Dear all, 

I am analyzing SOIL NC in EA and I need at least 75ugN in the sample to get a 
good linearity. With this amount of N I need, I need to weigh up to 200 mg of 
finely ground sample due to low %N in the sample. Please help me on how to 
know if I have a good combustion of the sample. Is there a specific 
combustion catalyst for plant or soil combustion?

Many thanks for your help.


Ruben G. Chavez
Officer
Analytical Service Laboratories
Mail: DAPO Box 7777, Metro Manila, Philippines
Tel: +63(2) 580-5600 ext. 2419
Fax: +63(2) 580-5699
Web: www.irri.org