Adsorption and desorption of heavy metals is one of conseqential processes in soil chemistry. Cla... more Adsorption and desorption of heavy metals is one of conseqential processes in soil chemistry. Clay minerals, iron and manganese oxides and soil organic compounds have considerable effect on these processes. The aim of this study was comparison of leonardite effect on adsorption/desorption reactions of heavy metals in three soils different in parent materials. Surface soil samples were collected from different soil parent materials including Calcite, Siyenite and Gabro derived in Akpınar-Kırşehir province located in the central of Anatolia Turkey. Soil physical and chemical properties were determined through standard methods, clay mineralogy characteristic identified by X-ray diffraction method (XRD). Adsorption/desorption reactions of Lead (Pb) and Zinc (Zn) were done in three leonardite levels including 0%, 2% and 5%. Adsorption data was prepared using Pb (NO3)2 and Zn (NO3)2 with concentration between 100-1200 mgl-1 and 25-400 mgl-1, respectively. Also desorption studies were carr...
This study was carried out to determine effects of soil properties on Zn adsorption. For this pur... more This study was carried out to determine effects of soil properties on Zn adsorption. For this purpose, soils with different clay and lime contents were selected. The types of clay in soils were also analysed and found that Mica/Illite, Kaolinite, Smectite and Chlorite type clays were generally dominant. For Zn adsorption, different concentrations of Zn solution (0, 50, 100, 150, 200, 250,300, 350 and 400 mg Zn l-1) were added to the soil samples and the samples were kept to reach the equilibrium state within 24 hours. It was found that the Zn adsorption properties of soils conformed to the Langmuir and Freundlich isotherms and according to the variance analysis performed on the data, R 2 values were generally found to be P<0.001. According to correlation analyses, statistically significant relationships were found at (P<0.001) level between the k l value calculated in the Langmuir model, and CEC and the percent clay content. In Freundlich isotherms, however, statistically sign...
The aim of this study was the effected of leonardite on kinetics desorption of heavy metals in so... more The aim of this study was the effected of leonardite on kinetics desorption of heavy metals in soils formed from different parent materials including Syenite, Siyenit-Calcite, Schist and Gabbros rocks. Leonardite is a rich source of humic and fulvic acid and act as important cation sorbents, contributing strongly to proton and trace metal cation buffering in soils and aquatic ecosystems. The samples were analyzed for soil physical and chemical properties and mineralogy of clay fraction (XRD-XRF). Soil samples were polluted with heavy metals for two months then treated with 0, 2 and 5% of leonardite. The desorption kinetics of heavy metals were carried out for Cd, Zn and Pb at the concentration of 1000, 4000 and 10000 mg kg-1, respectively, in 2, 24, 48, 168, 360, 720, 1080, 1440 and 2160 hrs during 90 days period. Based on the results of X-ray diffraction analysis, smectits were dominant clay minerals in studied soils. Parabolic diffusion, first order and power function kinetic mode...
Soil contamination with heavy metals to serious problems for the environment and the environmenta... more Soil contamination with heavy metals to serious problems for the environment and the environmental stresses is important for plants. This study was designed to investigate the effect of leonardite in changing the chemical forms of heavy metals in soils derived from different parent materials including Syenite, Schist, Gabbro and Calcite. Analysis of physic-chemical properties and clay mineralogy of soils were studied. Chemical forms of Zinc (Zn) in presence of leonardite (0, 2, and 5%) were evaluated using sequential extraction method. The results showed that the quality and quantity of clay minerals were different and smectite mineral were dominant. Leonardite application decreased pH in Syenite soil. Also, the chemical forms of Zn in different soils significantly controlled by leonardite levels. The variation of Zn chemical species varied in different soils. Amount of Zinc related to the oxides Fe-Mn and organic carbon forms, increased in all soils by leonardite application and th...
پالایش سبز یکی از روشهای مناسب برای کنترل اثرات سمی عناصر سنگین در خاک می باشد. این طرح به منظور ... more پالایش سبز یکی از روشهای مناسب برای کنترل اثرات سمی عناصر سنگین در خاک می باشد. این طرح به منظور بررسی توانایی لئوناردیت (Leonardite) در جذب و قابل استفاده بودن روی در چهار نوع خاک با مواد مادری متفاوت انجام شد. چهار نوع خاک با منشا مواد مادری متفاوت از عمق 30-0 سانتی متری برداشت شد. آزمایش‌های گلخانه‌ای بصورت فاکتوریل در قالب طرح پایه کاملا تصادفی با دو فاکتور لئوناردیت و نوع خاک در سه تکرار انجام گردید. بعد از کشت و گذشت دو ماه غلظت روی در خاک، ریشه و بوته ذرت به طور مجزا آنالیز شد. نتایج نشان داد خاک‌ها بدون محدودیت شوری و اسیدیته خیلی کم تا قلیایی خفیف متغیر بودند. تجزیه واریانس نشان داد تاثیر نوع خاک و سطوح مختلف لئوناردیت و اثرات متقابل آنها در خاک، ریشه و ساقه معنی‌دار شد (P<0.001). میانگین غلظت روی قابل استفاده در خاکهای مورد مطالعه بر اساس عصاره گیری DTPA کاملا متفاوت بوده و بیشترین مقدار در خاک سینیت مشاهده شد. همچنین با افزایش سطوح لئوناردیت مقدار روی قابل استفاده در خاک سینیت افزایش ولی در خاک شیست و گابرو معنی دار نشد. تجمع روی در ریشه با افزایش لئوناردیت در همه خاک...
