پیوندهای مفید
اخبار و اعلانات
آمار
| تعداد نشریات | 161 |
| تعداد شماره‌ها | 6,532 |
| تعداد مقالات | 70,502 |
| تعداد مشاهده مقاله | 124,118,194 |
| تعداد دریافت فایل اصل مقاله | 97,224,064 |
هم‌دماهای جذب سطحی و رهاسازی بور روی کلسایت: اثر قدرت یونی و pH محلول | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 11، دوره 45، شماره 3، آذر 1393، صفحه 345-351 اصل مقاله (403.32 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2014.52199 | ||
| نویسندگان | ||
| عزیز مجیدی1؛ رسول راهنمایی* 2؛ محمد جعفر ملکوتی3 | ||
| 1دانشجوی سابق دکتری دانشکدة کشاورزی دانشگاه تربیت مدرس | ||
| 2استادیار دانشکدة کشاورزی دانشگاه تربیت مدرس | ||
| 3استاد دانشکدة کشاورزی دانشگاه تربیت مدرس | ||
| چکیده | ||
| به منظور تبیین نقش کلسایت در رفتار شیمیایی بور در خاک‌های آهکی، جذب سطحی و رهاسازی بور روی کلسایت در چهار نسبت فاز جامد به محلول، در سه سطح قدرت یونی و در محدودة pH 5/7 تا 5/11 بررسی شد. داده‌های آزمایشی نشان داد جذب سطحی بور با افزایش نسبت فاز جامد به محلول و با افزایش غلظت تعادلی بور افزایش می‌یابد. همچنین افزایش قدرت یونی موجب افزایش جذب سطحی بور شد که احتمالاً ناشی از مکانیزم جذب سطحی درون‌کره‌ای بور و کاهش ضخامت لایة دوگانة الکتریکی است. جذب سطحی بور با افزایش pH افزایش یافت و در pH 2/9 به حداکثر رسید. افزایش مجدد pH موجب کاهش جذب سطحی شد. چهار مرحلة متوالی عصاره‌گیری با محلول زمینة نیترات کلسیم موجب رهاسازی حدود 20 تا 40 درصد از بور جذب‌سطحی‌شده شد. به طور کلی، نتایج نشان داد اگرچه کلسایت کانی غالب خاک‌های آهکی است، نقش ضعیفی در کنترل غلظت بور در فاز محلول دارد. | ||
| کلیدواژه‌ها | ||
| خاک آهکی؛ رفتار شیمیایی؛ لایة دوگانه؛ محلول خاک | ||
| عنوان مقاله [English] | ||
| Isotherms of Adsorption on and Desorption from Calcite of Boron: pH and Salt Dependency | ||
| نویسندگان [English] | ||
| AZIZ MAJIDI1؛ RASOUL RAHNEMAIE2؛ MOHAMMAD JAFAR MALAKOUTI3 | ||
| 1Former Ph.D. student, Faculty of Agriculture, Department of Soil Science, Tarbiat Modares University | ||
| 2assistant professor, Faculty of Agriculture, Department of Soil Science, Tarbiat Modares University | ||
| 3professor, Faculty of Agriculture, Department of Soil Science, Tarbiat Modares University | ||
| چکیده [English] | ||
| The role of calcite as related to the chemical behavior of boron (B) in calcareous soils was investigated through an assessment of B adsorption and desorption reactions on and from calcite in four ratios of solid to solution rate, three levels of ionic strength, and within a pH range of 7.5 to 11.5. Experimental data indicated that B adsorption is increased by an increase in the solid to solution ratio and by increase in its equilibrium concentration. Further, an increase in ionic strength strongly stimulated B adsorption, which is likely due to the formation of boron inner-sphere surface complexes and as well shrinkage in the electrical double layer thicknesses. Boron adsorption increased by increase in pH getting maximized at about 9.2. Any further increase in pH reduced B adsorption. After four successive desorption stages with calcium nitrate as background solution, approximately 20-40% of the initially adsorbed B was released. In general, it could be concluded that even though calcite is the major mineral in calcareous soils, however, boron-calcite adsorption interactions influence B concentration in the soil solution as by weakly. | ||
| کلیدواژه‌ها [English] | ||
| Calcareous soil, Double layer, Soil solution, Chemical behavior | ||
| مراجع | ||
|
Alexandratos, V. G., Elzinga, E. J., and Reeder, R. J. (2007). Arsenate uptake by calcite: Macroscopic and spectroscopic characterization of adsorption and incorporation mechanisms. Geochimica et Cosmochimica Acta, 71(17), 4172-4187. Bingham, F. T. (1982). Boron. In: Page, A. L. (Ed.), Methods of Soil Analysis. ASA, SSSA, Inc, Madison, WI, pp. 431–447. Donner, H. E. and Grossl, P. R. (2002). Carbonates and evaporates. J. B. Dixon (Ed.). Soil mineralogy with enviromental applications Madison, Wisconsin, USA, Soil Science Society of America, Inc. Elrashidi, M. A. and O'Connor, G. A. (1982). Boron sorption and desorption in soils. Soil Science Society of America Journal, 46(1), 27-31. Eriksson, R., Merta, J., and Rosenholm, J. B. (2007). The calcite/ water interface 1. Surface charge in indifferent