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   the effect of incubation time and silk worm cocoon on mobility of zinc and copper in contaminated clay soil  
   
نویسنده lorestani bahareh ,merrikhpour hajar ,daneshvari faezeh ,kohahchi nasrin
منبع journal of advances in environmental health research - 2013 - دوره : 1 - شماره : 2 - صفحه:73 -80
چکیده    Of the problematic agents in the ecosystem, heavy metals have special importance because they are unabsorbable and have physiologic effects on living beings at low concentrations. this study has investigated the effect of silk worm cocoon on reducing mobility of zinc (zn) and copper (cu) for the first time. to this end, 5% cocoon adsorbent was added to the studied soil, which had been contaminated with cu and zn in separate containers at concentration of 600 mg/l. the experiment was performed in three repeats and two treatments (with and without adsorbent). samples were incubated at 28°c at constant humidity for 3 hours, 1, 3, 7, 14, 21, and 28 days. then both treatments were extracted using sequential extraction method and the concentration of zn and cu was processed using atomic absorption spectrophotometry. the results showed that there were changes in mobility of the zn and cu added to soil; adding silk worm cocoon to soil increased organic phase of zn and cu as compared to the soil without adsorbent. data were analyzed by spss software. all comparisons of the means were performed at statistical level of 5% using student’s independent t-test. student’s independent t-test showed that the highest significant difference (p < 0.05) was observed in the organic fraction of the cu-zn contaminated soil with cocoon, as compared with the cu-zn contaminated soil without cocoon.
کلیدواژه soil ,zinc - copper ,decreased mobility ,silk worm cocoon ,incubation
آدرس islamic azad university, hamedan branch, school of basic science, department of environment, ایران, islamic azad university, hamedan branch, school of basic science, department of environment, ایران, islamic azad university, hamedan branch, school of basic science, department of environment, ایران, islamic azad university, hamedan branch, school of basic science, department of environment, ایران
 
     
   
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