معالجة تربة الحقول النفطية الملوثة بالمواد المشعة ذات المنشأ الطبيعي بطريقة الاستخلاص الكيميائي
DOI:
https://doi.org/10.21123/bsj.2024.9968الكلمات المفتاحية:
الترشيح الكيميائي, EDTA ، كاشف HPGe، NORM، 226Ra ,228Raالملخص
يعد تلوث التربة بالمواد المشعة التي تحدث بشكل طبيعي (NORM) مشكلة شائعة في حقول النفط مما يؤدي إلى برامج مكلفة للمعالجة والتخلص النهائي (الطمر), حيث ان أهم النويدات المشعة في هي 226Ra و228Ra . تركز هذه الدراسة على معالجة التربة الملوثة ب NORM لتقليل النشاط الاشعاعي ضمن الحدود المسموح بها والذي ينعكس على تقليل مخاطر الإشعاع على العمال والجمهور والبيئة. تناولت الدراسة المعالجة الكيميائية لعينتين من التربة عن طريق اختبار الترشيح باستخدام التنقنيات المنفردة والمتتابعة بمذيبات كيميائية مخففة عضوية وغير عضوية (مثل HNO3 وHCl وC₆H₈O₇ وC2H4O2 وEDTA وH2SO4 )، حيث تم قياس تراكيز النشاط الأولي لـ 226Ra و228Ra باستخدام محلل مطيافية كاما بكاشف الجرمانيوم عالي النقاوة (HPGe) ، حيث كانت 59674.7 ± 2731.2 و 7058.2 ± 451.07Bq.kg-1 على التوالي للعينة الأولى، في حين كانت 7666.6 ± 615.4 و 826.36 ± 143.4 Bq.kg-1 للعينة الثانية. الاستخلاص المتسلسل انجز في ثلاث خطوات متتالية (تعديل الحامضية وتبادل الأيونات والترشيح بالمذيب النهائي). أن الترشيح المنفرد أعطى نتائج ضعيفة في استخراج نظائر الراديوم من التربة بواسطة المحاليل المخففة, بينما الترشيح المتسلسل كان أفضل ، وجد أن المذيبات الأكثر فعالية هي حمض الأسيتيك (M (C2H4O22 مع نسبة سائل إلى صلب L:S قدرها 5 mL/g عند درجة حرارة 40 ˚C للعينة الأولى، حيث 78.4% و80.6% من 226Ra و228Ra تم ازالتها وتحويلها إلى الطور المائي، بينما تمت إزالة 87.9% و91% باستخدام 2M HNO3 للعينة الثانية وبنفس الظروف.
Received 16/10/2023
Revised 23/02/2024
Accepted 25/02/2024
Published Online First 20/08/2024
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الحقوق الفكرية (c) 2024 Zaidoon H. Ibrahim, Asia H. Al-Mashhadani
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