Kireçli Anamateryal Üzerinde Oluşan Topraklarda Çinko Adsorpsiyonu ve Toprak Özellikleriyle İlişkileri

Yıl 2019, Cilt: 14 Sayı: 2, 156 - 165, 23.12.2019

Veli Uygur , Bilal Kaya

Öz

Çinkonun (Zn) toprak bileşenleri tarafından kuvvetli şekilde
adsorpsiyonu, çözünmeyen katı fazların çökelmesi ve şelatlayıcı ajanların
yetersizliği bitkilerin alabileceği formlarda bulunan Zn miktarının düşük
olmasına neden olmaktadır. Ancak her bir toprak kendine özgü karakteristikler
göstererek farklı mekanizmalarla topraklarda Zn yarayışlılığının düşük olmasına
neden olmaktadır. Bu çalışmada farklı toprakların Zn adsorpsiyon
karakteristiklerini, yarayışlı Zn içeriği düşük olan toprak örneklerinin yapılacak
gübrelemeye olan tepkilerini ve potansiyel kirlilik durumlarında Zn’nin
hareketliliğini Langmuir ve Freundlich adsorpsiyon izotermleri ile belirlemek
amaçlanmıştır. Atabey Ovası’ndan yarayışlı Zn içeriği düşük olan 24 farklı
toprak örneği alınarak bu topraklarda Zn adsorpsiyonu, “batch adsorpsiyon”
tekniği ile belirlenmiştir. 2 g toprak örneği ile 0, 10, 25, 50, 100,
150, 200 ve 300 mg Zn L-1
içeren 25 mL 0.01 M CaCl2 çözeltisi 20±2°C sabit sıcaklıkta 24 saat
dengeye getirilmiştir. Elde edilen adsorpsiyon verilerinin izoterm modellerine
uygunluğu regresyon analizleri ile test edilmiştir. Ayrıca toprakların
tanımlayıcı özellikleri ile sorpsiyon parametreleri arasındaki ilişkiler
Pearson korelasyonu kullanılarak incelenmiştir. Toprakların hesaplanan Langmuir
adsorpsiyon maksimumlarının 1527-3448 mg kg-1 arasında değişim
gösterdiği belirlenmiştir. Korelasyon analizleri toprakların maksimum
adsorpsiyonunun organik madde, kireç, kil içeriğiyle ilgili özellikler, pH ve
oksit minerallerinin farklı fraksiyonları ile ilişkili olduğunu ortaya
koymuştur. Sonuç olarak topraklarda Zn hareketliliği, yarayışlılığı ve ilave
edilen Zn nin katı-sıvı faz arasındaki dağılımı toprak özelliklerinin ortak
etkisi sonucu ortaya çıktığı değerlendirilmiştir.

Anahtar Kelimeler

Çinko, adsorpsiyon, toprak özellikleri, Atabey Ovası

Destekleyen Kurum

Süleyman Demirel Üniversitesi, BAP Birimi

Proje Numarası

5066-YL1-17

Teşekkür

Bu çalışma Süleyman Demirel Üniversitesi Bilimsel Araştırma Koordinasyon Birimi tarafından 5066-YL1-17 nolu yüksek lisans projesi kapsamında desteklenmiştir.

Zinc Adsorption and Relations with Soil Properties in Soils Forming on Calcareous Parent Material

Öz

The plant-available zinc (Zn) in soil solution
remains insufficient for optimal plant growth due to the strong adsorption of
zinc by the soil components, the precipitation of Zn as insoluble solid phases
and the presence of inadequate chelating agents. However, each soil causes the zinc
availability to be low in the soil solution by means of different mechanisms
due to its own specific physicochemical characteristics. The aims of this study
are: i) to determine the zinc adsorption characteristics of the experimental
soils, ii) to determine the potential response of Zn-deficient soils to Zn
fertilization and iii) to determine the mobility of zinc in the soils under
extreme Zn loading by Langmuir and Freundlich adsorption isotherms. Zinc
adsorption was determined by batch adsorption technique in 24 different
Zn-deficient soil samples from Atabey Plain, Isparta, Turkey. 25 mL of 0.01 M
CaCl2 solution containing 0, 10, 25, 50, 100, 150, 200, and 300 mg
Zn L-1 were equilibrated with 2 g of soils at a constant temperature
of 20°C for 24 h. The appropriateness of the obtained adsorption data to the
isotherm Langmuir and Freundlich models were tested by regression analysis. The
relationships between the descriptive properties of the soils and the sorption
parameters were revealed by Pearson correlation analysis. It was determined
that the Langmuir adsorption maxima of the soils ranged between 1527-3448 mg kg-1.
Correlation analyses revealed that the maximum adsorption of soils is
associated with organic matter, lime, clay content, pH, and different
geochemical fractions of oxide minerals. As a result, Zn mobility, availability
and solid-solution partition of added Zn in the soil can be a result of the cooperative
effects of soil properties.

Anahtar Kelimeler

Zinc, adsorption, soil properties, Atabey plain, Langmuir and Freundlich isotherms

Proje Numarası

5066-YL1-17

Kaynakça

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