T 93 Tungstate-Selective Electrode / E. V. Polyakov, L. I. Manakova, L. G. Maksimova, T. A. Denisova, O. I. Gyrdasova // Journal of Analytical Chemistry. - 2002. - Vol. 57, № 5. - P452-455 : il. - Bibliogr. : p. 454-455 (26 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ВОЛЬФРАМАТСЕЛЕКТИВНЫЕ ЭЛЕКТРОДЫ -- СЕНСОРЫ Аннотация: A chemical sensor for tungstate ions has been developed and implemented in two versions on the basis of the poorly soluble nickel(II) hexatungstonickelate(II) heteropoly compound. The electrode function is linear within the range 10–5–10–1 M tungsten for the film electrode and within the range 10–4–10–1 M tungsten for the coated wire electrode at pH 6–9. The slope of the electrode function is 28–29 mV. The time it takes to attain an equilibrium electrode potential is 1–5 min, depending on the ion concentration to be determined. The selectivity coefficients are found for the tungstate-selective electrode in the presence of chloride, sulfate, nitrate, and perchlorate Полный текст |