بررسی غلظت فلزات سنگین در بافت عضلۀ میگوی پاسفید (Litopenaeus vannamei)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد, گروه محیط زیست, دانشکدۀ منابع طبیعی، دانشگاه تهران، ایران

2 استادیار گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران، ایران

3 استادیار گروه شیلات، دانشکدۀ منابع طبیعی، دانشگاه تهران، ایران

چکیده

آبزیان از مهم‌ترین منابع غذایی انسان‌اند، اما هم‌زمان فلزات سنگین واردشده به اکوسیستم‌های آبی را در بافت‌ها و اندام‌های خود جمع و در جریان چرخه‌های زیستی به سطوح غذایی بالاتر و درنهایت انسان منتقل می‌کنند. میگوها دسته‌ای از آبزیان خوراکی‌اند که با توجه به کفزی‌بودنشان میزان بسیاری عناصر سنگین را از آب دریافت می‌کنند. از این رو، در پژوهش حاضر غلظت فلزات سنگین کادمیم، نیکل، مس و روی در گونة میگوی پاسفید (Litopenaeusvannamei) بررسی می‌شود. نمونه‌ها به صورت تصادفی از بازار تهران خریداری شد. این نمونه‌ها صید استخرهای پرورشی در سواحل استان‌های خوزستان و بوشهر بود. در ابتدا طول، وزن و جنسیت آن‌ها تعیین شد. سپس بافت عضله، به روش هضم تر، هضم شد و داده‌های مربوط به غلظت فلزات با استفاده از دستگاه جذب اتمی به دست آمد. نتایج آنالیز آماری داده‌ها نشان داد که بین غلظت فلزات با متغیرهای ریختی، هم‌چنین با یکدیگر هم‌بستگی وجود ندارد. هم‌چنین دو جنسیت از نظر غلظت فلزات اختلاف معنا‌داری نداشتند (مگر دربارة فلز کادمیم که نرها بیشتر از ماده‌ها جذب کرده بودند). بین غلظت فلزات با یکدیگر اختلاف معنا‌داری مشاهده شد (دربارة فلز روی این اختلاف معنا‌دار نبود). الگوی تجمع فلزات نیز به صورت زیر بود: روی> مس> نیکل> کادمیم. مقایسة غلظت فلزات با مقادیر استاندارد نشان داد که غلظت فلزات نیکل، مس و روی کمتر از استانداردهای FDA، WHO، NHMRC و MAFF است، اما دربارة فلز کادمیم غلظت بیش از استانداردها بود.

کلیدواژه‌ها


عنوان مقاله [English]

Heavy metal concentrations in muscle tissues of white leg shrimp (Litopenaeus vannamei)

نویسندگان [English]

  • zohreh Ahmadi Kordestani 1
  • Amirhossein Hamidian 2
  • Seyyed Vali Hosseini 3
  • Sohrab Ashrafi 2
1 MSc. Department of Natural Environment, Faculty of Natural Resources, University of Tehran, Karaj, Iran
2 Assistant Professor, Department of Natural Environment, Faculty of Natural Resources, University of Tehran, Karaj, Iran
3 Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran
چکیده [English]

Aquatic organisms are one of most important human food sources but they can accumulate heavy metals Entered aquatic ecosystems in their tissues and organs same time and can be transferred through the food chain to higher food levels and in the most top into the human body. Shrimps are of the main groups of sea foods; and because they are benthic species, they can absorb high concentrations of heavy metals from the media. Therefore, in this research the concentrations of heavy metals cadmium, nickel, copper and zinc were determined in white leg shrimp (Litopenaeus vannamei). Samples were randomly purchased from Tehran market. The samples were caught from coastal ponds of Khuzestan and Bushehr provinces. First, Length, weight and sex of the samples were determined. Then muscle tissues were wet digested and the metal concentrations were determined using atomic absorption spectroscopy (Perkin Elmer, USA). Statistical analysis of data indicated that, there were no correlations between concentrations of metals with morphological variables. No significant differences were observed between the concentrations of metals in two sexes; however, males had higher concentrations of cadmium than females). No significant differences were observed between metals concentrations. The general pattern of metals concentrations were Zn> Cu> Ni> Cd. Comparison of the metal concentrations with standard values showed that the concentrations of nickel, copper and zinc were lower than FDA, WHO, NHMRC and MAFF standards but cadmium concentrations were higher than these standards.

کلیدواژه‌ها [English]

  • aquatic organism
  • Heavy metals
  • Standard
  • water pollution
  • white leg shrimp (Litopenaeus vannamei)
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