S76 : The Effect of Electrolyte Composition and Zeolite on Cadmium Adsorbtion in Soil
Thesis > Central Library of Shahrood University > Agricultural Engineering > MSc > 2012
Authors:
Fahime Khizab [Author], Hadi Ghorbani[Supervisor], Hamid Abbasdokht[Advisor], Faramarz Faeznia [Advisor]
Abstarct: Environmental pollution by heavy mextals has been coverted a devloping global problems. Among heavy mextals cadmium is more significance because it is more toxic than other mextals.This problem is exacerbated when it combined with soil and water salnity. Since the influence of salinity on bioavalability of heavy mextals in soil is significant, it is considered as an important factor in food security threat. In order to investigate the effect of electrolyte composition and zeolite on cadmium plant uptake a factorial experiment baxsed on a randomized complete block design with two levels of zeolite (zero and ten percent) and three levels of salinity (2, 4 and 6 dS/m) of electrolytes NaCl, CaCl2, NaNO3 and Ca(NO3)2 was performed in three replication baxsed on greenhouse planting. Spinach seeds at 70 ◦C, digestin was perfrmed on plants samples and then cadmium concentration in shoots was measured by the ICP. the Cadmium uptake in shoots was obtained by multiplying cadmium concentration in plant dry matter yield. The highest amount of cadmium concentration was related to the plant samples which were irrigated with sodium chloride salt and then calcium chloride. Also significantly difference in the concentration of heavy mextals were not found between calcium nitrat and sodium nitrat salts at the %5 level. In the case of cadmium uptake, between two sodium chloride and calcium chloride salts were not significantly different at the %5 level. While the lowest amount of uptake was related to sodum nitrat salt. Increasing amount of the used electrolytes concentration also decreased significantly amount of the cadmium concentration and uptake in shoot. Using the zeolite as heavy mextals immobilizing substance decreased the cadmium consentration and uptake in shoots. Besides the survey of amount of cadmium uptake in shoots influenced by salinity and zeolite factors, the effect of these factors on some important physiologic charactristic including dry and wet weight of the shoot, dry and wet weight of the root, relative water content of the leaf tissue and the amount of the chlorophyll in leaf was investigated. Treatments with calcium electrolyte as the cation had less destructive effects on any of the investigated properties. Increasing the amount of the salinity reduced significantly the above properties. Using of the zeolite had significantly effect on the relative water amount of the leaf tissue, but its effect on dry and wet weight of shoot and root and chlorophyll content was not significant.
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