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You are here: Home / Archives for White Papers

European Pharmacopoeia Essential Oils for Changes Optical Rotation Measurements

.1dm - 10mm Polarimeter Cell

Changes to the European Pharmacopoeia Essential Oils regarding Optical Rotation Measurements / Polarimeter Measurements In April 2022 there is a change coming to the European Pharmacopoeia regarding the measurement of essential oils such as Sweet Orange Oil. The revised monograph requires that samples now need to be measured in a 0.1 dm (10mm) length cell […]

Filed Under: White Papers Tagged With: essential oils, European Pharmacopeia, Optical Rotation

Measurement of Concentration Dependence of Refractive Index to Enhance Gel Permeation Chromatography for Polymer Characterization

Measurement of Concentration Dependence of Refractive Index to Enhance Gel Permeation Chromatography for Polymer Characterization Author: Gabor Kiss Date: October 2019 Background: One of the workhorse techniques for polymer characterization is Gel Permeation Chromatography (GPC) which is used to measure molecular weight, molecular weight distribution, degree of branching, radius of gyration, solvent power, etc. The […]

Filed Under: Uncategorized, White Papers Tagged With: dn/dc, dndc, Gel Permeation Chromatography, GPC, refractive index

Ultra Low Volume Refractometer

Ultra Low Volume Refractometer Background Low Volume Refractometer The Ultra Low Volume Refractometer (ULV) option is designed for situations where only a very limited amount of sample is available. This is often related to the biological sciences, but the ULV instrument will handle the same range of materials that a standard refractometer will. Refractometer Design […]

Filed Under: White Papers Tagged With: Ultra Low Volume Refractometer

Polarimeter Cell Filling Solutions

New innovations in Polarimeter cell filling from Rudolph Research. Introducing the Rudolph Research Analytical AutoFill™(Patent Pending) Filling a Polarimeter Cell has never been easier. Polarimeter cell filling made easy – Rudolph Research Analytical developed AutoFill™ (Patent Pending) a simple and easy way for fast and reliable polarimeter cell loading. Polarimeter sample cells are filled without […]

Filed Under: White Papers

UAN Fertilizer Concentration Analysis – Measure RI & Density for % Concentration

Rudolph Research – Fertilizer Industry Application for UAN Analysis. UAN Fertilizer Concentration Analysis – Measure RI & Density for % Concentration UAN 32 is a formulation consisting of 45% Ammonium Nitrate, 35% Urea with 20% water content. The resulting total nitrogen concentration is 32%. Half coming from the Ammonium Nitrate and the other half from […]

Filed Under: White Papers Tagged With: Density Meter, Refratometer, Uan Fertilizer Analysis, UAN Testing

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