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pH Buffers

For the calibration of pH-testers and pH-meters. These standards are made from analytical grade materials.

Buffer pH = 4.01

Potassium phthalate buffer according to NIST, colour coded red, pH = 4.01 @ 25°C.

  • Buffer pH = 4.01, 250 mL ... $16.80 + GST
  • Buffer pH = 4.01, 500 mL ... $24.00 + GST
  • Buffer pH = 4.01, 1000 mL ... $34.90 + GST

Buffer pH = 6.86

Phosphate buffer according to NIST, colour coded yellow, pH = 6.86 @ 25°C.

  • Buffer pH = 6.86, 250 mL ... $16.40 + GST
  • Buffer pH = 6.86, 500 mL ... $23.30 + GST
  • Buffer pH = 6.86, 1000 mL ... $33.50 + GST

Buffer pH = 7.00

Phosphate buffer, colour coded green, pH = 7.00 @ 25°C.

  • Buffer pH = 7.00, 250 mL ... $16.50 + GST
  • Buffer pH = 7.00, 500 mL ... $23.50 + GST
  • Buffer pH = 7.00, 1000 mL ... $33.70 + GST

Buffer pH = 9.18

Borate buffer according to NIST, colour coded turquoise, pH = 9.18 @ 25°C.

  • Buffer pH = 9.18, 250 mL ... $16.00 + GST
  • Buffer pH = 9.18, 500 mL ... $22.50 + GST
  • Buffer pH = 9.18, 1000 mL ... $31.90 + GST

Buffer pH = 10.01

Carbonate buffer according to NIST, colour coded blue, pH = 10.01 @ 25°C.

  • Buffer pH = 10.01, 250 mL ... $16.10 + GST
  • Buffer pH = 10.01, 500 mL ... $22.70 + GST
  • Buffer pH = 10.01, 1000 mL ... $32.30 + GST

pH Values of Standard Buffers as Function of Temperature:

Temperature Buffer 4.01 Buffer 6.86 Buffer 9.18 Buffer 10.01
0°C 4.003 6.984 9.464 10.317
5°C 3.999 6.951 9.395 10.245
10°C 3.998 6.923 9.332 10.179
15°C 3.999 6.900 9.276 10.118
20°C 4.002 6.881 9.225 10.062
25°C 4.008 6.865 9.180 10.012
30°C 4.015 6.853 9.139 9.966
35°C 4.024 6.844 9.102 9.925
40°C 4.035 6.838 9.068 9.889
45°C 4.047 6.834 9.038 9.856
50°C 4.060 6.833 9.011 9.828