pH Buffers for Calibration

Certipur® Buffer Solutions and Substances for Precise pH Calibration

Our wide range of pH calibration buffers offers ideal product and packaging for your individual need. All buffer solutions are certified reference materials according to ISO Guide 34 and qualified in our DIN EN ISO /IEC 17025 accredited laboratory. They are all traceable to NIST (National Institute of Standards and Technology, USA) and PTB (Physical Technical Institute, Germany) primary reference materials. Buffers solutions are offered in PE bottles, pre-portioned in sachets and in Titripac packaging, measured at 20 °C or 25 °C.

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1.01203 Potassium chloride solution (nominal 1.41 mS/cm) certified reference material for the measurement of electrolytic conductivity (c=0.01 mol/l) Certipur®
1.01254 Potassium chloride solution (nominal 12.8 mS/cm) certified reference material for the measurement of electrolytic conductivity (c=0.1 mol/l) Certipur®
1.01553 Potassium chloride solution (nominal 1.41 mS/cm) certified reference material for the measurement of electrolytic conductivity, traceable to PTB and NIST (c=0.01 mol/l) Certipur®
1.01554 Potassium chloride solution (nominal 12.8 mS/cm) certified reference material for the measurement of electrolytic conductivity, traceable to PTB and NIST (c=0.1 mol/l) Certipur®
1.01557 Potassium chloride solution (nominal 0.147 mS/cm) certified reference material for the measurement of electrolytic conductivity (c=0.001 mol/l) Certipur®
1.01586 Potassium chloride solution (nominal 0.147 mS/cm) certified reference material for the measurement of electrolytic conductivity, traceable to PTB and NIST (c = 0.001 mol/l) Certipur®
1.01645 Buffer solution (di-sodium tetraborate), traceable to SRM from NIST and PTB pH 9.22 (20°C) Certipur®
1.01811 Potassium chloride solution ( nominal 0.015 mS/cm) certified reference material for the measurement of electrolytic conductivity, traceable to PTB and NIST (c=0.0001 mol/l) Certipur®
1.01960 Potassium dihydrogen phosphate/ di-sodium hydrogen phosphate certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S)=6.86₅ /pH(S)=7.41₃ (25°C) Certipur®
1.01961 Potassium tetraoxalate dihydrate Potassium tetraoxalate dihydrate certified secondary standard reference material for pH measurement; directly traceable to primary reference material from NIST/PTB pH (S) = 1.67₉ (25°C) Certipur®. pH 1.7 (12.6 g/l, H₂O, 25 °C)., certified secondary standard reference material for pH measurement; directly traceable to primary reference material from NIST/PTB pH (S) = 1.67₉ (25°C) Certipur®
1.01962 Sodium hydrogen carbonate/sodium carbonate certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S) = 10.01₂ (25°C) Certipur®
1.01963 Potassium hydrogen tartrate Potassium hydrogen tartrate certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S) = 3.63₉ / pH(S) = 3.55₇ (25°C) Certipur®., certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S) = 3.63₉ / pH(S) = 3.55₇ (25°C) Certipur®
1.01964 di-Sodium tetraborate decahydrate di-Sodium tetraborate decahydrate certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S)=9.18₀ (25°C) Certipur®. CAS 1303-96-4., certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S)=9.18₀ (25°C) Certipur®
1.01965 Potassium hydrogen phthalate Potassium hydrogen phthalate certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S) = 4.00₅ (25°C) Certipur®. CAS 877-24-7, pH 4.0 (50 g/l, H₂O, 20 °C)., certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S) = 4.00₅ (25°C) Certipur®
1.04817 Potassium chloride solution 3 mol/l
1.04818 Potassium chloride solution saturated with silver chloride 3 mol/l
1.04875 Potassium dihydrogen phosphate solution (buffer stock solution) 1/₁₅ mol/l
1.06587 di-Sodium hydrogen phosphate solution (buffer stock solution) 1/15 mol/l
1.07200 Certified sec. standard reference buffer solution potassium hydrogen phthalatedirectly traceable to primary SRM from NIST/PTB pH (S) = 4.00₅ (25°C) Certipur®
