ФОТОМЕТРИЧЕСКОЕ РЕДОКС-ОПРЕДЕЛЕНИЕ ОКСОАНИОНОВ ХЛОРА И БРОМА В ГИПОХЛОРИТНЫХ ДЕЗИНФИЦИРУЮЩИХ РАСТВОРАХ
Аннотация
C использованием редокс-индикатора метиленового голубого разработаны фотометрические методики для избирательного и высокочувствительного определения оксоанионов хлора и бромат-ионов в растворах дезинфектантов питьевой воды – гипохлоритов натрия и кальция.
Пределы обнаружения анионов составляют, мг/л: 3∙10−2 (ClO−, ClO2−); 5∙10−2 (ClO3−); 3∙10−1 (ClO4−) и 4∙10−4 (BrO3−). Избирательность анализа смеси анионов (предельные массовые отношения) при определении гипохлорита − 1 : 50 (ClO2−), 1 : 100 (ClO3−, ClO4−, BrO3−); хлорита − 1 : 100 (ClO−, ClO3−, ClO4−, BrO3−); хлората − 1 : 100 (ClO−, ClO2−, ClO4−, BrO3−); перхлората − 1 : 100 (ClO−, ClO2−, ClO3−, BrO3−); бромата − 1 : 100 (ClO−, ClO2−), 1 : 200 (ClO3−, ClO4−). Относительная погрешность анализа 10-15 %. Разработанные методики успешно апробированы при определении вышеуказанных оксоанионов в разбавленных растворах гипохлоритов натрия и кальция.
Ключевые слова: оксоанионы хлора, бромат-ионы, редокс-определение, фотометрия, гипохлорит натрия, гипохлорит кальцияПолный текст:
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