Follow us...

 

Search News Archives

Channels

News

 

 

View Channel

Laboratory Products

 

 

View Channel

Special Offers and Promotions

 

Microscopy | Image Analysis

 

 

View Channel

Separation Science

 

 

View Channel

Coronavirus (COVID-19)

 

 

View Channel

Research & Case Studies

 

 

View Channel

Conferences | Events

Straightforward direct determination of sodium in food samples

MetrohmSodium is one of the most common inorganic cations in food. It is mostly added as sodium chloride. Common methods of direct testing include atomic absorption spectroscopy or inductively coupled plasma spectroscopy – techniques requiring expensive instrumentation, costly ultrapure reagents and laborious sample preparation. A straightforward, less expensive and fully automated alternative method is thermometric titration. A detailed description of the method can be downloaded from www.metrohm.com

Thermometric titration uses the rate of change in temperature of the titration solution to detect the endpoint. The sodium determination relies on the exothermic precipitation of elpasolite (NaK2AlF6). The titrant is a standard aluminium solution that contains an excess of potassium ions. The required excess of fluoride ions is provided by ammonium bifluoride, which also serves to buffer the solution to an ideal pH 3.

The method is robust, can be fully automated and copes with challenging food matrices such as ketchup, instant soups, gravies and salty snacks. The titration is performed directly on a suspension of the food sample and is complete in under two minutes.

For further information please visit www.metrohm.com


If you have not logged into the website then please enter your details below.



 

Subscribe to any of our newsletters for the latest on new laboratory products, industry news, case studies and much more!

Newsletters from Lab Bulletin

 

Request your free copies HERE

 

 

 

Popular this Month

Top 10 most popular articles this month

 

Today's Picks

 

 


 

Looking for a Supplier?

Search by company or by product

 


Company Name:

Product:


 

 

 

 

Please note Lab Bulletin does not sell, supply any of the products featured on this website. If you have an enquiry, please use the contact form below the article or company profile and we will send your request to the supplier so that they can contact you directly.

Lab Bulletin is published by newleaf marketing communications ltd.


 

Media Partners