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Register a new userDetection of the optimal analytical conditions for the determination of the copper ion using potentiometric titration
دراسة الشروط التحليلية المثلى لتحديد أيون النحاس الثنائي بطريقة المعايرة الكمونية
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Tishreen University ورقة بحثية
Publication date
2018
fields
Chemistry
and research's language is
العربية
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Shamra Editor
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يهدف هذا البحث إلى دراسة بعض الشروط التحليلية المثلى لتحديد أيون Cu2+ بطريقة المعايرة الكمونية باستخدام إلكترود البلاتين كإلكترود عامل و إلكترود الفضة/كلوريد الفضة كإلكترود مقارن. تم في هذا البحث ضبط الشروط التقنية ( نوع الإلكترود العامل –نوع الإلكترود المقارن- منحى المعايرة – زمن التأخير – مجال الكمون النسبي – سرعة التحريك) و من ثم درست الشروط التحليلية مثل (قيمة pH، عامل الزمن، كمية KI الصلبة المضافة، نوع الإلكتروليت و تركيزه، حد الكشف) و ذلك باستخدام تفاعلات الأكسدة و الإرجاع بتطبيق المعايرة اليوديدية و التي طبقت بنجاح إلكتروكيميائيا لتحديد أيون Cu2+.
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 electrode. 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.
References used
RADETZKI*, M. Seven thousand years in the service of humanity-the history of copper,the red metal. Elsevier,34, 2009,176-184
BRADL ,H.Heavy Metals in the Environment: Origin, Interaction and Remediation, 1St Edition, interface science and technology, Germany, 2005,1-282
AHMED*,M.J;.ZANNAT,T.ASimple spectrophotometric Method for the Determination of Copper in Some Real , Environmental , Biological , Food and Soil Samples Using Salicylaldehyde Benzoyl Hydrazone. Pak. J. Anal. Environ .Chem. 13(1), 2012,22-35
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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.
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.
This research study the effect of the proportion of the media (water - alcohol ) to determine where the arsenic used alcohol ( methanol _ ethanol _ propanol ) Using a Potentiometric method. It conducted the calibration process for the specific size o
f the solution studied a specific size of the standard solution of iodine Using a Potentiometric method , after the application of analytical conditions and technical optimal to determine arsenic , and then we studied the effect of mixing ratio on the detection limit for arsenic in mixed media (water _ Alcohol ) .
The study showed that the value of the detection limit of arsenic vary with the type of alcohol used and accounted for in the reaction medium , it reached to (1× 10-7 M) in media (75:25 water _ methanol ) , but when you use a media ( 75:25 water _ ethanol ) arrived to the limit of detection (1×10-4 M ), As for propanol arrived to the limit of detection (1×10-3 M).
where the value reached detection limit of arsenic to (1× 10-5 M) in media ( 50:50 water _ 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).
The study showed that the use of the ratio ( 75:25 water _ alcohol ) gave a higher value limit of detection and therefore better results .
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 detection limit for each medium.
Ion selective electrode of Cu٢+ for determining of copper (II) in acid and
Ammonia Solutions is presented. Optimal conditions and main characteristics
of such electrode have been determined. The effect of anionic surfactants on the
electrode has b
een investigated. The use of protective film such as cellophane,
cellulose acetate, Lavsan, or nitro cellulose could be possible in order to avoid
the difficulties related to the work in surfactant presented in the solutions.
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 (DPA
SV) 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
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