Product category:
Materials Testing
News Release from: Metrohm UK | Subject: 774 Oven Sample Processor
Edited by the Manufacturingtalk Editorial
Team on 21 September 2006
Analysis of shampoo and conditioners
Using the 774 Oven Sample Processor in conjunction with the 831 KF Coulometer for shampoo, analysis times are typically 3 - 5 minutes and RSD's on results are less than 1%
People expect a lot from shampoos and conditioners Unfortunately, it is not easy to tell a good shampoo from a poor one
This article was originally published on Manufacturingtalk on 7 Jul 2004 at 8.00am (UK)
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If There Is Moisture In It We Will Find It!
A "New" Oven for Each Sample Water determination using the 774 Oven Sample Processor is quick, simple and let's you save alot of time and money.
Process chemicals can be analysed on-line
Metrohm has combined the best aspects of laboratory and online systems to produce the 875 ProcessLab: a fully customised, automated at-line system for analytical testing.
Cost, fragrance, and lots of foam is what most people look for in shampoo products.
Lather and foam is of little importance, but they often get the most attention.
Foaming occurs when surfactant molecules gather around air instead of oil.
Further reading
Determining water levels in lubricating oils
It is impoirtant to determine the presence of water in machinery lubricating oils, which is why Metrohm is offering its 831 KF Coulometer to give reliable results over a long period.
Metrohm electrodes - free storage DVD offered
Metrohm UK advised that companies ordering a new Metrohm electrode now will receive a free storage and maintenance DVD - offer expires on March 31, 2008.
Analysing electroless nickel plating baths
Automated on-line analysis system performs all liquid handling steps such as taking sample aliquots, dosing of reagents, titration and cleaning.
The result is millions of tiny bubbles.
Obviously, the air bubbles are using the surfactants that should be removing dirt and oil.
We have all seen shampoo advertisements showing happy, beautiful people taking showers with their heads heaped high with mounds of lather.
These images have taught the public to associate lather with cleansing ability.
The truth is, lots of foamy lather only means too much shampoo was used.
Excess foam equals waste.
Sebum and other oils quickly destroy foam.
Ideally, the head should have just enough lather to lubricate the scalp and hair.
This will help your fingers massage the shampoo more effectively into the hair.
Fragrances and foaming qualities are not good ways to evaluate shampoos and conditioners.
A good way to evaluate the moisturizing performance of the shampoo and conditioners is to determine the water content of the hair before and after treatment with the relevant product.
A sample of hair is taken from the head prior to treatment.
The hair is then washed with the shampoo/conditioner, dried and a further sample is cut from the hair.
Fairly large samples of hair were taken.
Historically the analysis of water in hair was not only time consuming but very inaccurate.
The sample was typically digested with hot acid and then added to a solvent (typically methanol).
This sample solution was then injected into a volumetric Karl Fischer instrument where the moisture content was determined.
At every step errors were introduced and subsequently poor relative standard deviations were achieved on the results.
However, with a unique technique developed by Metrohm, analysis times are shorter and the reproducibility of results is significantly better.
Using the 774 Oven Sample Processor in conjunction with the 831 KF Coulometer analysis times are typically 3 - 5 minutes and RSD's on results are less than 1%, and more importantly for the hair donor, sample sizes are tiny!! The hair is weighed into a vial and the top is sealed (crimped).
This sample is then introduced into an oven where the water evolved is titrated in the KF coulometric cell.
The refined methodology of the 774 OSP brings decisive advantages; .
Strictly reproducible analysis conditions for all samples, this is shown by the considerably improved precision of the results.
Manual sample preparation is reduced to a minimum, just "weigh, crimp and analyse".
Considerable savings in time and money, less reagent costs for example, no more acid and solvent extraction.
No contamination of the oven, consequently there is no carryover and memory effects.
Improved water release from the sample as the carrier gas does not just pass over the sample but directly through it.
Fast analysis times; typically 3 minutes, and up to 35 samples at a time!! We also have applications where the bound and unbound moisture can be determined separately. Request a free brochure from Metrohm UK ...
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