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Choose the optimal conditions for the simultaneous determination of lead and copper using a hanging mercury drop electrode (HMDE) by differential pulse anodic stripping voltammetry (DPASV)

اختيار الشروط المثلى للتحديد المتزامن للرصاص والنحاس باستخدام مسرى قطرة الزئبق المعلّقة (HMDE) , بالطريقة الفولط أمبيرومترية التراكمية الأنودية النبضيّة التفاضليةDPASV)

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 Publication date 2014
and research's language is العربية
 Created by Shamra Editor




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This research study the effect of the most important conditions on the voltammetric curves of lead and copper to reach the optimal conditions for the simultaneous determination of these elements by Differential pulse anodic stripping voltammetry (DPASV) using a hanging mercury drop electrode (HMDE) as a working electrode. The results showed that the optimal conditions for the simultaneous determination of lead and copper by using nitric acids electrolyte 3M,were when applying scanning field from -700 mV to +150 mV, accumulation potential -800 mV, the time of the accumulation 80 sec, speed rate 40 mV/sec, and the amplitude pulse 70mV, where the peak currents were IP (Pb) = 274.2 nA, IP (Cu) = 630.5 nA, at peak potentials EP (Pb) = -380 mV, EP (Cu) = +40 mV, by applying the previous conditions, the limits of detection reached 1.05μg/l for lead 2.45 μg/l for copper. The retrieval coefficient calculated to make sure accuracy of the method and it reached 103.90% and copper 101.70% and to indicate the precision of the way by the standard deviation was the value of the standard deviation for lead 0.027 mg/l, and copper 0.013 mg/l. the method applied under its own conditions by examined on some of environmental and samples and showed success and high efficiency


Artificial intelligence review:
Research summary
يتناول هذا البحث دراسة تأثير العوامل المختلفة على المنحنيات الفولط أمبيرومترية للرصاص والنحاس للوصول إلى الشروط المثلى للتحديد المتزامن لهذين العنصرين باستخدام مسرى قطرة الزئبق المعلقة (HMDE) والطريقة الفولط أمبيرومترية التراكمية الأنودية النبضية التقاضلية (DPASV). أظهرت النتائج أن الشروط المثلى للتحديد المتزامن للرصاص والنحاس كانت باستخدام كهرليت من حمض الأزوت بتركيز 3M، مع تطبيق مجال مسح كموني من -700 mV إلى +150 mV، وكمون تراكم -800 mV، وزمن تراكم 80 sec، وسرعة مسح 40 mV/sec، وسعة نبضة 70 mV. تم حساب الاسترجاعية للتأكد من صحة الطريقة، إذ بلغت للرصاص 103.90% وللنحاس 101.70%. كما تم تطبيق الطريقة على عينات واقعية وأظهرت نجاحاً وكفاءة عالية.
Critical review
دراسة نقدية: على الرغم من أن البحث يقدم نتائج دقيقة ومهمة في مجال التحديد المتزامن للرصاص والنحاس باستخدام تقنيات كهركيميائية، إلا أنه يمكن توجيه بعض الانتقادات البناءة. أولاً، كان من الممكن توسيع نطاق الدراسة لتشمل عناصر أخرى قد تكون موجودة في العينات البيئية، مما يزيد من شمولية البحث. ثانياً، لم يتم التطرق بشكل كافٍ إلى تأثير العوامل البيئية المختلفة مثل درجة الحرارة والرطوبة على دقة النتائج. ثالثاً، كان من الممكن تقديم مقارنة أكثر تفصيلاً بين هذه الطريقة والطرق التحليلية الأخرى المستخدمة في المجال، مما يعزز من مكانة البحث في السياق العلمي الأوسع.
Questions related to the research
  1. ما هي الشروط المثلى للتحديد المتزامن للرصاص والنحاس باستخدام الطريقة الفولط أمبيرومترية التراكمية الأنودية النبضية التقاضلية؟

    الشروط المثلى هي استخدام كهرليت من حمض الأزوت بتركيز 3M، مع تطبيق مجال مسح كموني من -700 mV إلى +150 mV، وكمون تراكم -800 mV، وزمن تراكم 80 sec، وسرعة مسح 40 mV/sec، وسعة نبضة 70 mV.

  2. ما هي الاسترجاعية المحسوبة للرصاص والنحاس للتأكد من صحة الطريقة؟

    بلغت الاسترجاعية للرصاص 103.90% وللنحاس 101.70%.

  3. ما هي الأجهزة والأدوات المستخدمة في البحث؟

    تم استخدام جهاز التحليل الفولط أميرومتري (Metrohm746/747)، مسرى قطرة الزئبق المعلقة (HMDE)، مسرى فضة كلوريد الفضة (Ag/AgCl)، مسرى البلاتين (Pt)، ميزان تحليلي حساس نوع Sartorius، ماصات ميكروية، جهاز التهضيم باستخدام Metrohm 705 UV، مقياس pH نوع Sartorius PB-11، محاليل عيارية للرصاص والنحاس، محاليل حموض، وماء ثنائي التقطير.

  4. ما هي النتائج التي توصل إليها البحث عند تطبيق الطريقة على عينات مياه صرف صحي معالجة؟

    أظهرت النتائج أن الطريقة كانت ناجحة وكفؤة في تحديد تركيزات الرصاص والنحاس في عينات مياه الصرف الصحي المعالجة، وكانت النتائج كما يلي: في محطة حبيت كان تركيز الرصاص 25.80±2.79 µg/l وتركيز النحاس 15.96±1.07 µg/l، وفي محطة الحارة كان تركيز الرصاص 22.10±1.14 µg/l وتركيز النحاس 32.56±0.24 µg/l، وفي محطة مرج معيربان كان تركيز الرصاص 17.11±1.09 µg/l وتركيز النحاس 6.82±0.26 µg/l.


References used
WANG, J. CHEN, C. Biosorption of heavy metals by Saccharomyces cerevisia. Biotechnology Advances China. Vol 24,2006, 427–451
ABBASI, S. KHODARAHMIYAN, K. ABBASI, F. Simultaneous determination of ultra trace amounts of lead and cadmiumin food samples by adsorptive stripping voltammetry. Food Chemistry Iran. Vol128,2011, 254–257
BRADL, H. B. Heavy Metals in the Environment, 6, interface science and technology, Germany, 2005
NEEDLEMAN, H. Lead poisoning.55, Annual Review of Medicine, California - Santa Cruz, 2004, 209
BREWER,G. J. Risks of Copper and Iron Toxicity during Aging in Humans. Chem. Res. Toxicol. Vol 23, 2010, 319–326
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