بكتريا التربة كمؤشر حيوي لتلوث ترب جنوب العراق بالمعادن الثقيلة
محتوى المقالة الرئيسي
الملخص
خلصت نتائج الدراسة الحالية الى ان الترب المدروسة من محطات في جنوب العراق ملوثة بالمعادن الثقيلة التالية ( الكادميوم و النحاس و الحديد و الزنك و الرصاص), حيث كان متوسط تركيز تلك المعادن اعلى من الحد المسموح به عالميا" وكما مبين في النتائج ادناه (3.394, 3.994, 39.993, 8844.979,150.372, and 103.347 µg/g) وعلى التوالي. يعتبر دراسة التركيز الكلي للمعادن الثقيلة مؤشر جيد لتحديد درجة التلوث الا انه لايمكن ان يعطي صورة واضحة حول تأثراته على الكائنات الحية . سجلت الدراسة الحالية تراكيز منخفضة من التركيز المتوافر للمعادن الثقيلة المدروسة مقارنة" بتركيزها الكلي ( ( 0.015, 0.787, 0.021, 0.515, and4.304 µg/ . عزلت أنواع مختلفة من البركتريا من ذات الترب المدروسة (Serratia marcescens, Sphingomonas paucimobilis, Bacillus subtilis, Pseudomonas aeruginosa, and Staphylococcus lentus) وبذلك يمكن ان يعتبر عزل هذه البكتريا من تلك الترب الملوثة كأحد المؤشرات الحيوية للتلوث بالمعادن الثقيلة والتي اثبت من خلال دراسة MIC ( اقل تركيز قاتل للبكتريا)والذي بينت نتائجة قابلية عالية للبكترايا لتحمل تراكيز عالية من تلك المعادن الثقيلة
Received 18/2/2021
Accepted 25/5/2021
Published Online First 20/1/2022
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كيفية الاقتباس
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