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svoc mix
Posted: Thu Jan 26, 2012 6:29 pm
by organicchem
Hi Everyone
I have purchased accustandard 8270 svoc mix dissolved is 75:25 (metheylene chloride : benzene). I want to make secondary stand by diluting this mix. For diluting which solvent is best either hexane or methylene chloride. pls. assist
regards
Re: svoc mix
Posted: Fri Jan 27, 2012 10:14 am
by Johnny Rod
I would ssay this depends entirely on whicih of the two will obliterate any parts of the chromatogram. As you are aleady in 75% methylene chloride you might as well use more. NB check your blank injections, this stuff often has a few impurity peaks in it striaght from the bottle.
Re: svoc mix
Posted: Mon Jan 30, 2012 2:50 pm
by AICMM
organicchem,
I would suggest you look at what your samples are going to end up in. If you are doing environmental and using DCM and will KD your samples down to 1 mL in DCM, then I would dilute your standard in DCM.
Best regards,
AICMM
Re: svoc mix
Posted: Tue Jan 31, 2012 9:09 am
by Alexandre
There is no issue with solubility as your next dilution will be at least 10 folds.
For env. samples we used pure DCM.
Consider the Certan vials (Supelco) too.