ВИЗУАЛЬНОЕ ТЕСТ-ОПРЕДЕЛЕНИЕ Pb(II) С ИСПОЛЬЗОВАНИЕМ ИНДИКАТОРНОЙ ЖЕЛАТИНОВОЙ ПЛЕНКИ
Аннотация
Среди прозрачных полимерных сорбентов, используемых для концентрирования и последующего определения аналита непосредственно в твердой фазе, особый интерес представляет желатиновый отвержденный гель, нанесенный на прозрачную полимерную матрицу.
Для визуально-тестового определения свинца(II) предложено использовать коммерческую фотопленку с иммобилизованным металлоиндикатором бромпирогаллоловым красным. Найдены оптимальные условия иммобилизации реагента и металлокомплекса в пленке. Установлен состав и оценена устойчивость продуктов индикаторной реакции в растворе и в гетерогенной системе вода/желатиновая пленка. На основе проведенных исследований разработана методика визуального тест-определения свинца, основанная на образовании комплексного соединения Pb(II) c бромпирогаллоловым красным в среде отвержденного желатинового геля. Оценены метрологические характеристики предложенной методики визуального тест-определения Pb(II) с использованием индикаторной пленки: интервал ненадежности обнаружения Pb(II) (1.9-3.7 мкМ), предел обнаружения (3.2 мкМ) и предел определения (3.9 мкМ) металла по цветовой шкале. Правильность определения в модельных растворах и реальных объектах доказана методом «введено-найдено» и независимым методом.
Ключевые слова: бромпирогаллоловый красный, свинец(II), индикаторная желатиновая пленка, иммобилизация, визуальная колориметрия.
DOI: http://dx.doi.org/10.15826/analitika.2014.18.3.009
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