Standard PH4.01 / PH6.86 / PH9.18 Powder Pack

Specifications:

1. pH Standard Values (at 25°C):
   • pH 4.01 ± 0.02
   • pH 6.86 ± 0.02
   • pH 9.18 ± 0.02
2. Accuracy:
   • pH ±0.02 at 25°C (77°F)
3. Composition:
   • These buffer powders are prepared using high-purity chemicals and are specifically designed to maintain their pH values over time when properly stored.
4. Packaging:
   • Individual sachets containing the buffer powder for single-use.
   • Each sachet typically contains powder to make 250 mL of buffer solution.
5. Storage Instructions:
   • Store the sachets in a dry, cool place away from direct sunlight.
   • Do not use the powder after the expiration date to avoid inaccuracies in pH values.
   • Once the solution is prepared, use it immediately for calibration, or store it in an airtight container for later use.
6. Application:
   • Suitable for calibrating pH meters for a wide range of environments including water treatment, food processing, research labs, and aquaculture.
7. Preparation Instructions:
   • Dissolve the powder content in 250 mL of distilled or deionized water.
   • Stir or shake until the powder is completely dissolved.
   • Ensure the solution is free of contaminants to maintain accuracy.
8. Temperature Dependence:
   • pH values are temperature-dependent. While the standard pH values listed above are valid at 25°C, they may slightly change at different temperatures.
   • Calibration should always be performed at the same temperature as the sample measurement for accurate results.
9. Shelf Life:
   • Typically 2-3 years for the powder form, when stored properly.
   • Once dissolved, the buffer solution should be used within a few days to maintain accuracy.
10. Usage:
    • These buffers can be used to calibrate pH electrodes, ensuring precise and accurate measurements across various applications.
11. Color Indicators:
    • The solution may contain color indicators (optional) to visually differentiate between pH levels:
      • pH 4.01: Often reddish or pink
      • pH 6.86: Usually green or yellow
      • pH 9.18: Often blue or purple