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Choose the optimum conditions to determine arsenic in aqueous media Using a Potentiometric method

اختيار الشروط المثلى لتحديد الزرنيخ في الأوساط المائية بطريقة المعايرة الكمونية

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 Publication date 2013
  fields Chemistry
and research's language is العربية
 Created by Shamra Editor




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This research aims to study the effect of certain analytical conditions to determine the arsenic in aqueous media using a Potentiometric, and then choose and adopt the optimum conditions for this determinism. We studied the effect of each of the (PH value, type, concentration puffer, effect of crippling electrolytes) to determine the arsenic in aqueous media and calibration using a standard solution of iodine. We also worked on raising the sensitivity of the method detection limit access to the ppm. It should be noted that technical conditions must be tuned to determine the actual value of the end point calibration and data processing of standard solution (initial velocity and deceleration near the end point calibration). The study showed that the PH value appropriate for calibration of arsenic with iodine (8-9), also found that the response process of arsenic on the electrode platinum has been excellent when using Na2SO4 as puffer with concentration of 0.1 M, which has been successfully used to quantify arsenic As+3 up to detect up to 2 × 10-6M. As it turns out during the study, it was not possible to determine the arsenic presence of copper ions in the solution, while the presence of lead and sulfate ions and chloride was not affective.


Artificial intelligence review:
Research summary
يهدف هذا البحث إلى دراسة تأثير بعض الشروط التحليلية في تحديد الزرنيخ في الأوساط المائية باستخدام طريقة المعايرة الكمونية، ومن ثم اختيار الشروط المثلى لهذا التحديد. تمت دراسة تأثير قيمة PH الوسط، نوع وتركيز المحلول الموقي، وتأثير الشوارد المعيقة على تحديد الزرنيخ باستخدام محلول قياسي من اليود. تم العمل على رفع حساسية الطريقة والوصول بحد الكشف إلى مرتبة ppm. أظهرت الدراسة أن قيمة PH المناسبة للمعايرة الكمونية للزرنيخ باليود تتراوح بين 8-9، وأن استخدام Na2SO4 بتركيز 0.1M كمحلول موقي يعطي استجابة سريعة للزرنيخ على مسرى البلاتين. كما تبين أن وجود شوارد النحاس في المحلول يعوق تحديد الزرنيخ، في حين لا تؤثر شوارد الرصاص والكبريتات والكلوريد. تم تحديد حد الكشف التجريبي للزرنيخ في الأوساط المائية بالطريقة الكمونية ووجد أنه يصل إلى 2x10^-6 mol/l. تمتاز طريقة المعايرة الكمونية بسهولة الاستخدام، السرعة، الحساسية العالية، والدقة، ما يجعلها مناسبة للاستخدام في المجالات البيئية لتحديد تركيز الزرنيخ.
Critical review
دراسة نقدية: رغم أن البحث يقدم إضافة قيمة في مجال تحديد الزرنيخ في الأوساط المائية باستخدام طريقة المعايرة الكمونية، إلا أن هناك بعض النقاط التي يمكن تحسينها. أولاً، لم يتم التطرق بشكل كافٍ إلى مقارنة النتائج مع طرق تحليلية أخرى مستخدمة في هذا المجال، مما يجعل من الصعب تقييم فعالية الطريقة الجديدة بشكل كامل. ثانياً، الدراسة تركز بشكل كبير على الشروط التقنية والتحليلية دون التوسع في التطبيقات العملية لهذه الطريقة في البيئات المختلفة. ثالثاً، كان من الممكن تضمين دراسة تأثير العوامل البيئية الأخرى مثل درجة الحرارة والملوثات الأخرى التي قد تكون موجودة في الأوساط المائية. وأخيراً، لم يتم التطرق إلى التكلفة الاقتصادية لاستخدام هذه الطريقة مقارنة بالطرق الأخرى، وهو عامل مهم يجب أخذه في الاعتبار عند تقييم فعالية أي طريقة تحليلية جديدة.
Questions related to the research
  1. ما هي الشروط المثلى لتحديد الزرنيخ في الأوساط المائية باستخدام المعايرة الكمونية؟

    الشروط المثلى تشمل قيمة PH تتراوح بين 8-9، واستخدام Na2SO4 بتركيز 0.1M كمحلول موقي، وتجنب وجود شوارد النحاس في المحلول.

  2. ما هو حد الكشف التجريبي للزرنيخ باستخدام المعايرة الكمونية؟

    حد الكشف التجريبي للزرنيخ باستخدام المعايرة الكمونية يصل إلى 2x10^-6 mol/l.

  3. كيف يؤثر وجود شوارد النحاس على تحديد الزرنيخ في المحلول؟

    وجود شوارد النحاس يعوق تحديد الزرنيخ لأنه يغير الإشارة الإلكتروكيميائية للزرنيخ ويشكل راسباً أخضر اللون من CuHAsO3.

  4. ما هي المزايا التي تتمتع بها طريقة المعايرة الكمونية مقارنة بالطرق التحليلية الأخرى؟

    تتميز طريقة المعايرة الكمونية بسهولة الاستخدام، السرعة، الحساسية العالية، الدقة، وتكاليفها المنخفضة، مما يجعلها مناسبة للاستخدام في المجالات البيئية.


References used
Luong,H .; Majid, E .; Male, K.Analytical Tools for Monitoring Arsenic in the Environment.Open Analytical Chemistry Journal, 1, 2009, 7-14
Nurulhaidah, D.; Nor , Y.; Tan ,T.; Abdul , A.Electrochemical Sensor for As(III) Utilizing CNTs/ Leucine/Nafion Modified Electrode.Int. J. Electrochem. Sci., 7 ,2012, 175 –185
Jonathan ,O. Arsenic Status and Distribution in Soils at Disused Cattle Dip in South Africa.Bull Environ ContamToxicol , 79, 2007,380–383
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