Manufacturing electrical conductive cell and studying the optimum conditions of its work and analytical applications
Abstract
This research studied the manufacture of a cell for measuring electrical conductivity that consists of two electrodes made of stainless steel with dimensions of (1 × 4) cm, and a thickness (0.5mm) each, and installed on a glass cell with a fixed dimension separated by (1cm). Each electrode in the solution must be (1 × 1) cm to obtain a technical cell constant (1 ). The manufactured cell is linked with the Watston Bridge, which is made of of 3 resistors (two resistors with a value of 5 KΩ and one variable resistance) and the bridge was linked with an alternating current transformer, then the transformer was linked to the Galvano scale, then the optimal conditions for the operation of this cell were studied on a standard solution of potassium chloride (KCl) with a concentration of (0.01M) which has an electrical conductivity (1413 /s / cm) at 25 ℃.The best wave is found to be a sine wave at(1000Hz ) frequency with a potential difference ( 3V) and an alternating current using the temperature coefficient given by the following equation: = to have electrical conductivity measurements at a reference temperature of 25 ℃ .The manufactured cell was applied in direct measurements of different samples and in indirect measurements of adjustments and deposition titrations for analytical and environmental testing, it showed an analytical response with Regular iteration, where the standard deviation [10-580] and the relative standard deviation was [2-8%] and regressive within the field [98 -101%] for the standard solutions.
تناول هذا البحث تصنيع خلية لقياس الناقلية الكهربائية تتألف من الكترودين مصنوعين من مادة الستانليس ستيل المقاوم للصدأ بأبعاد cm(1×4) وبثخانة (0.5mm) لكل منهما, و ثبتا على خلية زجاجية ببعد ثابت يفصل بينهما (1cm) على أن يكون الجزأ المغمور من كل الكترود في المحاليل هو cm(1×1) وذلك للحصول على ثابت الخلية التقني (1c ), ربطت الخلية المصنعة مع جسر واتستون المركب من 3 مقاومات ( مقاومتان بقيمة 5 KΩ ومقاومة واحدة متغيرة ) ووصل الجسر مع محول تيار متناوب إلى تيار مستمر ثمً تم وصل المحول بدوره مع مقياس غلفاني , درست الشروط المثلى لعمل هذه الخلية باستخدام محلول قياسي من كلوريد البوتاسيوم ((KCl تركيزه (0.01M) له ناقليه كهربائية (1413µs/cm) عند درجة الحرارة 25 . إذ وجد أنُ الموجة الأفضل هي الموجة الجيبية عندالتواتر ((1000Hz بفرق كمون ((3V وتيار متناوب وباستخدام معامل درجة الحرارة المعطى بالعلاقة الآتية : = وذلك للحصول على قياسات الناقلية الكهربائية عند درجة الحرارة المرجعية 25 . طبقت أيضا الخلية المصنعة في القياسات المباشرة لعينات عيارية مختلفة وعينات تحليلية ,وفي القياسات غير المباشرة لمعايرات التعديل ومعايرات الترسيب وذلك لاختبارها تحليلياً وبيئيا فأبدت تجاوبا تحليليا بتكرارية منتظمة حيث كان الانحراف المعياري [10-580], والانحراف المعياري النسبي 2-8%] [ ,واسترجاعية ضمن المجال[98 -101%] وذلك من أجل المحاليل العيارية .
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