Adsorption and desorption of heavy metals is one of conseqential processes in soil chemistry. Cla... more Adsorption and desorption of heavy metals is one of conseqential processes in soil chemistry. Clay minerals, iron and manganese oxides and soil organic compounds have considerable effect on these processes. The aim of this study was comparison of leonardite effect on adsorption/desorption reactions of heavy metals in three soils different in parent materials. Surface soil samples were collected from different soil parent materials including Calcite, Siyenite and Gabro derived in Akpınar-Kırşehir province located in the central of Anatolia Turkey. Soil physical and chemical properties were determined through standard methods, clay mineralogy characteristic identified by X-ray diffraction method (XRD). Adsorption/desorption reactions of Lead (Pb) and Zinc (Zn) were done in three leonardite levels including 0%, 2% and 5%. Adsorption data was prepared using Pb (NO3)2 and Zn (NO3)2 with concentration between 100-1200 mgl-1 and 25-400 mgl-1, respectively. Also desorption studies were carr...
This study was carried out to determine effects of soil properties on Zn adsorption. For this pur... more This study was carried out to determine effects of soil properties on Zn adsorption. For this purpose, soils with different clay and lime contents were selected. The types of clay in soils were also analysed and found that Mica/Illite, Kaolinite, Smectite and Chlorite type clays were generally dominant. For Zn adsorption, different concentrations of Zn solution (0, 50, 100, 150, 200, 250,300, 350 and 400 mg Zn l-1) were added to the soil samples and the samples were kept to reach the equilibrium state within 24 hours. It was found that the Zn adsorption properties of soils conformed to the Langmuir and Freundlich isotherms and according to the variance analysis performed on the data, R 2 values were generally found to be P<0.001. According to correlation analyses, statistically significant relationships were found at (P<0.001) level between the k l value calculated in the Langmuir model, and CEC and the percent clay content. In Freundlich isotherms, however, statistically sign...
The aim of this study was the effected of leonardite on kinetics desorption of heavy metals in so... more The aim of this study was the effected of leonardite on kinetics desorption of heavy metals in soils formed from different parent materials including Syenite, Siyenit-Calcite, Schist and Gabbros rocks. Leonardite is a rich source of humic and fulvic acid and act as important cation sorbents, contributing strongly to proton and trace metal cation buffering in soils and aquatic ecosystems. The samples were analyzed for soil physical and chemical properties and mineralogy of clay fraction (XRD-XRF). Soil samples were polluted with heavy metals for two months then treated with 0, 2 and 5% of leonardite. The desorption kinetics of heavy metals were carried out for Cd, Zn and Pb at the concentration of 1000, 4000 and 10000 mg kg-1, respectively, in 2, 24, 48, 168, 360, 720, 1080, 1440 and 2160 hrs during 90 days period. Based on the results of X-ray diffraction analysis, smectits were dominant clay minerals in studied soils. Parabolic diffusion, first order and power function kinetic mode...
Soil contamination with heavy metals to serious problems for the environment and the environmenta... more Soil contamination with heavy metals to serious problems for the environment and the environmental stresses is important for plants. This study was designed to investigate the effect of leonardite in changing the chemical forms of heavy metals in soils derived from different parent materials including Syenite, Schist, Gabbro and Calcite. Analysis of physic-chemical properties and clay mineralogy of soils were studied. Chemical forms of Zinc (Zn) in presence of leonardite (0, 2, and 5%) were evaluated using sequential extraction method. The results showed that the quality and quantity of clay minerals were different and smectite mineral were dominant. Leonardite application decreased pH in Syenite soil. Also, the chemical forms of Zn in different soils significantly controlled by leonardite levels. The variation of Zn chemical species varied in different soils. Amount of Zinc related to the oxides Fe-Mn and organic carbon forms, increased in all soils by leonardite application and th...
پالایش سبز یکی از روشهای مناسب برای کنترل اثرات سمی عناصر سنگین در خاک می باشد. این طرح به منظور ... more پالایش سبز یکی از روشهای مناسب برای کنترل اثرات سمی عناصر سنگین در خاک می باشد. این طرح به منظور بررسی توانایی لئوناردیت (Leonardite) در جذب و قابل استفاده بودن روی در چهار نوع خاک با مواد مادری متفاوت انجام شد. چهار نوع خاک با منشا مواد مادری متفاوت از عمق 30-0 سانتی متری برداشت شد. آزمایش‌های گلخانه‌ای بصورت فاکتوریل در قالب طرح پایه کاملا تصادفی با دو فاکتور لئوناردیت و نوع خاک در سه تکرار انجام گردید. بعد از کشت و گذشت دو ماه غلظت روی در خاک، ریشه و بوته ذرت به طور مجزا آنالیز شد. نتایج نشان داد خاک‌ها بدون محدودیت شوری و اسیدیته خیلی کم تا قلیایی خفیف متغیر بودند. تجزیه واریانس نشان داد تاثیر نوع خاک و سطوح مختلف لئوناردیت و اثرات متقابل آنها در خاک، ریشه و ساقه معنی‌دار شد (P<0.001). میانگین غلظت روی قابل استفاده در خاکهای مورد مطالعه بر اساس عصاره گیری DTPA کاملا متفاوت بوده و بیشترین مقدار در خاک سینیت مشاهده شد. همچنین با افزایش سطوح لئوناردیت مقدار روی قابل استفاده در خاک سینیت افزایش ولی در خاک شیست و گابرو معنی دار نشد. تجمع روی در ریشه با افزایش لئوناردیت در همه خاک...
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