By Harvey G on Thursday, September 12, 2002 - 08:46 pm:
Has anyone any ideas concerning the separation of sodium carboxymethyl cellulose form laundry detergent powders by LC?
By Harvey G. on Thursday, September 12, 2002 - 08:53 pm:
Sorry, original message posted without my e-mail address.
By Anonymous on Friday, September 13, 2002 - 01:31 pm:
Are you trying to quantitate the CMC or remove it to quantitate other materials? My company does a lot of CMC analysis and we use FIA (flow injection analysis).
By Harvey G. on Tuesday, September 17, 2002 - 07:17 pm:
I am in need of a method, LC or otherwise for determining concentration of CMC in laundry detergent powder products.
By Anonymous on Friday, September 20, 2002 - 10:13 am:
I have a method that for flow injection analysis that ion pairs CMC with PHMB. It uses a flourimeter. If you are interested I can fax it to you. It was designed for solutions of 0.4 - 0.6% w/v.
By Harvey G. on Sunday, September 22, 2002 - 08:06 am:
To anonymous. Your response interests me.
I have not run into the term Flow Injection Analysis before. If it is an LC technique, I am wondering if it is not what we refer to as Post Column Injection.
If it is not an LC method, might it be a technique similar to an Autoanalyzer where chemicals are pumped at a constant rate and mixed together before samples are injected into the stream.
With autoanalyzers and HPLC, I have used UV detectors. I have also used, refractive index and evaporative light scattering detectors with HPLC and conductivity detectors with HPIC.
I have not run into a flourimeter detector method for either. I assume it detects specific wavelengths of light fluoresced or emitted from analytes bombarded by some form of radiation such as UV or X-ray, like an XRF spectrophotometer.
I would like a few more details. I am always interested in learning new techniques and instrumentation. Part of my job is to suggest purchasing analytical equipment, learning to use it, developing methods for application in both our plant Q.C. and our Q.A. analytical laboratories, preparing manuals, writting methods, training plant operators and lab technicians to use and maintain the equipment.
I am a 60 year old lab man, with 41 years experience playing with my old lab toys, who is always interested in learning to play with new ones. Can you please provide more info. You can contact me directly by e-mail. All you have to do is click on my name found at the beginning of this message.