[" Kjeldahl method of estimating nitrogen is not "],[" applicable to "]

Kjeldahl method for estimation of nitrogen is not applicable to

In Kjeldahl's method of estimation of nitrogen, nitrogen is quantitatively converted to ammonium sulphate. It is then treated with standard solution of alkli. The nitrogen which is present is estimated as

In Kjeldahl's method of estimation of nitrogen, K_2SO_4 acts as:

In kjeldahl's method of estimation of nitrogen, copper sulphate acts as :

In the first step Kjeldahl method for estimation of nitrogen in organic compounds , nitrogen is converted into -