Do pH buffers and filling solutions have a shelf-life?
The typical shelf-life for pH buffers and filling solutions is 2 years unopened and 6 months open. For best results, the pH buffer bottles should be sealed promptly to avoid carbon dioxide absorption. Back to Top • What is a good pH electrode slope range? The acceptable slope range is 92% to 102%. Slopes below 92% indicate that the electrode may require cleaning or if cleaning does not help, the electrode should be replaced. Slopes above 102% indicate that the pH buffers are contaminated. General Note: Most Orion pH meters display the slope as a percentage of the theoretical slope (59.12 mV/pH unit). For example, a 98.5% slope is equivalent to a slope of 58.27 mV/pH unit. Back to Top • Do I need an Automatic Temperature Compensation (ATC) probe? The most common cause of error in pH measurements is temperature. The slope of a pH electrode is highly dependent on temperature, and pH buffer values and sample values change with temperature. For the most accurate results an ATC probe is alwa