1.07202 Certified sec. standard reference buffer solution potassium dihydrogen phosphate/di-sodium hydrogen phosphate, directly traceable to primary SRM from NIST/PTB pH(S) = 6.86₅ (25°C) Certipur®
1.07203 Certified sec. standard reference buffer solution di-sodium tetraborate decahydrate, directly traceable to primary SRM from NIST/PTB pH(S) = 9.18₀ (25°C) Certipur®
1.07204 Certified sec. standard reference buffer solution potassium tetraoxalate dihydrate, directly traceable to primary SRM from NIST/PTB pH(S) = 1.67₉ (25°C) Certipur®
1.07205 Certified sec. standard reference buffer solution potassium dihydrogen phosphate/di-sodium hydrogen phosphate, directly traceable to primary SRM from NIST/PTB pH(S) = 7.41₃ (25°C) Certipur®
1.07294 Buffer solution (di-sodium hydrogen phosphate/potassium dihydrogen phosphate) traceable to SRM from NIST and PTB pH 6.88 (20° C) Certipur®
1.07827 Buffer solution (acetic acid/sodium acetate) traceable to SRM from NIST and PTB pH 4.66 (20°C) Certipur®
1.08419 Titriplex® solution A for the determination of alkaline earth metals in water 1 ml ≙ 56 mg CaO/l using 100 ml of water
1.08420 Titriplex® solution B for the determination of alkaline earth metals in water 1 ml ≙ 10 mg CaO/l using 100 ml of water Titripur®
1.08446 Titriplex® III solution for 1000 ml, c(Na₂-EDTA 2 H₂O) = 0.01 mol/l Titrisol®
1.09400 Buffer Solution (boric acid/potassium chloride/sodium hydroxide) colour coded: yellow, tracable to NIST and PTB pH 10.00 (20°C) Certipur®
1.09406 Buffer solution (potassium hydrogen phthalate), traceable to SRM from NIST and PTB pH 4.01 (25°C) Certipur®
1.09407 Buffer solution (potassium dihydrogen phosphate/disodium hydrogen phosphate)traceable to SRM from NIST and PTB pH 7.00 (25°C) Certipur®
1.09408 Buffer solution (boric acid/potassium chloride/sodium hydroxide)traceable to SRM from NIST and PTB pH 9.00 (25°C) Certipur®
1.09409 Buffer solution (boric acid/potassium chloride/sodium hydroxide)traceable to SRM from NIST and PTB pH 10.00 (25°C) Certipur®
1.09432 Buffer solution (glycine/sodium chloride/hydrogen chloride), traceable to SRM from NIST and PTB pH 1.00 (20°C) Certipur®
1.09433 Buffer solution (citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 2.00 (20°C) Certipur®
1.09434 Buffer solution (citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 3.00 (20°C) Certipur®
1.09435 Buffer solution (citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 4.00 (20°C) Certipur®
1.09436 Buffer solution (citric acid/sodium hydroxide) traceable to SRM from NIST and PTB pH 5.00 (20°C) Certipur®
1.09437 Buffer solution (citric acid/sodium hydroxide), traceable to SRM from NIST and PTB pH 6.00 (20°C) Certipur®
1.09438 Buffer solution (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 10.00 (20°C) Certipur®
1.09439 Buffer solution (di-sodium hydrogen phosphate/potassium dihydrogen phosphate), traceable to SRM from NIST and PTB pH 7.00 (20°C) Certipur®
1.09441 Buffer solution (glycine/sodium chloride/hydrogen chloride), traceable to SRM from NIST and PTB pH 1.00 (25°C) Certipur®
1.09442 Buffer solution (citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 2.00 (25°C) Certipur®
1.09444 Buffer solution (citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 3.00 (25°C) Certipur®
1.09445 Buffer solution (citric acid/sodium hydroxide/hydrogen chloride) traceable to SRM from NIST and PTB pH 4.00 (25°C) Certipur®
1.09446 Buffer solution (citric acid/sodium hydroxide) traceable to SRM from NIST and PTB pH 5.00 (25°C) Certipur®
1.09460 Buffer solution (boric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 8.00 (20°C) Certipur®
1.09461 Buffer solution (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 9.00 (20°C) Certipur®
1.09462 Buffer solution (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 11.00 (20°C) Certipur®
1.09475 Buffer solution (citric acid/sodium hydroxide/hydrogen chloride) colour: red traceable to SRM from NIST and PTB pH 4.00 (20 °C) Certipur®
