Dear all,

I 'm so concerned, as we have often the same problem with some sediment 
wich are very poor in N (0.02%), so I'm really interesting in the 
answer, as I often doubt that we have a good combustion with 100 or 
200mg sample.


Ruben G. Chavez a écrit :

>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
>
>  
>

-- 
Isabelle Billy
UMR EPOC - 5805 
Département de Géologie et Océanographie
Université de Bordeaux I
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