بررسي غلظت فلزات سنگين سرب، كادميوم، كروم، نيكل، و روي در كمپوست توليدي كارخانه كمپوست كرمان

Assessment of Heavy Metals Lead, Cadmium, Chromium, Nickel and Zinc in Compost Production Plant in Kerman

مقدمه: انتقال فلزات سنگين از كمپوست به محيط مصرف سبب افزايش عناصر در لايه هاي خاك و در نتيجه آلوده شدن آب هاي زيرزميني مي گردد. هدف از اين مطالعه تعيين ميزان فلزات سنگين سرب، كادميوم، كروم، نيكل و روي در كمپوست توليدي كارخانه كمپوست كرمان به منظور كنترل آلودگي هاي احتمالي ناشي از آن مي باشد. مواد و روش ها: پژوهش حاضر از نوع توصيفي و تحليلي است. بازه زماني ارديبهشت و خرداد سال 1392 جهت نمونه برداري و آزمايش انتخاب گرديد. تعداد 12 نمونه مركب از 60 تن كمپوست دپو شده مربوط به سال 1391در محل كارخانه برداشت شد. نمونه ها طبق روش هضم با اسيد نيتريك آماده سازي شد. ميزان غلظت فلزات سنگين سرب، كادميوم، كروم، نيكل و روي در كمپوست توليد ي كارخانه كمپوست كرمان با دستگاه جذب اتمي با دو بار تكرار تعيين مقدار شد. نتايج حاصل با استفاده از نرم افزار SPSS تجزيه و تحليل شد.

Introduction: Transference of heavy metals from compost to consumption environment leads to increase in intake of elements in soil layers and contaminating underground water. The aim of this study was to determine the metals Lead, Cadmium, Chromium, Nickel and Zinc in the compost production plant in Kerman in order to control the possible pollution made by them. Materials Methods: This study is descriptive and analytic. Sling and testing were performed in May and June 1392. The sle consisted of 12 60 tons of depot compost related to1391 was removed from factory. Sles were prepared with the method of digesting by Nitric Acid. The concentration of heavy metals lead, cadmium, chromium, nickel and zinc were determined twice by atomic absorption device. The obtained results were analyzed using SPSS software. Findings: The mean concentrations of Pb, Cd, Cr, Ni, and Zn in sles of compost produced at the plant in Kerman were 221.85plusmn 15.69, 1.36plusmn 0.11, 147.94plusmn 5.9, 129.71plusmn 9.45, 634.71plusmn 28.05 mg/kg respectively. Discussion Conclusion: According to the results of this study, the mean concentration of Pb was more than its allowable standard rate of Environmental Protection Agency of America (EPA) and Standard and Industrial Researches Institute of Iran. The mean concentration of Nickel was higher than its allowable standard rate of Standard and Industrial Researches Institute of Iran. The mean concentrations of Cadmium, Chromium and Zinc were lower than the standard rate. The difference was statistically significant (p <0.0001). Regarding to the importance of the rate of heavy metals in compost, considering standards to control the quality of the final product obtained from the composting process is necessary.