СОРБЦИОННО-СПЕКТРОСКОПИЧЕСКОЕ ОПРЕДЕЛЕНИЕ Pb(II) C БРОМПИРОГАЛЛОЛОВЫМ КРАСНЫМ, ИММОБИЛИЗОВАННЫМ В ОТВЕРЖДЕННЫЙ ЖЕЛАТИНОВЫЙ ГЕЛЬ
Аннотация
Для разработки высокочувствительных методик, сочетающих концентрирование и последующее определение аналита в твердой фазе, особый интерес представляет желатиновый отвержденный гель, нанесенный на прозрачную полимерную матрицу. В данной работе исследована реакция бромпирогаллолового красного с ионами Pb(II) в среде отвержденного желатинового геля и разработана методика сорбционно-спектроскопического определения свинца на основе этой реакции. Оптимальное значение рН раствора 4.5, время контакта индикаторных пленок с раствором 60 минут. Исследовано мешающее влияние посторонних ионов на величину аналитического сигнала свинца. Зависимость оптической плотности пленок от концентрации свинца имеет линейный характер в диапазоне от 1∙10-6 до 1∙10-4 M. Правильность методики определения свинца проверена на реальных объектах.
Ключевые слова: бромпирогаллоловый красный, сорбция, желатин, прозрачный оптический сенсор, свинец, сорбционно-спектроскопический метод анализа
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