hmood Ijresh AL-janabi Basim Shakir Obaid AL-Obaidi |
| author_facet | Mahmood Ahmed L. Al-Bayati Yasir Hmood Ijresh AL-janabi Basim Shakir Obaid AL-Obaidi |
| author_sort | Mahmood Ahmed L. Al-Bayati |
| collection | DOAJ |
| description | This study aims to evaluate and compare the adsorption behavior of copper and zinc in some gypsiferous soils using the linearization methods of the Langmuir equation. Six surface soil samples were taken from three different sites in Salah al-Din and Najaf governorates. Coefficient of determination (R²) was high for both ions, except for zinc in Salah al-Din site T3. Langmuir equation constants showed maximum adsorption values (b) higher for copper than zinc, reaching 476.19 mg kg-1 in Salah al-Din site T3 and 1666.66 mg kg-1 in Najaf site N3. Zinc's highest values were 181.81 mg kg-1 in Salah al-Din site T2 and 666.66 mg kg-1 in Najaf N3. The results indicated that the high maximum adsorption values (b) for both ions are associated with a relatively low binding energy (k). The results also confirmed that copper ions had much lower binding energy values than zinc ions, with copper at 15 L mg-1 in Salah al-Din site T1 soil and 4 L mg-1 in Najaf site N2 soil. In contrast, zinc showed higher binding energy, with 122.54 L mg-1 in Salah al-Din T3 and 143.33 L mg-1 in Najaf N1. Copper’s distribution coefficient values are generally higher than zinc’s, except in Salah al-Din T3 and Najaf N1 soils. The results regarding the constants of the Langmuir equation for both ions indicated that the maximum adsorption value (b) indicates the soil's capacity to adsorb metals. Thus, the soil has a higher affinity for copper than for zinc. |
| format | Article |
| id | doaj-art-42e69637671a4a74bfb2834bd8a60cba |
| institution | Kabale University |
| issn | 2073-9524 2310-8746 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | University of Diyala |
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| series | مجلة ديالى للعلوم الزراعية |
| spelling | doaj-art-42e69637671a4a74bfb2834bd8a60cba2025-08-20T03:28:56ZengUniversity of Diyalaمجلة ديالى للعلوم الزراعية2073-95242310-87462025-06-0117114015310.52951/dasj.25170111Application of Langmuir Isotherms to Describe Zinc and Copper Adsorption in Some Gypsiferous SoilsMahmood Ahmed L. Al-Bayati0https://orcid.org/0000-0001-5400-9180Yasir Hmood Ijresh AL-janabi1https://orcid.org/0000-0003-0229-835XBasim Shakir Obaid AL-Obaidi2https://orcid.org/0000-0003-3274-1754Department of Soil Science and Water Resources, College of Agriculture, University of Tikrit, IraqDepartment of Soil Science and Water Resources, College of Agriculture, University of Tikrit, IraqDepartment of Soil Science and Water Resources, College of Agriculture, University of Tikrit, IraqThis study aims to evaluate and compare the adsorption behavior of copper and zinc in some gypsiferous soils using the linearization methods of the Langmuir equation. Six surface soil samples were taken from three different sites in Salah al-Din and Najaf governorates. Coefficient of determination (R²) was high for both ions, except for zinc in Salah al-Din site T3. Langmuir equation constants showed maximum adsorption values (b) higher for copper than zinc, reaching 476.19 mg kg-1 in Salah al-Din site T3 and 1666.66 mg kg-1 in Najaf site N3. Zinc's highest values were 181.81 mg kg-1 in Salah al-Din site T2 and 666.66 mg kg-1 in Najaf N3. The results indicated that the high maximum adsorption values (b) for both ions are associated with a relatively low binding energy (k). The results also confirmed that copper ions had much lower binding energy values than zinc ions, with copper at 15 L mg-1 in Salah al-Din site T1 soil and 4 L mg-1 in Najaf site N2 soil. In contrast, zinc showed higher binding energy, with 122.54 L mg-1 in Salah al-Din T3 and 143.33 L mg-1 in Najaf N1. Copper’s distribution coefficient values are generally higher than zinc’s, except in Salah al-Din T3 and Najaf N1 soils. The results regarding the constants of the Langmuir equation for both ions indicated that the maximum adsorption value (b) indicates the soil's capacity to adsorb metals. Thus, the soil has a higher affinity for copper than for zinc.https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/10281trace elementadsorptiondesorptionisotherm equations |
| spellingShingle | Mahmood Ahmed L. Al-Bayati Yasir Hmood Ijresh AL-janabi Basim Shakir Obaid AL-Obaidi Application of Langmuir Isotherms to Describe Zinc and Copper Adsorption in Some Gypsiferous Soils مجلة ديالى للعلوم الزراعية trace element adsorption desorption isotherm equations |
| title | Application of Langmuir Isotherms to Describe Zinc and Copper Adsorption in Some Gypsiferous Soils |
| title_full | Application of Langmuir Isotherms to Describe Zinc and Copper Adsorption in Some Gypsiferous Soils |
| title_fullStr | Application of Langmuir Isotherms to Describe Zinc and Copper Adsorption in Some Gypsiferous Soils |
| title_full_unstemmed | Application of Langmuir Isotherms to Describe Zinc and Copper Adsorption in Some Gypsiferous Soils |
| title_short | Application of Langmuir Isotherms to Describe Zinc and Copper Adsorption in Some Gypsiferous Soils |
| title_sort | application of langmuir isotherms to describe zinc and copper adsorption in some gypsiferous soils |
| topic | trace element adsorption desorption isotherm equations |
| url | https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/10281 |
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