استكشاف توزيع المواد البلاستيكية الدقيقة والمعادن الثقيلة في التربة الزراعية وتقييم مؤشرات المخاطر في مدينة أربيل
الملخص
تُعد المواد البلاستيكية الدقيقة (MPs) والمعادن الثقيلة (HMs) ملوثات جديدة تشكل تهديدات محتملة على البيئة والصحة البشرية. يهدف هذا البحث إلى تقييم تركيز المواد البلاستيكية الدقيقة والمعادن الثقيلة وانتشارها والمخاطر الصحية المحتملة لها في التربة الزراعية بمدينة أربيل، العراق. سيتم تقييم جودة المواد البلاستيكية الدقيقة من خلال تحليل عينات التربة المأخوذة من ستة مواقع زراعية باستخدام مطيافية الأشعة تحت الحمراء بتقنية تحويل فورييه (FT-IR). احتوت مواقع الدراسة والنباتات على أشكال مختلفة من المواد البلاستيكية الدقيقة، بما في ذلك PET وPA وPE وPS وPP. قد تحتوي عينات S3–S5 على آثار من هياكل عطرية، مما يشير إلى تلوث بـ PS أو نواتج تحلل PET. لوحظت أعلى كمية من جزيئات البلاستيك لكل جرام من التربة في الموقع S4 من PET، مع نطاق يتراوح من 0 إلى 2.88 ± 0.55. تم تقييم المعادن الثقيلة مثل Ba و Co و Cr و Cu و Fe و Mn و Ni و Pb و Zn في مواقع التربة ونوعين نباتيين مختلفين باستخدام جهاز ICP. كانت مستويات الكروم والمنغنيز والنيكل والحديد والزنك في العينات المفحوصة أعلى من المستويات المسموح بها من قبل منظمة الأغذية والزراعة (FAO). بناءً على تلوث البلاستيك الدقيق والمعادن الثقيلة، تم تصنيف الموقعين S2 و S6 ضمن فئة الخطورة المتوسطة، بينما أظهر الموقع S4 مستوى خطر بيئي مرتفع. وفقًا للبيانات التي تم الحصول عليها من MPs و HMs، تم الإبلاغ عن أقوى الارتباطات الإيجابية بين الألومنيوم و PET (بولي إيثيلين تيريفثالات) MPs (r = 0.82)، بينما كان الارتباط بين الرصاص و PS (r = 0.78). بالإضافة إلى ذلك، ستقوم الدراسة بتقييم ما إذا كان من الممكن أن تدخل المواد البلاستيكية الدقيقة والمعادن الثقيلة إلى سلسلة الغذاء وتشكل خطرًا على صحة الإنسان.
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