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Webinars (73)- WP-053WP-053Determination of Acid Number (AN) with Titration and NIR Spectroscopy
The acid number (AN) is a measure for the quality of oils and their potential to enhance corrosion. When analyzing fresh, unused oils, the AN is used to ensure the specified quality from the manufacturer, whereas for used oils the AN is determined to observe its increase until a critical level is reached. Although it is generally assumed that the AN correlates to the corrosive potential of the oil, this is not exactly correct, as it is the change of the AN value which indicates this issue. Therefore it is necessary to determine the AN on a regular basis.Several standards already exist to determine AN via titration methods, however it is also possible to measure this parameter via spectroscopic (NIRS) methodology. No matter which technique you choose, Metrohm has you covered with high-performance instruments suitable for these published norms.
- WP-054WP-054Boost efficiency in the QC laboratory: How NIRS helps reduce costs up to 90%
Underestimation of quality control (QC) processes is one of the major factors leading to internal and external product failure, which have been reported to cause a loss of turnover between 10–30%. As a result, many different norms are put in place to support manufacturers with their QC process. However, time to result and the associated costs for chemicals can be quite excessive, leading many companies to implement near-infrared spectroscopy (NIRS) in their QC process. This paper illustrates the potential of NIRS and displays cost saving potentials up to 90%.
- WP-055WP-055Corrosion Best Practice – Creating Pipe-flow Conditions Using a Rotating Cylinder Electrode
Electrochemical measurements utilizing a rotating cylinder electrode (RCE) are widely used in industrial corrosion applications when simulation of realistic pipe conditions are necessary in a lab environment. This white paper allows further insight into the particularities and parameters which govern the electrochemical measurements, in particular measurements performed in turbulent flow conditions, and shows a complete picture of the best practice use of this technique. The annexes provide an overview and short explanation of the parameters and laws specific to the fluid behavior in electrochemical cells with RCE.
- WP-056WP-056Determining dissolved oxygen in water – Titration or direct measurement?
«Dissolved oxygen» describes the amount of oxygen molecules (O2) which are dissolved in a liquid phase under certain conditions. In this white paper, two different methods for the analysis of dissolved oxygen, titration and direct measurement, are compared and contrasted to help analysts determine which method is more suitable for their specific applications. Here, we primarily focus on the determination of dissolved O2 in water. However, the same principle applies for other liquid phases such as non-alcoholic or alcoholic beverages.
- WP-057WP-057FOS/TAC Quotient for the optimization of methane production from biomass
The FOS/TAC value is an important characteristic to assess the status of the fermenter before costly problems arise. The new Eco Titrator from Metrohm allows the determination of this quotient in a fast, cost-efficient, and precise way.
- WP-058WP-058Virus detection: Fast, sensitive, and cost-effective with electrochemical testing
With significant global viral outbreaks becoming the norm rather than generational outliers, it is imperative that fast, sensitive, and cost-effective testing is available to the masses. Screen-printed electrodes (SPEs) allow rapid, widespread testing of populations for infectious disease, without the need of skilled personnel or burdensome equipment in the field. The possibility of point-of-care (POC) testing with SPEs has been exhibited in several recent studies. Metrohm DropSens combines high production capabilites of custom-made SPEs with a valid ISO 13485 certification "Manufacturing of sensors for medical devices", meaning testing procedures developed on these SPEs can be reliably scaled up for larger operations, with easier regulatory approval for commercialization.
- WP-059WP-059Stability-based value of natural oils: Easy to determine with the Rancimat test
Rancidity of oils and fats is a factor which can immediately reduce the sale price of these products to customers in the food and cosmetics industries. Oils which remain stable over longer periods of time are more highly valued as they lead to a higher quality end product. Rancidity is a natural process which occurs as fats and oils age and oxidize, and can be delayed or even stopped by addition of antioxidants at the right time.Determination of rancidity is possible in several ways (e.g., measuring the acid number or peroxide value), though these tests only give information about the current state of the product, with no indication about the remaining shelf life. One analytical method that can measure this time span until spoilage is the Rancimat method, which artificially ages the samples to determine whether antioxidants may be needed to help manufacturers get the full value from their oils.
- WP-060WP-060Multiparameter analysis in fertilizers: Fast and easy via thermometric titration
Agriculture at significant scale without fertilizers is no longer possible in the modern world. To grow a sufficient amount of produce for nearly 8 billion people as well as for domesticated animals and industrial uses, fertilizers of different nutrient compositions are available to cater to the unique needs of various soil types. Information on the fertilizer’s composition (e.g., total nitrogen, phosphorus, and potassium) is available to help select the ideal fertilizer for a specific soil. Conventionally these constituents are determined either gravimetrically (e.g., phosphorus, potassium, or sulfate) or with ICP-OES (e.g., phosphorus or potassium). These methods either have the disadvantages of long analysis times combined with laborious sample preparation (gravimetry), or require expensive instrumentation with high running costs (ICP-OES). This White Paper elaborates how thermometric titration is a fast and inexpensive alternative method to provide information on the content of various nutrients in different fertilizers.
- WP-061WP-061Moisture in petroleum products according to ASTM D6304
Knowledge of the water content in lubricating oils, additives, and similar products is important in the manufacturing, purchase, sale, or transfer of petroleum products to help estimate their quality and performance characteristics. Monitoring the water content in such products can prevent damage to infrastructure and ensure safe operation by avoiding corrosion processes and subsequent engine wear. This White Paper explains the easy determination of moisture in petroleum samples by coulometric Karl Fischer titration according to the three procedures outlined in ASTM Method D6304. A comparison is given between the procedures to determine which is most suitable for different sample types.
- WP-062WP-062Overcoming difficulties in ion measurement: Tips for standard addition and direct measurement
Ion measurement can be conducted in several different ways, e.g., ion chromatography (IC), inductively coupled plasma optical emission spectrometry (ICP-OES), or atom absorption spectroscopy (AAS). Each of these are well-established, widely used methods in analytical laboratories. However, the initial costs are relatively high. In contrast, ion measurement by the use of an ion-selective electrode (ISE) is a promising alternative to these costly techniques. This White Paper explains the challenges which may be encountered when applying standard addition or direct measurement, and how to overcome them in order for analysts to gain more confidence with this type of analysis.
DRP-FOLSOL-AQU-1ML
Fullerenol solution-Aqueous-1 mLDRP-FOLSOL-AQU-5ML
Fullerenol solution-Aqueous-5 mLDRP-GQD
Graphene Quantum DotsDRP-HCELL
H-cell for hydrogen permeation experimentsThis cell consists of two electrochemical compartments in which hydrogen is produced in the load cell and detected in the oxidation cell. It can be used to evaluate hydrogen uptake, permeability and transport in a variety of metal membranes, among other applications.
DRP-HCELLKIT
Hydrogen permeation kit additional cell to be acquired onlyDRP-I-BICAST
i-µStat cable connector for dual screen-printed electrodesConnector that acts as an interface between our dual screen-printed electrodes and Metrohm DropSens potentiostats.
DRP-I-CABSTAT
μStat Cable connector for μStat-i 400 and conventional electrodesμStat Cable connector for μStat-i 400 and conventional electrodes
DRP-I-CABSTAT1
μStat Cable connector for μStat-i 400s and conventional electrodesμStat Cable connector for μStat-i 400s and conventional electrodes
DRP-I-CAST
i-µStat Cable Connector for Screen-Printed ElectrodesConnector that act as an interface between our Screen-Printed Electrodes and Metrohm DropSens potentiostats.
DRP-IRNP-COL
Colloidal Iridium Nanoparticles Solution