pH Flashcards
1
Q
How long are the pH buffers good for after opening?
A
6 months
2
Q
Maximum holding time for pH samples
A
15 min from collection
3
Q
Which buffers are used in a 2 point calibration?
A
pH 7 and pH 10
4
Q
Which buffer is used as the check buffer
A
pH 4
5
Q
What is the acceptable range for the slope?
A
-56 to -62 mV
6
Q
4.0 buffer acceptance criteria
A
+/- 0.1 pH units (3.9-4.1)
7
Q
How often does a slope need to be generated/ calibrated
A
once per shift (8 hours)
8
Q
How often does a 4.0 verification need to be done
A
once per week
9
Q
in-line pH meter requirements
A
compared to bench reading once a day, +/- 0.2 pH units
