and if it is possible with HPLC then kindly provide standard monograph
Hi sir, I'm not so sure for SDBS but there's a cost saving method you might can try. You can ash crystal in a furnace and dissolve residue in water, addition of barium salt will precipitate sulphate as barium sulphate. Filter the precipitate and weight conversion will give you the purity of SDBS.
I've done it with SLS, but I never tried with SDBS. Just a recommendation for you as a more cost saving method.
It depends what purity you want to check and what accuracy is required. With an ashing method in the presence of H2SO4 the amount of sodium can be determined gravimetrically. If you want to check the alkylchain distribution (presence of C11, C13, C14-benzylsulfonates etc), and therefore the molecular weight (distribution) of the product I would recommend an electrospray mass spec (ESI-MS) measurement in the negative ion mode.
You may have a look at ASTM D3712, Standard Test Method of Analysis of Oil-Soluble Petroleum Sulfonates by Liquid Chromatography. This ASTM also describes a sulfate ashing method for alkylbenzene sulfonates.
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