electrolyte media and influence of low molecular-weight polyelectrolyte. Journal of Colloid and Interface Science, 313, 184-193. Eriksson, R., Merta, J., and Rosenholm, J. B. (2008). The calcite/water interface 2. Effect of added lattice ions on the charge properties and adsorption of sodium polyacrylate. Journal of Colloid and Interface Science, 326, 396-402. Essington, M. E. (2004). Soil and water chemistry. Boca Raton, Florida, CRC Press. Goldberg, S. (1993). Chemistry and mineralogy of boron in soils. U. C. Gupta (Ed.). Boron and its role in crop production. (344) Boca Raton, USA, CRC Press. Goldberg, S. (1997). Reactions of boron with soils. Plant And Soil, 193(1-2), 35-48. Goldberg, S. and Forster, H. S. (1991). Boron sorption on calcareous soils and reference calcites. Soil Science, 152(4), 304-310. Goli, E., Rahnemaie, R., Hiemstra, T., and Malakouti, M. J. (2011). The interaction of boron with goethite: Experiments and cd-music modeling. Chemosphere, 82(10), 1475-1481. Hassani, A., Rahnemaie, R., and Malakouti, M. J. (2011). Effect of calcium carbonate and ionic strength on boron adsorption in calcareous soils. Iranian Journal of Soil Research, 24(2), 117-126, (In Farsi). Hiemstra, T., Barnett, M. O., and van Riemsdijk, W. H. (2007). Interaction of silicic acid with goethite. Journal of Colloid and Interface Science, 310, 8-17. Keren, R. and Sparks, D. L. (1994). Effects of ph and ionic strength on boron adsorption by pyrophyllite. Soil Science Society of America Journal, 58, 1095-1100. Kosmulski, M. (2009). Ph-dependentsurface charging and points of zero charge. 5. Update and new approach. Journal of Colloid and Interface Science, 337, 439-448. Ma, L., Southwick, L. M., Willis, G. H., and Selim, H. M. (1993). Hysteresis characteristics of atrazine adsorption-desorption by a Sharkey soil. Weed Science, 41, 627-633. Majidi, A. and Malakouti, M. J. (2007). Study of boron toxicity in fruits gardens near uremia lake. Tehran, Iran, Department of Soil Science, Tarbiat Modares University , (In Farsi). Majidi, A., Rahnemaie, R., Hassani, A., and Malakouti, M. J. (2010). Adsorption and desorption processes of boron in calcareous soils. Chemosphere, 80(7), 733-739. Manning, B. A. and Goldberg, S. (1996). Modeling arsenate competitive adsorption on kaolinite, montmorillonite and illite. Clays and Clay Minerals, 44, 609-623. Opiso, E., Sato, T., and Yoneda, T. (2009). Adsorption and co-precipitation behavior of arsenate, chromate, selenate and boric acid with synthetic allophane-like materials. Journal of Hazardous Materials, 170(1), 79-86. Oscarson, D. W. and Hume, H. B. (1998). Effect of the solid/liquid ratio on the sorption of sr2+ and cs2+ on bentonite. E. A. Jenne (Ed.). Adsorption of metals by geomedia: Variables, mechanisms and model applications San Diego, USA, Academic Press. Rahnemaie, R., Hiemstra, T., and van Riemsdijk, W. H. (2006). A new surface structural approach to ion adsorption: Tracing the location of electrolyte ions. Journal of Colloid and Interface Science, 293(2), 312-321. Rahnemaie, R., Hiemstra, T., and van Riemsdijk, W. H. (2007). Geometry, charge distribution, and surface speciation of phosphate on goethite. Langmuir, 23, 3680-3689. Rashid, A. (2006). Boron deficiency in soils and crops of pakistan, diagnosis and managment. Islamabad, Pakistan, Pakistan Agricultural Research Council. Shirvani, M., Kalbasi, M., Shariatmadari, H., Nourbakhsh, F., and Najafi, B. (2006). Sorption-desorption of cadmium in aqueous palygorskite, sepiolite, and calcite suspensions: Isotherm hysteresis. Chemosphere, 65, 2178-2184. Sposito, G. (1982). On the use of the Langmuir equation in interpretation of "adsorption" phenomena: 2. The " two-surface" langmuir equation. Soil Science Society of America Journal, 46, 1147-1152. Su, C. and Suarez, D. L. (1995). Coordination of adsorbed boron: A FTIR spectroscopic study. Environmental Science and Technology, 29, 302-311. Xu, D. N. and Peak, D. (2007). Adsorption of boric acid on pure and humic acid coated am-Al(OH)(3): A boron K-edge XANES study. Environmental Science & Technology, 41(3), 903-908. | ||
|
آمار تعداد مشاهده مقاله: 2,157 تعداد دریافت فایل اصل مقاله: 1,179 |
||