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Drink the natural mineral spring examination methodprovenance:Guangzhou food forum  Date
Added:2005-12-12 12.2.1 Measurese the scope originally the method measures the potassium and Nas of lowest examination density distinguish for the 0.05 and 0.01 mgs/ L. The coexistence chemical element interference is smaller under the condition of general, but when a great deal of Na exist, the electricity of the potassium leaves to be subjected to repress, thus making the absorption strength of the potassium enlarge, can increase the Na ion of correspond the quantity in standard aqua, correct.The iron has a little bit the interference, the phosphoric acid salt produce bigger negative interference, can remove after increasing the certain quantity salt.While measurese Na, the hydrochloric acid and the chlorine ions usually make the absorption strength of the Na lower, can increase to correspond to measure the hydrochloric acid to correct in standard aqua. 12.2.2 The method brief summary makes use of the resonance line that the potassium, the Na ground state atomic absorbs to come from the principal to belong to the chemical element hollow cathode light to shoot, and it absorbs the density of the strength and potassium, the Na atom to become the direct proportion.Turn the water kind ducting flames atom in the machine to make after potassium, the Na ion atom turn, distinguish to measurese under its intelligent resonance line 766.5 nms and 589.0 nmses it absorbs the degree, with the standard series more metered.Potassium, the Na content high hour, can adopt the next in order intelligent resonance line 404.5 nms and 330.2 nmses.Two all can use the air- B flames. 12.2.3 Try 12.2.3.1 nitric acid aquas of.(1+1) 12.2.3.2 The potassium standard saves the aqua: together 12.1.3.2. 12.2.3.3 The Na standard saves the aqua: together 12.1.3.3. 12.2.3.4 The potassium, Na mixs the up to standard aqua: take the potassium, the Na standard to save the aqua(12.1.3.2,12.1.3.3), go to the 1.00 mLs to contain the 0.05 mg potassium and 0.05 mg Nas with the pure dilution of water. 12.2.4 Instrument, equipments 12.2.4.1 The atom absorbs to divide the light photometer and its enclosures; hollow cathode light of potassium, Na. 12.2.4.2 The air compressor or a spirit of the air steel. 12.2.4.3 A spirit of B Ȳ steel. 12.2.5 Analytical step 12.2.5.1 The sample measurement 12.2.5.1.1 Press the instrument manual, adjust instrument to go to measure the best appearance of potassium, Na. 12.2.5.1.2 Spray the kind of water directly into the flames, measurese it absorbs the intensity of light. 12.2.5.1.3 Potassium, the Na content in the sample higher hour, can turn to move the burner angle, or use an intelligent resonance line 404.5 nms, the 330.2 nms measurese it absorbs the intensity of light. 12.2.5.2 The school is precise to draw curvilinearly 12.2.5.2.1 The precision absorbs the potassium, Na to mix the up to standard aqua(12.2.3.4) or standards to save the liquid(12.2.3.2,12.2. 3.3), Go together with with the pure dilution of water standard series of the following content: Potassium:0,0.05, the 3 mgs/ L of ¡¡ ( the wave-length 766.5 nms) or 0,1, the 15 mgs/ L of ¡¡ ( the wave-length 404.5 nms). Na:0,0.01, the 0.5 mgs/ L of ¡¡ ( the wave-length 589.0 nms) or 0,1, the 60 mgs/ L of ¡¡ ( the wave-length 330.2 nms). 12.2.5.2.2 Press 12.2.5.1 water kind analysis step to measurese at the same time. 12.2.5.2.3 Take standard density( mg/ L) as horizontal sit the mark, absorb the intensity of light to sit the mark to draw precise curve in school for the ×Ý . 12.2.6 Compute together 12.1.6 12.2.7 The sophistication and accurate degrees are together 12.1.7. |
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