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Merck Tris(hydroxymethyl)aminomethane volumetric standard, secondary reference material for acidimetry, traceable to NIST Standard Reference Material (SRM) Certipur® Reag. Ph Eur,Reag. USP
Merck Phosphorus ICP standard traceable to SRM from NIST H PO in H O 10000 mg/l P Certipur®
Merck Buffer solution (citric acid/sodium hydroxide/hydrogen chloride), traceable to SRM from NIST and PTB pH 3.00 (25°C) Certipur®
Merck Buffer solution (glycine/sodium chloride/hydrogen chloride), traceable to SRM from NIST and PTB pH 1.00 (25°C) Certipur®
Merck Certified sec. standard reference buffer solution potassium dihydrogen phosphate/di- sodium hydrogen phosphate, directly traceable to primary SRM from NIST/PTB pH(S) = 7.41 (25°C) Certipur®
Merck Lead ICP standard traceable to SRM from NIST Pb(NO ) in HNO 2-3% 10000 mg/l Pb Certipur®