1.01645缓冲剂 (di-sodium tetraborate), traceable to SRM from NIST and PTB pH 9.22 (20°C) Certipur?1.01961四草酸钾 Potassium tetraoxalate dihydrate certified secondary standard reference material for pH measurement; directly traceable to primary reference material from NIST/PTB pH (S) = 1.67? (25°C) Certipur?. pH 1.7 (12.6 g/l, H?O, 25 °C)., certified secondary standard reference material for pH measurement; directly traceable to primary reference material from NIST/PTB pH (S) = 1.67? (25°C) Certipur?1.01965邻-苯二甲酸氢钾 Potassium hydrogen phthalate certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S) = 4.00? (25°C) Certipur?. CAS 877-24-7, pH 4.0 (50 g/l, H?O, 20 °C)., certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S) = 4.00? (25°C) Certipur?1.04817氯化钾溶液 3 mol/l1.07200认证二级缓冲液标准品 potassium hydrogen phthalatedirectly traceable to primary SRM from NIST/PTB pH (S) = 4.00? (25°C) Certipur?1.07202认证二级缓冲液标准品 potassium dihydrogen phosphate/di-sodium hydrogen phosphate, directly traceable to primary SRM from NIST/PTB pH(S) = 6.86? (25°C) Certipur?1.07204认证二级缓冲液标准品 potassium tetraoxalate dihydrate, directly traceable to primary SRM from NIST/PTB pH(S) = 1.67? (25°C) Certipur?1.07205认证二级缓冲液标准品 potassium dihydrogen phosphate/di-sodium hydrogen phosphate, directly traceable to primary SRM from NIST/PTB pH(S) = 7.41? (25°C) Certipur?1.07294缓冲液 (di-sodium hydrogen phosphate/potassium dihydrogen phosphate) traceable to SRM from NIST and PTB pH 6.88 (20° C) Certipur?1.07827醋酸盐缓冲液 (acetic acid/sodium acetate) traceable to SRM from NIST and PTB pH 4.66 (20°C) Certipur?1.08420金属钳合剂 溶液 B for the determination of alkaline earth metals in water 1 ml ? 10 mg CaO/l using 100 ml of water Titripur?1.09400缓冲液 (boric acid/potassium chloride/sodium hydroxide) colour coded: yellow, tracable to NIST and PTB pH 10.00 (20°C) Certipur?1.09406缓冲液 (potassium hydrogen phthalate), traceable to SRM from NIST and PTB pH 4.01 (25°C) Certipur?1.09407缓冲液 (potassium dihydrogen phosphate/disodium hydrogen phosphate)traceable to SRM from NIST and PTB pH 7.00 (25°C) Certipur?1.09408缓冲液 (boric acid/potassium chloride/sodium hydroxide)traceable to SRM from NIST and PTB pH 9.00 (25°C) Certipur?1.09409缓冲液 (boric acid/potassium chloride/sodium hydroxide)traceable to SRM from NIST and PTB pH 10.00 (25°C) Certipur?1.09432缓冲液 (glycine/sodium chloride/hydrogen chloride), traceable to SRM from NIST and PTB pH 1.00 (20°C) Certipur?1.09433缓冲液 (citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 2.00 (20°C) Certipur?1.09434缓冲液 (citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 3.00 (20°C) Certipur?1.09435缓冲液 (citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 4.00 (20°C) Certipur?1.09436缓冲液 (citric acid/sodium hydroxide) traceable to SRM from NIST and PTB pH 5.00 (20°C) Certipur?1.09437缓冲液 (citric acid/sodium hydroxide), traceable to SRM from NIST and PTB pH 6.00 (20°C) Certipur?1.09438缓冲液 (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 10.00 (20°C) Certipur?1.09439缓冲液 (di-sodium hydrogen phosphate/potassium dihydrogen phosphate), traceable to SRM from NIST and PTB pH 7.00 (20°C) Certipur?1.09460缓冲液 (boric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 8.00 (20°C) Certipur?1.09461缓冲液 (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 9.00 (20°C) Certipur?1.09462缓冲液 (boric acid/potassium chloride/sodium hydroxide), traceable to SRM from NIST and PTB pH 11.00 (20°C) Certipur?1.09475缓冲液 (citric acid/sodium hydroxide/hydrogen chloride) colour: red traceable to SRM from NIST and PTB pH 4.00 (20 °C) Certipur?1.09476缓冲液 (boric acid/potassium chloride/sodium hydroxide), coloured: blue traceable to SRM from NIST and PTB pH 9.00 (20°C) Certipur?1.09477缓冲液 (di-sodium hydrogen phosphate/potassium dihydrogen phosphate), colour: green traceable to SRM from NIST and PTB pH 7.00 (20°C) Certipur?