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-1 (~20 ng mL -1 ), e pode ser usado por um período superior a oito semanas, sem alterações significantes na resposta. A seletividade do sensor, com relação a outros ânions comuns, orgânicos e inorgânicos (por exemplo, cloreto, brometo, iodeto, nitrato, sulfito, sulfato, carbonato, perclorato, cianeto, tiocianato, diidrogenofosfato, pirofosfato de tetrasódio e íons tripolifosfato de sódio) é excelente. A utilidade prática do sensor foi demonstrada pelo uso como eletrodo indicador na titulação potenciométrica de MHP com íons Ba 2+ e pela determinação direta de MHP em amostras de fertilizantes granular e líquido e em amostras de água de descarte. A highly selective and sensitive monohydrogen phosphate (MHP) sensor has been fabricated by constructing a poly vinyl chloride (PVC) matrix membrane containing a new oxo-molybdenum methyl-salen (MS) as a neutral carrier, hexadecyltrimethyl ammonium bromide (HTAB) as a cationic additive, benzylacetate (BA) as a plasticizing solvent mediator. The membrane sensor exhibits linear potential response in the concentration range of 1.0 ×10 -1 - 4.0 × 10 -7 mol L -1 of -1 ), and it can be used over a period of eight weeks without significant changes in its response. The selectivity of the sensor with respect to other common organic and inorganic anions (e.g. Chloride, bromide, iodide, nitrate, sulfite, sulfate, carbonate, perclorate, cyanide, thiocyanate, dihydrogen phosphate, tetrasodium pyrophosphate, and sodium tripoly phosphate ions) is excellent. The practical utility of the sensor has been demonstrated by using it as an indicator electrode in the potentiometric titration of MHP with Ba 2+ ions and for the direct determination of MHP in granular and liquid fertilizer samples as well waste water samples.

Anion recognition: fabrication of a highly selective and sensitive HPO4(2-) PVC sensor based on a oxo-molybdenum methyl-salen