Showing 1 - 10 of 82 results

A Complete Solution for the Analysis of Volatile Organic Compounds (VOCs) in Water_2019.1 [AN015]

INTRODUCTION: Demand for lower detection limits of volatile organic compounds in drinking water requires the use of a mixed mode GC-MS system. The ability for simultaneous full scan and selection ion monitoring (SIM) is vital for low-level quantitation. The United State Environmental Protection Agency (US EPA) 524.3 method details the analytical method for the measurement of purgeable organic compounds in water by capillary gas chromatography with mass spectrometry. The SCION Single Quad (SQ) mass spectrometer has a unique feature, Compound Based Scanning (CBS), for easy automated setup and optimisation of complex mixed mode methods. CBS makes use of libraries that store all the essential information about a compound such as retention time, time window, qualifier and quantifier ions. Compounds are loaded directly into a method, scan times are optimised with data acquisition and processing tables synchronised. Managing large number of SIM acquisitions is made easy in mixed mode.

A True Six-Channel Solution for Impurities in Ethylene, May 2019.1 [AN013]

INTRODUCTION: Ethylene is one of the highest volume chemicals produced in the world, with over 100 million metric tons produced annually. Ethylene is primarily used in the manufacture of polyethylene, ethylene oxide and ethylene dichloride. Impurities in ethylene can damage catalysts, resulting in significant replacement costs, reduced product quality, process downtime and decreased yield. Ethylene is manufactured through the use of steam cracking, in which gaseous or light liquid hydrocarbons are heated to 750-790°C in a pyrolysis furnace. Larger hydrocarbons are cracked into smaller hydrocarbons with the formation of unsaturated and olefinic compounds being produced. Ethylene feedstocks must be tested to ensure that only high purity ethylene is delivered for chemical processing.

Analysis of 2,4-DNPH Derivatised Aldehydes by HPLC-DAD [AN0062]

Aldehydes are important compounds regularly use in the chemical industry. Sick house syndrome is a medical condition caused by poor air quality in enclosed indoor spaces and the presence of specific volatile organic compounds (VOCs) such as formaldehyde. It is vital that the level of formaldehyde and associated compounds are regularly measured and controlled especially in working environments in which formaldehyde is handled.
SCION Instruments developed a method for the simultaneous analysis of seven DNPH (2,4- Dinitrophenylhydrazine) derivatised aldehydes plus one derivatised ketone.

Analysis of Boiling Point Distributions in Petroleum Fractions using Simulated Distribution (ASTM D2887A), May 2019.1 [AN008]

Introduction: In many regions ASTM D2887 may be used for determining the boiling point distribution of petroleum products, feedstocks and fractions that have a final boiling point of 538°C or lower. This provides insight into composition and determining intrinsic product value. Even though Physical Distillation is still considered the reference method for distillation, and therefore mandatory in many countries for qualifying fuels, Simulated Distillation (SIMDIST) by gas chromatography offers some significant advantages over the physical procedure, making this technique valuable.

Analysis of Catechins by HPLC-UV [AN0063]

Hot beverages are one of the most widely consumed drinks worldwide, with tea becoming increasingly more popular. Camellia Sinensis, the leaves used during the production of tea. Studies have shown that tea provides several health benefits such as protecting against cardiovascular disease and the management of cholesterol and obesity [1]. The main antioxidants found in tea are catechins.
The composition of catechins in commercial teas vary due to the species of Camellia Sinensis used, horticultural conditions but most importantly, the degree of oxidation during the manufacturing process. Natural processes such as sun drying or steaming the leaves, therefore preventing oxidation, not only protects the tea flavour but also results in high catechin concentrations with lower caffeine amounts whereas harsh leaf processing results in lower catechins and higher caffeine concentrations. Due to the variability in the composition of catechins in tea, it is vital that catechins can be easily identified in a variety of tea products.
SCION Instruments developed a method for the identification of eight catechins commonly found in tea products as well as caffeine, by HPLC-UV Vis.

Analysis of DEHP in Drinking Water by HPLC-DAD [AN0064]

DEHP, bis-(2-ethylhexyl)phthalate, is one of the most prominent phthalate contaminants in drinking water. DEHP is also used as a plasticiser during plastic manufacturing. When ingested, it is a cancer-causing hazard and presents a high risk of liver function disorders. For this reason DEHP is a banned substance during food production, under the Restriction of Hazardous Substances (RoHS) Directive by the EU[1], and levels must be monitored. Although a banned substance, commercial sport drink manufactures have been known to substitute palm oil, a common emulsifier, for the more cost effective DEHP.
SCION Instruments developed a method for the identification of DEHP using HPLC and a Diode Array Detector (DAD)

Analysis of Flavour Compounds in Milk Flavourings by SPME-GC-MS [AN0033]

Dairy based milk powders offer a healthy alternative to fresh milk whilst also being readily available to incorporate into milk flavoured products during
manufacturing. Whilst consumers expect highly soluble and great tasting products, manufacturers need reliable high quality instrumentation for determining the right chemical composition of their products. Gas chromatography is the most commonly used chromatography technique for analysing food products, especially milk powders, for the identification of aroma compounds. The identification of the aroma compounds is vital as they constitute the taste and smell of all food products.
Solid Phase Micro Extraction (SPME) is a solid phase extraction technique that involves the use of a fiber coated in a polymer or sorbent extracting phase. The fiber is exposed to a sample where sample analytes are absorbed onto the fiber coating. The fiber coating should be chosen to suit the type of analyte in the sample. During injection into the GC inlet, desorption occurs and the analytes are introduced to the analytical system. The quantity of analyte extracted by the fiber is proportional to its concentration in the sample as long as equilibrium is reached.

Showing 1 - 10 of 82 results