Hi
I want to know which are the best solvents to prepare oil samples to determinate metals by absorption spectroscopy.
Thanks

One of the best solvent is "xylene".

But, I want to know why we use de xilene.

quote:

Originally posted by KRISHNAKUMAR MENON:
One of the best solvent is "xylene".

But, why we use xilene?

Long, long ago we used to use MIBK (methyl isobutyl ketone). It was a good solvent and good dispersant.

hi,
I would like to know that from wher san i get oil analysis training or crash course. anywhere in India.if someone know about that please let me know that soon..
Thank you..

I like Isopar M (odor free kerosene), which is basically a synthetic isoparaffin material. It is low volatility so it doesn't affect the ICP by loading it up with solvent vapor. Also the low odor is a benefit to everyone else working in the lab. The solvency is not great, but seems to work for most oils (except for some high viscosity complex esters).

In case of ICP you can't run MIBK - puts out torch. Kerosene is about the only organic solvent that works well. We used MIBK on AA due to its solvency. DCP-a direct current plasma - could run about any solvent that you wanted and had better particle efficiency than ICP or AA but needed to be restandardized about every 10 samples so lost favor to ICP
Most important thing is that the viscosity of your diluted samples and standard are close (nebulizer aspiration rate based on fluid viscosity) In MIBK it was 1:4 dilution and in kerosene 1:9 dilution to get Conostan hydrocarbon standards and aircraft engine oils (13 cs ester) to read same. Other approach is peristaltic pump to control aspiration rate - MIBK attacked tubing after a few hours - used kerosene