ASTM E70
Full Name
ASTM E70 – Standard Test Method for pH of Aqueous Solutions With the Glass Electrode
Scope
ASTM E70 outlines a procedure for determining the pH of aqueous solutions using a glass electrode and a suitable pH meter. This method finds wide applications across various industries, including environmental monitoring, chemical production, and quality control in manufacturing processes.
Key aspects covered in ASTM E70 include:
- Apparatus: the standard details the necessary equipment, including a pH meter with specified accuracy, a glass electrode sensitive to hydrogen ion activity, a reference electrode, and a temperature compensation device.
- Reagents: it specifies the use of high-purity water and certified standard buffer solutions for calibration.
- Procedure: ASTM E70 provides a step-by-step guide for calibrating the pH meter using standard buffer solutions, measuring the pH of the test solution, and applying temperature corrections if necessary.
- Calculations: the standard describes how to interpret the pH readings obtained from the calibrated meter.
- Precision and bias: ASTM E70 outlines the expected precision and bias of the method based on interlaboratory studies, providing users with a framework for evaluating the reliability of their results.
ASTM E70 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM E70 standard.
Contact us today to discuss your specific testing requirements and let our expertise work for you.
Resources
Keywords
pH; glass electrode; aqueous solutions; calibration; standardization; buffers; temperature; slope; meter; uncertainty; repeatability; reproducibility; ionic strength; junction potential; alkaline error