WTW Standards pH Buffers

Standard pH buffer solutions according to DIN/NIST

PTB/NIST traceable standard buffer solutions (work reference buffer solutions) are designed for precision applications.

- Standard buffering solutions as per DIN 19266-01: 2000
- Universal buffering solutions
- High accuracy up to ±0.01 pH (buffer ampoules)

Buffer solutions according to DIN 19266-01: 2000 are the most widely distributed buffer solutions. They are the so-called work reference buffer solutions, and, because of their composition being listed in the standard, they are the best-known buffer solutions. Standard buffering solutions by WTW are tractably certified to PTB/NIST for safe use.

The buffers pH 1.679, pH 4.006, pH 6.865, pH 9.180, and pH 12,47 (PL 2, PL 4, PL 7, PL 9, and PL 12) are available in 250 ml bottles.

They are accurate to ± 0.02 pH at 25 °C, (exception buffer 12.47: ± 0.05 pH). Also, every bottle is labelled with its own lot number and expiration date.
For particular accurate measurements buffers pH 4.01, pH 6.87, and pH 9.18 are also available in glass ampoules with an accuracy of ± 0,01 pH at 25 °C.

• PL 2: Standard (DIN/NIST) buffer solution, 1 bottle with 250 ml: pH 1,679 /1,68
• PL 4: Standard (DIN/NIST) buffer solution, 1 bottle with 250 ml: pH 4.006 /4,01
• PL 7: Standard (DIN/NIST) buffer solution, 1 bottle with 250 ml: pH 6.865 /6,87
• PL 9: Standard (DIN/NIST) buffer solution, 1 bottle with 250 ml: pH 9.180 /9,18
• PL 12:Standard (DIN/NIST) buffer solution, 1 bottle with 250 ml: pH 12.47
• STAPL-4/7/9: Assortment pH 4.01, pH 6.87, pH 9.18: Each 20 glass ampoules with 20 ml
• QSC Kit: pH 4.01, pH 6.87, pH 9.18, each 2 glass ampoules with 20 ml.