Page 11 - Customer Needs and Use Assessments (CNUA) of pH Sensors

ACT In Situ pH Sensors Customer Needs and Use Assessment............................................................................ 10
10. How do you calibrate your pH measurement?
Twenty-one respondents listed Tris, AMP, recipe-based SOP’s, and commercial buffers as standards, although
5 had unknown sources. Some used a variety of solutions and suppliers depending on their application.
Combinations of solutions were common. Here is a count based on narratives where a source was given:
Buffers according to Andrew Dickson’s (SOP) recipes (5)
Fisher Scientific (3)
Andrew Dickson as a direct source (2)
HACH (2)
VWR (2)
YSI (2)
The Aurical Company (1)
Oakton (1)
11. Do you participate in international, national, or regional pH sensor comparisons?
There were 38 responses to this question: 78.9 % (30) said “yes;” 21.1% said “no.” Three of the “no” responses
indicate that they have plans to participate, are just beginning a comparison, or anticipate a calibration exercise
in the coming year.