Dear all members

In my reaserch I want to measure the amounts of humic and fulvic acids in soil but I faced to a problem.I have extracted and fractionated them by means of NaOH and changes in pH but I can not measure the amount of fulvic and humic acid  in final solution with low pH (fulvic acid) and precipitated materials (humic acid) because I do not access to necessary tools and I am seeking for a simple presedure.Is it a true method to measure by drying and weighting final solution and precipitated materials.
I shall be greatful if you will help me with your advices and comments. 

Regards

Hossein Karimi
Department of Soil Science
Agricultural College,Ferdowsi University,Mashhad,IRAN
P.O.Box   91775-1163
E-Mail   http://skarimi343@yahoo.com