Osman SÖNMEZ, Salih AYDEMİR, Songül İNAL

Çinkonun canlılar için önemi ve çinko biyo-yarayışlılığının belirlenme yöntemleri

Çinko, insanlar, hayvanlar ve bitkiler için gerekli bir elementtir. Genellikle topraklarda düşük konsantrasyonda bulunur. Bununla birlikte toprakta insan etkisiyle oluşan çinko bitkilere zehir etkisi yapacak seviyeye çıkabilir. Metal toksisitesi, metallerin toprak içindeki toplam miktarından ziyade biyo-yarayışlılığına bağlıdır. Metal biyo-yarayışlılığının belirlenmesi zordur. Çünkü biyo-yarayışlılık birçok toprak özellikleri tarafından etkilenir. Çinko toksisitesini belirlemede kullanılan en genel parametreler verim azalması, bitki çinko konsantrasyonları, demir eksikliğinden dolayı kloroz oluşması, bitki dokusundaki Ca:Zn oranları, çeşitli ekstraksiyonlar ve diffuse gradient in thin films (DGT)dir.

Importance of zinc in soils for living organisms and determination of zinc bioavailability

Zinc is a required element for plants, animals as well as humans. It usually in low concentrations in soil. However, anthropogenic sources can increase soil zinc to a level toxic to plants. Metal toxicity is related to bioavailability rather than the total concentration of metal in soil. The assessment of metal bioavaibility is difficult because bioavaibility is influenced by many soil properties. The most common parameters used to evaluate zinc phytotoxicity are yield decreases, plant zinc concentrations, iron-induced chlorosis, Ca:Zn ratios in plant tissue, batch extractions and diffuse gradient in thin films (DGT).

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