Product category:
Titration equipment
News Release from: Metrohm UK | Subject: 841 KF titrator
Edited by the Laboratorytalk Editorial
Team on 01 February 2005
Trace metal analysis in agriculture
Instrument is capable of reaching ppb to ppt levels of trace elements accurately, usually for a fraction of the cost of spectroscopic techniques and without the need for separation
In today's environment of increased scientific and physiological knowledge it is no surprise that this knowledge has transferred to the agricultural sector, says Metrohm It is becoming increasingly apparent trace metals in the food line help stock to thrive and remain disease free
This article was originally published on Laboratorytalk on 2 Jul 2008 at 8.00am (UK)
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Analysis of mercury in waters using voltammetry
Jonathan Bruce, Applications Manager for Metrohm UK, provides this comprehensive introduction to analysis of mercury in waters
On-line lactic acid analysis of dairy products
Determination of lactic acid in milk and associated dairy products is an extremely common laboratory application and has key product quality control use in a modern dairy
Magnesium, for example, has been proven to prevent grass tetany, selenium is known to be a major factor in the fertility of cows, cobalt is a necessary supplement for the well being of sheep.
This knowledge has led to the testing of the foodstuffs that are given to stock and supplements added as considered necessary.
The Computrace 797 is capable of reaching ppb to ppt levels of trace elements accurately, usually for a fraction of the cost of spectroscopic techniques and without the need for separation of the metals either using solvent extraction or co-precipitation, says Metrohm.
Further reading
Analysis of sugars in chocolate bars
The analysis of the different sugars present in a bar of chocolate can reliably and affordably be quantified using pulsed amperometric detection (PAD) with the 817 Bioscan from Metrohm
Determining aluminium level in deodorant matrix
Body odour is never pleasant, and we've all been crammed on a train or been in a busy shopping centre and noticed the distinctive smell of stale sweat
Fast, accurate, Karl Fischer for difficult samples
The water content of many samples is difficult to determine because they are only slightly soluble in alcohols, contaminate the titration cell or undergo side reactions with the Karl Fischer reagent
Heyrovsky first introduced polarography in 1922.
The term voltammetry is applied to designate the current-voltage measurement obtained at a given electrode.
Polarography is a special case of voltammetry referring to the current-voltage measurement acquired using a dropping mercury electrode with a constant flow of mercury drops.
Stripping voltammetry uses the same instrumentation as traditional polarography but a stationary electrode such as the hanging mercury dropping electrode (HMDE) is used.
The voltammetric measurement is performed on a stationary mercury drop allowing one to achieve considerable increases in sensitivity.
The jump in sensitivity is possible by electrochemical pre-concentration of the metals in question at the surface of the stationary electrode before the current-voltage curve is recorded.
The recorded current is the re-dissolution (reoxidation) current of the pre-concentrated metal traces.
Voltammetry today represents a refined, clean, simple technique that offers outstanding limits of detection and is now the fastest growing analytical technique for trace analysis.
Dry matter digestibility ( DMD) in animal foodstuffs.
In livestock farming the major cost is the supply of foodstuffs for the animals.
Over the winter periods the animals are housed and kept off the land, the quality of the foodstuff that you ration to the animals is most important.
Dry matter digestibility determines the quality of silage, pulp nuts, bean meal, etc, that would be fed to them.
In the winter, the DMD value of the feed will indicate how much has to be fed to each beast on a daily basis.
The DMD value is tested by government laboratories for the Department Of Agriculture on behalf of the farming community, but it is also necessary for the manufacturer of animal feed to test also for quality and pricing purposes.
This DMD value was traditionally done by drying to constant weight in a 100C oven, but this is very time consuming.
Metrohm offers an instrument that it says can analyse a product inside five minutes via a Karl Fischer titrator.
The 841 KF titrator can analyse moisture levels from 100ppm to 100% and can therefore determine DMD values at any level.
The result is automatically calculated through the user friendly touch screen keypad.
Samples of any kind can be introduced as the built in homogeniser will break up any matrix releasing the full moisture content to be analysed.
The results can be printed off or can be stored on a database or transferred to a Lims system if necessary.
If several samples are to be tested a sample changer can be connected which will reduced user time at the workbench.
Ion chromatography for SDS detection.
Sodium dodecyl sulphate is a detergent that is used both in industry and also in personal care products such as shampoo, toothpaste, facial cleansers etc We use products every day that contain SDS, however a recent study has shown that SDS can penetrate the body tissues it comes in contact with and can be retained.
It is linked with catarcts in the eyes of adults, can cause hair loss by removing the natural fats on the skin of the scalp which are necessary to maintain the moisture level in hair follicles.
Another major concern is the connection of SDS with nitrates for nitrosamines which are carcinogenic.
Metrohm can analyse SDS to low ppm levels in water, thus allowing us to monitor the levels of SDS being absorbed by our bodies.
SDS can be detected using direct conductivity measurement using a Metrosep 120-5-C18AQ column and a dilute phosphate eluent.
Typical elution time for SDS is five minutes; the system is run using IC Net 2X software which is fully CFR 21-11 compliant.
The system can also run using IC Cap which makes it easy to use for operators and lab users alike.
Because of the low limits of detection the Metrohm 761 IC can also be used in clean downs in the pharmaceutical industry where the blending room are totally washed down and then tested for residual surfactant before a new blend takes place. Request a free brochure from Metrohm UK ...
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