1.09476 Buffer solution (boric acid/potassium chloride/sodium hydroxide), coloured: blue traceable to SRM from NIST and PTB pH 9.00 (20°C) Certipur®
1.09477 Buffer solution (di-sodium hydrogen phosphate/potassium dihydrogen phosphate), colour: green traceable to SRM from NIST and PTB pH 7.00 (20°C) Certipur®
1.09478 Ammonium buffer solution for complexometry (ammonium chloride/ammonia) pH = 10-11 Titripur®
1.09864 Ammonium iron(II) sulfate solution for 250 mlc[(NH₄)₂ Fe(SO₄)₂] = 0.1 mol/l (0.1 N) Titrisol®
1.09879 Buffer concentrate for buffer solution acc. to WEISE for 1000 ml of solution (phosphate), pH 7.20 Titrisol®
1.09880 Buffer concentrate (boric acid/potassium chloride/sodium hydroxide), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 11.00 ± 0.05 (20°C) Titrisol®
1.09881 Buffer concentrate (glycine/hydrochloric acid), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 1.00 ± 0.02 (20°C) Titrisol®
1.09882 Buffer concentrate (citrate/hydrochloric acid), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 2.00 ± 0.02 (20°C) Titrisol®
1.09883 Buffer concentrate (citrate/hydrochloric acid), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 3.00 ± 0.02 (20°C) Titrisol®
1.09884 Buffer concentrate (citrate/hydrochloric acid), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 4.00 ± 0.02 (20°C) Titrisol®
1.09885 Buffer concentrate (citrate/sodium hydroxide), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 5.00 ± 0.02 (20°C) Titrisol®
1.09886 Buffer concentrate (citrate/sodium hydroxide), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 6.00 ± 0.02 (20°C) Titrisol®
1.09887 Buffer concentrate (phosphate), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 7.00 ± 0.02 (20°C) Titrisol®
1.09888 Buffer concentrate (borate/hydrochloric acid), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 8.00 ± 0.02 (20°C) Titrisol®
1.09889 Buffer concentrate (boric acid/potassium chloride/sodium hydroxide), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 9.00 ± 0.02 (20°C) Titrisol®
1.09890 Buffer concentrate (boric acid/potassium chloride/sodium hydroxide), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 10.00 ± 0.05 (20°C) Titrisol®
1.09892 Buffer concentrate (phosphate/sodium hydroxide), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 12.00 ± 0.05 (20°C) Titrisol®
1.09893 Buffer concentrate (potassium chloride/sodium hydroxide), traceable to SRM of NIST and PTB for 500 ml buffer solution, pH 13.00 ± 0.05 (20°C) Titrisol®
1.09900 Ammonium thiocyanate solution for 1000 ml, c(NH₄SCN) = 0.1 mol/l (0.1 N) Titrisol®
1.09905 Bromide bromate solution for 1000 ml, c(Br₂) = 0,05 mol/l (0.1 N) Titrisol®
1.09909 Sodium thiosulfate solution for 1000 ml, c(Na₂S₂O₃) = 0,01 mol/l (0.01 N) Titrisol®
1.09912 Sulfuric acid 1.000 l for the preparation of dilute volumetric solutions or for direct use c(H₂SO₄) = 2.5 mol/l (5 N) Combi-Titrisol®
1.09914 Iodide iodate solution for 1000 ml, c(I₂) = 1/128 mol/l (1/64 N) Titrisol®
1.09917 Potassium iodate solution for 1000 ml, c(KIO₃) = 1/₆₀ mol/l (0.1 N) Titrisol®
1.09918 Potassium hydroxide solution for 1000 mlc(KOH) = 1 mol/l (1 N) Titrisol®
1.09919 Potassium hydroxide solution for 1000 mlc(KOH) = 0.5 mol/l (0.5 N) Titrisol®
1.09921 Potassium hydroxide solution for 1000 ml, c(KOH) = 0.1 mol/l (0.1 N) Titrisol®
1.09925 Potassium bromate solution for 1000 ml, c(KBrO₃) = 1/₆₀ mol/l (0.1 N) Titrisol®
1.09928 Potassium dichromate solution for 1000 ml, c(K₂Cr₂O₇) = 1/₆₀ mol/l (0.1 N) Titrisol®
1.09930 Potassium permanganate solution for 1000 ml, c(KMnO₄) = 0,002 mol/l (0.01 N) Titrisol®
1.09932 Oxalic acid solution for 1000 ml, c(C₂H₂O₄) = 0.005 mol/l (0.01 N) Titrisol®
1.09935 Potassium permanganate solution for 1000 ml, c(KMnO₄) = 0.02 mol/l (0.1 N) Titrisol®
1.09940 Sodium carbonate solution for 1000 ml, c(Na₂CO₃) = 0.05 mol/l (0.1 N) Titrisol®
1.09944 Acetic acid for 1000 ml, c(CH₃COOH) = 0.1 mol/l (0.1 N) Titrisol®
