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Choising the alternative conditions for the continuity of the work of the nitrate-selective electrode

اختيار الشروط البديلة لاستمرارية عمل مسرى النترات الانتقائي

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 Publication date 2017
and research's language is العربية
 Created by Shamra Editor




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Due to the absence of operational requirements and its unidentified solutions ,this study presented definition alternative analytical and technical conditions for the continuation of nitrate-selective electrode working. Many electrolytes were tested (ammonium sulfate, ammonium acetate and ammonium chloride). The technical and analytical conditions shows that the best response which give the Nernst slope of the electrode had been obtained by adding 0.5ml of ammonium sulfate (3mol / l), and the response time was 20sec, by the time that values stabilized for 15sec. The study of pH effect on the electrode response also showed that electrode works within the range (2-8) of pH and that the best response was at pH = 5.5 by using acetic acid-sodium acetate buffer. The effect of temperature on the potential electrode was studied ,it showed that the Nernest electrode response realized within the range (18-37) C0of temperature.While Studying the effect of some interfering ions such as (OH-, HCO3 -, CO3 2-,Cl-,NO2 -) on the work of the electrode showed low values of the coefficient of selectivity, which did not exceed 3×10-2 that the electrode was not affected by the presence of these ions. The chosen conditions were experimented on standard solutions, which showed that the electrode is working within the range (10-4-10-1) mol / l of concentrations. When the concentrations was about 10-5mol/l or less than that, it was necessary to soak the electrode in solution which has low concentration for at least one hour, and diluted the taken volumes ten times . These technical and analytical conditions was applied on standard solutions and environmental samples(water), which showed the accuracy ,correctly and authenticity of the measurements.


Artificial intelligence review:
Research summary
تناولت الدراسة إيجاد شروط بديلة تحليلية وتقنية لاستمرار عمل مسرى النترات الانتقائي، نظراً لغياب الشروط التشغيلية والمحاليل المرفقة بها مجهولة الهوية. جرى العمل على اختبار أكثر من الكتروليت مثل كبريتات الأمونيوم، خلات الأمونيوم وكلوريد الأمونيوم. وتبين من خلال الشروط التقنية والتحليلية أن إضافة كبريتات الأمونيوم بتركيز 3mol/1 أعطت أفضل استجابة وميل نرنستي للمسرى كما أعطت زمن تجاوب 20 ثانية وبقيت القيم ثابتة لمدة 15 ثانية. كما بينت دراسة مجال الـ pH أن المسرى يعمل ضمن مجال (8-2)pH وأن أفضل استجابة كانت عند 5.5 بوجود المحلول المنظم حمض الخل-خلات الصوديوم. دُرس تأثير درجة الحرارة على كمون المسرى ووجد أن الاستجابة نرنستية عند مجال درجة حرارة (37-18) درجة مئوية. أما عند دراسة إعاقة بعض الأيونات مثل (OH، HCO3، CO3، CI، NO2) على عمل المسرى فقد بينت القيم المنخفضة لمعامل الانتقائية الذي لم يتعد 3×10-2 عدم تأثر المسرى بوجود هذه الأيونات. جُربت الشروط المختارة على محاليل عيارية، فلُحظ أن المسرى يعمل ضمن مجال تراكيز (10-4-10)mol/l، أما عند التراكيز من مرتبة (10-5mol/l) فما دون كان لابد من نقع المسرى بمحلول ذي تركيز منخفض لمدة ساعة على الأقل وتمديد الحجوم المأخوذة عشر مرات. طبقت هذه الشروط التقنية والتحليلية على محاليل عيارية وواقعية (عينات مائية)، فأعطت نتائج قياس دقيقة وصحيحة وذات مصداقية.
Critical review
دراسة نقدية: تقدم هذه الدراسة مساهمة هامة في مجال التحليل الكيميائي والبيئي من خلال تحسين شروط عمل مسرى النترات الانتقائي. ومع ذلك، يمكن ملاحظة بعض النقاط التي قد تحتاج إلى مزيد من التوضيح أو التحسين. أولاً، لم يتم التطرق بشكل كافٍ إلى تأثير التداخلات المحتملة من الأيونات الأخرى الموجودة في العينات البيئية الواقعية، والتي قد تؤثر على دقة القياسات. ثانياً، قد يكون من المفيد تقديم مزيد من التفاصيل حول كيفية اختيار التراكيز المثلى للإلكتروليتات المختلفة، بالإضافة إلى تحليل أكثر شمولية للنتائج الإحصائية لضمان موثوقية النتائج. وأخيراً، يمكن أن تكون الدراسة أكثر شمولاً إذا تم تضمين تطبيقات عملية إضافية في مجالات أخرى مثل الزراعة والصناعة، مما يعزز من قيمة البحث ويزيد من نطاق استخدامه.
Questions related to the research
  1. ما هي أفضل الشروط التشغيلية لمسرى النترات الانتقائي التي توصلت إليها الدراسة؟

    أفضل الشروط التشغيلية التي توصلت إليها الدراسة هي استخدام كبريتات الأمونيوم بتركيز 3mol/1، مجال pH بين 2-8 مع أفضل استجابة عند pH=5.5 باستخدام محلول منظم حمض الخل-خلات الصوديوم، ومجال درجة حرارة بين 18-37 درجة مئوية.

  2. ما هو تأثير درجة الحرارة على استجابة مسرى النترات الانتقائي؟

    وجدت الدراسة أن استجابة مسرى النترات الانتقائي نرنستية ضمن مجال درجة حرارة بين 18-37 درجة مئوية، مما يعني أن المسرى يعمل بكفاءة ضمن هذا المجال الحراري.

  3. كيف تؤثر الأيونات المعيقة على عمل مسرى النترات الانتقائي؟

    بينت الدراسة أن الأيونات المعيقة مثل OH، HCO3، CO3، CI، NO2 لها تأثير منخفض على عمل مسرى النترات الانتقائي، حيث لم يتعد معامل الانتقائية 3×10-2، مما يدل على أن المسرى غير متأثر بشكل كبير بوجود هذه الأيونات.

  4. ما هي الإجراءات المتبعة عند قياس تراكيز منخفضة جداً من النترات؟

    عند قياس تراكيز منخفضة جداً من النترات (من مرتبة 10-5mol/l فما دون)، يجب نقع المسرى بمحلول ذي تركيز منخفض لمدة ساعة على الأقل وتمديد الحجوم المأخوذة عشر مرات لضمان دقة القياس.

Keywords

References used
COMELIA.M; PETRU.N;MIHAELA.C; LAVINIA.L;IOAN.U; GIANNIN.M. Studies Regarding the Ground Water Pollution in a Rural Area. Chem.Bull, Romania, 2006, Vol.51(65),1- 2, 75-78
SIMON.V; CAMPEANU.GH; VASILE.G; ARTIMON.M; CATANA.L; NEGOTTA.M. Nitrate and nitrite accumulation in tomatoes and derived products.Bucharest University, Romania, 2008, Vol. 3, No.4, pp. 3785-3790
IARC Working Group .Ingested Nitrate and Nitrite, and Cyanobacterial PeptideToxins. World health organization international agency for research on, France, 2010, Vol94
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