Biofuel Industry News

  • Monitoring Copper  in Fuel Ethanol by Anodic Stripping Voltammetry

Monitoring Copper in Fuel Ethanol by Anodic Stripping Voltammetry

Aug 06 2009 Read 1841 Times

The presence of copper in fuel ethanol blends negatively affects engine performance. Thus, the US ASTM D 4806 and the European EN 15376 both restrict the amount of copper in fuel ethanol to 10 µg/L. Anodic stripping voltammetry (ASV) is the determination method of choice, as it allows the quantification of Cu(II) without any sample pretreatment.

The presence of heavy metal traces in car fuels adversely affects engine performance. Copper, for example, is a very active catalyst for the low-temperature oxidation of hydrocarbons. Consequently, copper concentrations above 12 µg/kg in commercial gasoline are expected to promote the deterioration of olefins and the formation of gum.
 
In order to monitor heavy metal traces, anodic stripping voltammetry (ASV) is the method of choice. ASV is a sensitive and selective electroanalytical technique comprising two steps. Firstly; metal ions are electrodeposited on the mercury electrode, which is held at a suitable potential. Then the (amalgamated) metal deposits are anodically stripped from the mercury electrode by scanning the potential.
 
The ASV is performed using the hanging mercury drop electrode (HMDE) and the Metrohm’s  (Switzerland) 797 VA Computrace for trace analysis. The HMDE is used with a platinum auxiliary electrode and an Ag/AgCI reference electrode using saturated lithium chloride in ethanol as the inner electrolyte. The concentration of the copper in the samples is quantified by standard addition.

 

Reader comments

Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.

Post a Comment





Digital Edition

Petro Industry News September 2020

September 2020

In This Edition Fuel For Thought - DKSH extends partnership with Bruker in China - Will insurers mandate digital ecosystems for energy assets by 2025? - XOS heads to Mars Analytical Inst...

View all digital editions

Events

Chemistry. Oil & Gas

Sep 29 2020 Minsk, Belarus

OIL Expo

Sep 29 2020 Sosnowiec, Poland

International Energy Week - POSTPONED

Oct 06 2020 Kuching, Malaysia

10th St Petersburg International Gas Forum

Oct 06 2020 St. Petersburg, Russia

Kuwait Oil & Gas Conference & Exhibition

Oct 06 2020 Kuwait City, Kuwait

View all events