Detection of bottled water for beverages and beverages

6.3 Instruments and equipment 6.3.1 pH meter: measuring range 0-14, reading accuracy ≤ 0.02. 6.3.2 Glass electrodes. 6.3.3- Saturated calomel electrode. 6.4 Analysis Step 6.4.1 Glass electrodes should be immersed in water for at least 24 hours before use. 6.4.2 Instrument calibration: After the instrument is turned on for 0.5 hours, follow the instrument manual to perform zero adjustment, temperature compensation, and full scale calibration. 6.4.3 pH positioning: Select a standard buffer solution that is close to the pH of the tested water sample, repeat positioning 1-2 times, and when the pH of the water sample< At 7,0, use potassium hydrogen phthalate buffer solution for positioning, and use sodium tetraborate standard buffer solution or mixed phosphate buffer solution for re positioning; Water sample pH> At 7.0, use sodium tetraborate buffer solution for localization, and use potassium hydrogen phthalate buffer solution or mixed phosphate buffer solution for re localization. 6.4.4. Slowly rinse the 2 electrodes with water several times using a washing bottle, then rinse the water sample 6-8 times, and insert it into the water sample. After 1 minute, directly read the pH from the instrument. Note 1. When the room temperature rises, the saturated potassium chloride solution inside the calomel electrode may change from a saturated state to an unsaturated state, so a certain amount of potassium chloride crystals should be maintained inside the electrode. Note 2: For solutions with a pH greater than 9, a high alkali glass electrode should be used to measure the pH. 7. Soluble Total Solids 7.1105 ℃ Drying Gravimetric Method 7.1.1 Principle Soluble Total Solids is the total amount of inorganic mineral components dissolved in water. The water sample is filtered through a 0.45 pm filter membrane to remove suspended solids. A certain volume of filtrate is evaporated to dryness, and dried at 105 ℃ to constant weight. The evaporation residue content can be measured. The dissolved solid content is added to half of the bicarbonate content (bicarbonate decomposes and loses carbon dioxide during drying and converts into carbonate) to form the total dissolved solid

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