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Merck Buffer solution (citric acid/sodium hydroxide/hydrogen chloride) colour: red, traceable to SRM from NIST and PTB pH 4.00 (25 °C)
Merck Water standard 0.1% Certified Reference Material for Karl Fischer Titration 1 g 1 mg H O Aquastar®
Merck Buffer solution (boric acid/potassium chloride/sodium hydroxide), coloured: blue traceable to SRM from NIST and PTB pH 9.00 (20°C) Certipur®
Merck Potassium hydrogen tartrate certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S) = 3.63 / pH(S) = 3.55 (25°C) Certipur®
Merck Lithium ICP Standard traceable to SRM from NIST LiNO in HNO 2-3% 1000 mg/l Li Certipur®
Merck Lead ICP standard traceable to SRM from NIST Pb(NO ) in HNO 2-3% 1000 mg/l Pb Certipur®
Merck Lactose Standard 5 % Certified Reference Material for Karl Fischer Titration Aquastar®
Merck Aluminium ICP standard traceable to SRM from NIST Al(NO ) in HNO 2-3% 10000 mg/l Al Certipur®
Merck Buffer solution (potassium dihydrogen phosphate/disodium hydrogen phosphate) traceable to SRM from NIST and PTB pH 7.00 (25°C) Certipur®
Merck Potassium iodate volumetric standard, secondary reference material for iodometry, trace able to NIST SRM Certipur®