John Barron, Technical Director of Reagecon, offers his top 10 tips on how to measure pH accurately and consistently. 1. Selection of the pH Measurement System The selection of an appropriate measurement system that includes metre, electrode, buffers and controls is...
The measurement of cations and anions is of critical importance in almost every industry. Detailed examples of these industries, whilst not exhaustive, are presented in this paper and this list is steadily growing. The level of user expectation in terms of sensitivity...
This short video provides viewers with an overview and short summary of ICP-MS and ICP-OES Standards.
The measurement of cations and anions is of critical importance in almost every industry. The extent of these industries is almost limitless but can broadly be classified as: Industrial Engineering, agriculture, food, pharmaceutical, mining and geology, medicine and medical device, petrochemicals, metal processing, environmental.
Forty years ago methods of choice for measuring cations and anions included colourimetric measurement, flame photometry, ion selective electrodes and atomic absorption spectroscopy. All of these technologies are still widely used but nowadays where greater sensitivity, versatility or efficiency are required, ICP-OES, ICP-MS, ion chromatography and XRF are widely used.
This short video provides viewers with an overview and short summary of Ion Chromatography Standards.
Ion Chromatography (IC), is a relatively recently developed technology that allows for the separation of molecules on the basis of differences in charge properties. In cation exchange chromatography, positively charged molecules are attached to a negatively charged solid support. Conversely, in anion exchange chromatography, negatively charged molecules are attracted to a positively charged solid support.
This short video provides viewers with an overview and short summary of Ion Selective Electrode (ISE) and Ionic Strenght Adjuster (ISA) Standards.
Ion Selective Electrodes, (ISEs) allow specific and quantitative measurement of a wide range of cations, anions and some dissolved gases. These ions can be measured directly like pH measurement, indirectly, which we will discuss later, or by titrimetry. ISEs respond selectively to the relevant ion activity exactly like pH electrodes respond to hydrogen ion activity. However, the measurement technique deviates from pH in that both sample and standards require the addition of an Ionic Strength Adjustor called for short an ISA.
Introduction The measurement of electrical conductivity in liquid or conductivity measurement as it is more commonly known is an extremely popular and important measurement. It is a measurement that is performed daily in a wide range of industries. The correct...
Total Organic Carbon (TOC) is an indirect measure of the quantity of an organic material present in a solution. Usually the solvent of interest is water and the organic material may come from a range of different sources namely: Organic material in source water;...
This short video provides viewers with an overview and short summary of Melting Point Standards.
The Melting Point of a substance is the temperature at which the crystalline phase of the substance changes to its liquid phase. Melting point is defined as the temperature at which the solid and liquid are in equilibrium at a total pressure of 1 atmosphere. Unlike the volume change that accompanies the vaporization of a liquid, the change in volume that takes place upon the melting of a solid is very small.
Reagecon’s Melting Point Standards product range (18 different products) starts at Benzophenone with a Melting Point +47 to +49°C up to Potassium Nitrate with a Melting Point of +333 to +335°C.
Nitrosamines are formed from the chemical reaction between amines and nitrogen containing products that include nitrides, nitrogen oxides or nitrous acids. The products are present extensively in the environment and in the alimentary tract of humans and mammals. These products are now classified as known carcinogens. The products may only be present in various matrices in parts per billion (ppb) or parts per trillion (ppt) levels, so a high degree of sensitivity and high-quality standards are necessary to detect their presence. Reagecon offers ready-to-use, neat (powder form) and multi element standards for nitrosamine analysis.
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