App for CHN Elemental Analysis Calculator for solvent and impurity corrections
http://www.aziny.com/apps/chn/
Elemental Composition Calculator:
http://scs.illinois.edu/microanalysis/calc/
Elemental Analysis Calculator
http://fluorine.ch.man.ac.uk/research/analyse.php
CHN Calculator with Solvent Correction:
http://internal.eps.hw.ac.uk/services/analytical/chn-calc-solvent.htm