Merck Buffer solution (citric acid/sodium hydroxide/hydrogen chloride) colour: red traceable to SRM from NIST and PTB pH 4.00 (20 °C) Certipur®
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Merck 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)=6.86 /pH(S)=7.41 (25°C) Certipur®
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 Zirconium standard solution traceable to SRM from NIST ZrCl in HCl 2 mol/l 1000 mg/l Zr Certipur®
Merck Buffer solutions (boric acid/potassium chloride/sodium hydroxide), traceable to SRM fro m NIST and PTB pH 11.00 (25°C) Certipur®
Merck Selenium standard solution traceable to SRM from NIST SeO in HNO 0.5 mol/l 1000 mg/l Se Certipur®
Merck Nickel ICP standard traceable to SRM from NIST Ni(NO ) in HNO 2-3% 10000 mg/l Ni Certipur®
Merck Water Standard Oven 1% Certified Reference Material for Karl Fischer oven technique Aquastar®
Merck Lead ICP standard traceable to SRM from NIST Pb(NO ) in HNO 2-3% 1000 mg/l Pb Certipur®