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A prerequisite for an accurate pH calibration is the availability of suitable buffer solutions. Hamilton 4.01 DuraCal liquid buffer solutions are considered "Certified Reference Material" and are tested by a 3rd party lab - DAkkS - against primary reference solutions from PTB and NIST. 4.01 liquid buffers have an accuracy of +/- 0.01 pH over 24 months and +/- 0.02 pH over 60 months. Like all aqueous solutions, the pH value of the buffer is affected by changing temperature. The effects of temperature from 5 to 50°C is shown below in 1 degree increments.

pH vs. Temperature: Reference table for 4.01 DuraCal pH buffer

(Refs 238317, 238217, 238917, 238332, 238194, 238895)

Temp [°C]pH ValueTemp [°C]pH Value
5 4.01 30 4.01
6 4.01 31 4.01
7 4.01 32 4.01
8 4.00 33 4.02
9 4.00 34 4.02
10 4.00 35 4.02
11 4.00 36 4.02
12 4.00 37 4.02
13 4.00 38 4.03
14 4.00 39 4.03
15 4.00 40 4.03
16 4.00 41 4.03
17 4.00 42 4.04
18 4.00 43 4.04
19 4.00 44 4.04
20 4.00 45 4.04
21 4.00 46 4.05
22 4.00 47 4.05
23 4.00 48 4.05
24 4.00 49 4.05
25 4.01 50 4.06
26 4.01
27 4.01
28 4.01
29 4.01