USP Reference Standards are specified for use in conducting official USP–NF tests and assays. USP also provides Reference Standards specified in the Food Chemicals Codex as well as authentic substances—high-quality chemical samples—as a service to analytical, clinical, pharmaceutical and research laboratories. To confirm accuracy and reproducibility, USP Reference Standards are rigorously tested and evaluated by multiple independent laboratories including USP, commercial, regulatory, and academic labs. USP also provide publicly available, official documentary standards for pharmaceutical ingredients in the USP–NF that link directly with our primary reference standards.

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Potassium Nitrate Melting Point Standard, Reference Standard

Supplier: USP

USP Reference Standards are specified for use in conducting official USP–NF tests and assays. To confirm accuracy and reproducibility, USP Reference Standards are rigorously tested and evaluated by multiple independent laboratories including USP, commercial, regulatory, and academic labs. USP also provide publicly available, official documentary standards for pharmaceutical ingredients in the USP–NF that link directly with our primary reference standards.

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VWR®, Electrode Filling and Storage Solution

Supplier: VWR Collection

Calomel-free pH electrode refill solution containing potassium nitrate , VWR®

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Melting point standards, potassium nitrate, traceable to primary standards, Supelco®

Supplier: Merck

Mettler-Toledo Calibration substance ME 51143095, Potassium nitrate, traceable to primary standards (LGC).

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Reference electrode filling solutions

Supplier: Mettler - Toledo

FRISCOLYT-B® (84,4% glycerol, 11% KCl and 4,6% H₂O) is for low temperature samples.

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Cesium chloride-aluminium nitrate buffer solution acc. to Schuhknecht and Schinkel, Supelco®

Supplier: Merck

Cesium chloride-aluminium nitrate buffer solution acc. to Schuhknecht and Schinkel for the determination of sodium, potassium and lithium by flame spectrometry (enth./cont. 50 g/l CsCl + 250 g/l Al(NO₃)₃ * 9 H₂O)

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Filling solutions for pH electrodes, Orion™

Supplier: Thermo Orion

Filling solutions for pH and reference electrodes.

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SODIUM CHLORIDE/POTASSIUM NITRATE (SOL.) 1 * 5 L

Supplier: VWR Collection

SODIUM CHLORIDE/POTASSIUM NITRATE (SOL.) 1 * 5 L

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Filling Solution, Reference, 1 M KNO₃

Supplier: Hach

Filling solution for electrode reference element, potassium nitrate (KNO₃), 1 M solution.

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[EN]POTASSIUM NITRATE, PURATRONIC, 99.99 1 * 1 kg

Supplier: Thermo Fisher Scientific

[EN]POTASSIUM NITRATE, PURATRONIC, 99.99 1 * 1 kg

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Standards for water pollution QC check, inorganics, VHG

Supplier: LGC Standards PROMOCHEM

This solution is intended for use as a quality control check for methods related to measurements of inorganic materials includes conductivity, alkalinity as CaCO₃, chloride, fluoride, nitrite and nitrate, sulphate, potassium, sodium, total dissolved solids and many more.

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Cell culture media, Iscove's Modified Dulbecco's Medium (IMDM)

Supplier: Biowest

In 1976, Guilbert and Iscove demonstrated that precursor cells of erythrocytes and macrophages could be cultured in a reduced-serum medium supplemented with albumin, transferrin, lecithin, and selenium. Iscove's medium is a modification of Dulbecco's Modified Eagle's Medium (DME) containing selenium, additional amino acids and vitamins, sodium pyruvate, HEPES buffer, and potassium nitrate instead of ferric nitrate. Further studies have demonstrated that Iscove's medium will support murine B lymphocytes, haemopoietic tissue from bone marrow, B-cells stimulated with lipopolysaccharide, T-lymphocytes, and a variety of hybrid cells.