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Register a new userChoose 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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تناول هذا البحث دراسة تأثير أهم العوامل في المنحنيات الفولط أمبيرومترية للرصاص والنحاس , للوصول إلى الشروط المثلى للتحديد المتزامن لهذين العنصرين , بالطريقة الفولط أمبيرومترية التراكمية الأنودية النبضية التفاضلية DPASV))، وباستخدام مسرى قطرة الزئبق المعلقة(HMDE) بصفة مسرى عامل. أظهرت النتائج أن الشروط المثلى للتحديد المتزامن للرصاص، والنحاس كانت عند استخدام كهرليت من حمض الأزوت بتركيز ، بتطبيق مجال مسح كموني من إلى+150 عند كمون تراكم ، وزمن تراكم 80 sec، وسرعة مسح 40 mV/sec، وسعة نبضة 70 mV، حيث كانت قيم تيار القمة للرصاص ، ، عند كمونات قمّة ، وبتطبيق هذه الشروط تم التوصل لحدود كشف 1.05 μg/l للرصاص, و2.45 μg/l للنحاس، وحسبت الاسترجاعية للتأكد من صحة الطريقة، إذ كانت للرصاص 103.90%، وللنحاس 101.70%¬¬¬¬¬¬¬¬، ولبيان دقة الطريقة بحسب الانحراف المعياري , فكان 0.027mg/l للرصاص, و0.013mg/l للنحاس ، طبقت الطريقة بشروطها المختارة على بعض العيّنات الواقعية فأبدت نجاحاً وكفاءة عالية
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
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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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.
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