1.09945 Sodium chloride solution for 1000 ml, c(NaCl) = 0.1 mol/l (0.1 N) Titrisol®
1.09950 Sodium thiosulfate solution for 1000 ml, c(Na₂S₂O₃) = 0.1 mol/l (0.1 N) Titrisol®
1.09951 Acetic acid for 500 ml, c(CH₃COOH) = 1 mol/l (1 N) Titrisol®
1.09956 Sodium hydroxide solution for 1000 ml, c(NaOH) = 1 mol/l (1 N) Titrisol®
1.09957 Sodium hydroxide solution for 1000 ml, c(NaOH) = 0.5 mol/l (0.5 N) Titrisol®
1.09958 Sodium hydroxide solution for 1000 ml, c(NaOH) = 0.25 mol/l (0.25 N) Titrisol®
1.09959 Sodium hydroxide solution for 1000 ml, c(NaOH) = 0.1 mol/l (0.1 N) Titrisol®
1.09961 Sodium hydroxide solution for 1000 ml, c(NaOH) = 0.01 mol/l (0.01 N) Titrisol®
1.09962 Barium chloride solution for 1000 ml, c(BaCl₂) = 0.05 mol/l (0.1 N) Titrisol®
1.09964 Nitric acid solution for 1000 ml , c(HNO₃) = 0.1 mol/l (0.1 N) Titrisol®
1.09965 Oxalic acid solution for 1000 ml, c(C₂H₂O₄) = 0.05 mol/l (0.1 N) Titrisol®
1.09966 Nitric acid for 1000 ml, c(HNO₃) = 1 mol/l (1 N) Titrisol®
1.09970 Hydrochloric acid for 1000 ml, c(HCl) = 1 mol/l (1 N) Titrisol®
1.09971 Hydrochloric acid for 1000 ml, c(HCl) = 0.5 mol/l (0.5 N) Titrisol®
1.09973 Hydrochloric acid for 1000 ml, c(HCl) = 0.1 mol/l (0.1 N) Titrisol®
1.09974 Hydrochloric acid for 1000 ml, c(HCl) = 0.01 mol/l (0.01 N) Titrisol®
1.09981 Sulfuric acid for 1000 ml, c(H₂SO₄) = 0.5 mol/l (1 N) Titrisol®
1.09982 Sulfuric acid for 1000 ml, c(H₂SO₄) = 0.005 mol/l (0.01 N) Titrisol®
1.09984 Sulfuric acid for 1000 ml, c(H₂SO₄) = 0.05 mol/l (0.1 N) Titrisol®
1.09990 Silver nitrate solution for 1000 ml, c(AgNO₃) = 0.1 mol/l (0.1 N) Titrisol®
1.09991 Zinc sulfate solution for 1000 ml, c(ZnSO₄) = 0.1 mol/l (0.1 N) Titrisol®
1.09992 Titriplex® III solution for 1000 ml, c(Na₂-EDTA 2 H₂O) = 0.1 mol/l Titrisol®
1.99001 Buffer solution (potassium hydrogen phthalate), traceable to SRM from NIST and PTB pH 4.01 (25°C) Certipur®
1.99002 Buffer solution (potassium dihydrogen phosphate/di-sodium hydrogen phosphate), traceable to SRM from NIST and PTB pH 7.00 (25°C) Certipur®
1.99003 Buffer solution (boric acid/potassium chloride/sodium hydroxide solution), traceable to SRM from NIST and PTB pH 9.00 (25°C) Certipur®
1.99004 Buffer solution (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 10.00 (25°C) Certipur®
1.99005 Buffer solutions traceable to SRM from NIST and PTB 10 x pH 4.01 (phthalate) 10 x pH 7.00 (phosphate) 10 x pH 9.00 (borate) pH 4.01/pH 7.00/pH 9.00 (25°C) Certipur®
1.99006 Buffer solutions traceable to SRM from NIST and PTB 10 x pH 4.01 (phthalate) 10 x pH 7.00 (phosphate) 10 x pH 10.00 (borate) pH 4.01/pH 7.00/pH 10.00(25°C) Certipur®
1.99012 Buffer Solution (citric acid, sodium hydroxide, hydrogen chloride) tracable to SRM from NIST and PTB pH 2.00 (25°C) Certipur®
1.99019 Buffer solution (di-sodium tetraborate)tracable to SRM from NIST and PTB pH 9.18 (25°C) Certipur®
1.99021 Buffer Solution (boric acid, sodium hydroxide, potassium chloride) tracable to SRM from NIST and PTB pH 11.00 (25°C) Certipur®
1.99022 Buffer Solution (di-sodium hydrogen phosphate/sodium hydroxide) traceable to SRM from NIST und PTB pH 12.00 (25°C) Certipur®
1.99036 Buffer solution (citric acid/sodium hydroxide), traceable to SRM from NIST and PTB pH 6.00 (25°C) Certipur®
1.99038 Buffer solution (boric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 8.00 (25°C) Certipur®
1.99041 Buffer solutions (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 11.00 (25°C) Certipur®
1.99050 Buffer solution (boric acid/potassium chloride/sodium hydroxide) colour coded: blue, traceable to NIST and PTB pH 10.00 (25°C) Certipur®
1.99054 Buffer solution (citric acid/sodium hydroxide/hydrogen chloride) colour: red, traceable to SRM from NIST and PTB pH 4.00 (25 °C)
1.99057 Buffer solution (di-sodium hydrogen phosphate/potassium dihydrogen phosphate), colour:yellowtraceable to SRM from NIST and PTB pH 7.00 (25°C) Certipur®
1.99064 Buffer solution (citric acid/sodium hydroxide/hydrogen chloride) tracable to SRM from NIST and PTB pH 4.00 (25°C) Certipur®