Д316 For determination of potassium in the glass on it

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For determination of potassium in the glass on its three 0.1000 g sample was dissolved in a mixture of H2SO4 and HF, solution is evaporated, the residues treated with dilute HCl and transferred to a volumetric flask 250.0 ml. In the second and third flasks was added, respectively, and 10.00 ml 20.00 ml of the standard solution of potassium (P = 250 ug / ml). The solutions were diluted with water to the mark and photometrically flame coal gas - air. The corresponding values of the intensities (at. E.) Are 17.0, 26.0 and 35.0. Determine the mass fraction (%) of potassium in the glass?


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