بررسی تجمع زیستی فلزات در رسوبات و عضله ماهیان رودخانه دز در سال ۱۳۹۳

الموضوعات :

ثمر مرتضوی ¹ , پریسا نوروزی ²

1 - استادیار، دانشکده منابع طبیعی و محیط زیست، دانشگاه ملایر* (مسوول مکاتبات)
2 - دانشجوی دکتری دانشکده منابع طبیعی و محیط زیست، دانشگاه ملایر، ملایر، ایران

تاريخ الإرسال : 27 الأربعاء , صفر, 1437 تاريخ التأكيد : 20 الأربعاء , رجب, 1437 تاريخ الإصدار : 22 الجمعة , ذو الحجة, 1440

الکلمات المفتاحية: فلزات, عامل تغلیظ زیستی, عامل وضعیت, رودخانه دز,

ملخص المقالة :

زمینه و هدف: ضرورت سنجش عناصر در آب زیان به دو مبحث مدیریت زیست بوم ها و سلامت غذایی انسان ها باز می گردد. در پژوهش حاضر غلظت عناصر Cu, Pb, Zn و Cd در رسوبات و بافت عضله چهار گونه ماهی بومی رودخانه دز مورد بررسی قرار گرفت تا آلودگی فلزات و ارتباط آن با عامل وضعیت (CF) و عامل تغلیظ زیستی BCF)) مطالعه گردد. روش بررسی: پس از زیست سنجی نمونه های ماهی، هضم نمونه ها با ترکیب یک به چهار اسیدنیتریک به اسیدپرکلریک انجام و غلظت عناصر با دستگاه جذب اتمی اندازه گیری گردید. یافته ها: میانگین غلظت فلزات در رسوبات و بافت عضله به ترتیب روند کاهشی کادمیوم<سرب<مس<روی و سرب<کادمیوم<مس<روی را نشان می دهد. تحلیل آماری نتایج بیان گر بیش ترین هم بستگی بین تجمع فلزات و CF در گونه تویینی و بیش ترین بارگیری آلودگی آن با محاسبه شاخص MPI می باشد. BCF حاصل نیز نشان دهنده روند کاهشی جذب فلزات کادمیوم، روی، مس و سرب از محیط است. از سویی مقادیر CF، از حدود مناسب معرفی شده برای ماهیان آب های آزاد کم تر به دست آمد. هم چنین مقایسه غلظت فلز روی در رسوبات از استاندارد جهانی CaISQG و سطح قابل تحمل IAEA-407 بالاتر و در بافت عضله، غلظت روی و کادمیوم به ترتیب از استانداردهای UK(MAFF) و NHMRC بالاتر می باشد که نشان دهنده سطوح خطرناک آن ها برای سلامتی انسان است. بحث و نتیجه گیری: به نظر می رسد شرایط منطقه مورد مطالعه از رودخانه دز در مقایسه با آب های آزاد برای ماهیان نامساعد بوده و بالا بودن غلظت کادمیوم در نمونه های مورد مطالعه را می توان ناشی از پساب زمین های کشاورزی مشرف به رودخانه دانست.

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