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