Do you want to publish a course? Click here

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)

1861   0   21   0 ( 0 )
 Publication date 2014
and research's language is العربية
 Created by Shamra Editor




Ask ChatGPT about the research

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
rate research

Read More

This research studying the effect of the most important analytical and technical conditions on the voltammetric curves of lead and cadmium in order to choose the optimal conditions for the simultaneous determination of these two elements by Different ial pulse anodic stripping voltammetry (DPASV) using Graphite mercury film electrode(GMFE) as a working electrode. The results showed that the optimum analytical conditions were when using Sodium acetate - acetic acid (0.05M) electrolyte, where pH= 4.6, and a concentration (25mg/l) of Hg2+, CCd:CPb ratio up to 1:10 and conversely, and the optimum technical conditions were when applying scanning field from -1200 to -100mV, accumulation potential Eacc= -1200mV, accumulation time tacc= 120sec, speed rate υ= 120mV/sec, and amplitude pulse ΔE= 50mV. The previous conditions gave ideal voltammetric curves, Ip(Cd)= 6.134µA, Ip(Pb)= 4.966µA, Ep(Cd) = -647 mV, Ep(Pb)= -473 mV. The previous conditions were applied on a standard sample and the limit of detection was (Cd) 0.100µg/l, (Pb) 1.000µg/l, retrieval coefficient R%(Cd)= 100.5%, R%(Pb)= 97.2%, standard deviation SD(Cd)= 0.020mg/l, SD(Pb)= 0.021mg/l; Therefore, that shows the accuracy and precision of the method. The validity of the method under its new conditions was examined on a number of environmental samples and showed success and high efficiency.
The study investigated the possibility of removing heavy metal ions (Cd, Pb) from aqueous solutions using adsorption method on the citrus peel (orange), which is a solid waste available in abundance especially in the Syrian coast as well as easy to use at low cost. The optimal conditions for the simultaneous adsorption of the ions (Cd 2+, Pb 2+) on the surface of orange peel (dry, soft) were determined.The concetration of ions was determined using (DPASV) method Which is characterized by Sensitivity and high accurawcy. The results showed that the optimum adsorption conditions were at pH = 5 , equleibrium time = 60 min, and the initial concentration is ( C0 = 50-200) ppm,The application of the Langmuir and Frienlish models showed that Frienlish model is best fited for expressing the adsorption of Pb ions on the surface of dry and soft orange peel and for expressing the adsorption of Cd ions on the surface of soft orange peel , Langmuir model is best fited for expressing the adsorption of Cd ions on the surface of dry orange peel. The method applied its selected terms to realistic samples of processed and industrial waste water, which showed a unique response as a purification method for the water media.
The glassy carbon electrode has been used as working electrode, to study the electrochemical behavior of Se(IV), by using anodic stripping voltammetric method (ASV) in acidic media HCl. We found that The reason for the absence of analytical signal s expressed on flow any electrodic process due to reduction mechanism of Se(IV) on glassy carbon electrode from Se4+to Se2- and formation H2Se.
The objective of this study is to study some of the optimal analytical conditions for the determination of the Cu2+ ion using potentiometric titration method using the platinum electrode as a working electrode and the AgCL/Ag as a Reference electro de. In this study, the technical conditions were studied (working Electrode type, Reference Electrode type, Direction of titration, delay time, Proportional band, Speed of stirring) and the analytical conditions (pH value, time factor, quantity of solid KI added, electrolyte type and its concentration, detection limit) were studied using oxidation - reduction reactions as the method of iodide titration which applied successfully electrochemical for determine the Cu2+ ion.
This research aims to study the effect of certain analytical conditions to determine the arsenic in in mixed media (water _ alcohol ) where the user either alcohol ( methanol, ethanol , propanol using a Potentiometric, and then selected as conditi ons optimal certified for this determine. The effect of each of the (PH value, type, concentration electrolyte, effect of crippling electrolytes) to determine the arsenic in mixed media ( 50:50 water _ alcohol ) and calibration using a standard solution of iodine.In addition to that, there are 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 (pH=8), also found that the response process of arsenic on the electrode platinum has been excellent when using NaHCO3 as electrolyte with concentration of 1 M, which has been successfully used to quantify arsenic As+3, where the value reached detection limit of arsenic to (1×10-5M) in media (50:50water _ methanol ) , but when you use a media ( 50:50 water _ ethanol ) arrived to the limit of detection (1×10-3 M ), As for propanol arrived to the limit of detection (1×10-2 M). Was calculated as the standard deviation and standard deviation percentile confidence limit in addition to the feedback that indicates the efficiency of the method of determining the concentration of arsenic and detection limit for each medium.
comments
Fetching comments Fetching comments
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا