WEF Discussion Forums : Laboratory Management and Technical Issues : TDS/VDS LCS I need an LCS for TDS/VDS.  I am using NaCl, but need another compound to combine with it that will hold at 180 degrees but then volatilize at 550 degrees.  Any suggestions? 


]]> Thu, 04 Mar 2010 16:49:46 GMT

Potassium hydrogen phthalate (KHP) should work, Jami.  Being very soluble in water, a 300 mg/L solution of KHP should give a TDS of 300 mg/L.  A study by the joint EPA Region 1/WA State Dept of Ecology lab found the same 300 mg/L solution gave an average total volatile solids of 169 mg/L.

 

If you decide to try KHP, be aware that it is hygroscopic...dry it at 105°C, store it in a desiccator, and weigh it immediately after removing from the desiccator.


]]> Thu, 04 Mar 2010 21:12:52 GMT

Thanks Perry!  I'm giving it a try today.  Looking forward to the results... your help is very much appreciated.



]]> Thu, 18 Mar 2010 13:59:33 GMT ]]> Sun, 26 Jun 2011 17:37:28 GMT ]]> Sun, 26 Jun 2011 01:19:37 GMT ]]> Mon, 27 Jun 2011 18:15:35 GMT Good point. I hadn't tghohut about it quite that way.
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