Tellurium as catalyst in
semimicro Kjeldahl method for total nitrogen determination.
O nitrogenio (N total) foi determinado pelo metodo
semimicro Kjeldahl; o fosforo por espectrometria com amarelo de vanadato; o potassio por fotometria de emissao de chamas, seguindo os metodos preconizados pela Embrapa (2009).
Asi, en funcion de la escala del problema espacial tratado, el 76% de los articulos responden a aspectos de macroescala (n=10 articulos), un 16% acerca de micro y
semimicro (n=2) y, un unico caso (8%) donde el SIG se implemento sobre una coleccion de objetos materiales en los que se analizan unidades espaciales correspondientes a diferentes tipos de elementos oseos.
A new simple
semimicro method for colorimetric determination of urea.
Updegraff, "
Semimicro determination of cellulose in biological materials," Analytical Biochemistry, vol.
The
semimicro kit handling samples from 25 to 200 mg was used because of the small amounts of the studied compounds.
Nitrogen was quantified by the Kjeldahl
semimicro method; phosphorus by the spectrometry method with vanadium yellow; potassium and sodium using the method of emission flame spectrometry; calcium, magnesium, iron, zinc, copper, and manganese by the spectrometry method of atomic absorption; sulfur by the turbidimetry method; and boron by the azimetric method (EMBRAPA, 2009).
Total nitrogen, or crude protein, was obtained through the Kjeldahl
semimicro method (AOAC, 2005), where fat-free samples were used and 6.25 factor in the calculation of conversion of nitrogen into protein.
The method is based on recording the stiffness of the sediment by using a penetration standard needle connected to a digital
semimicro balance (Mettler AE163, Switzerland) with a precision of 0.1mg(9.8 x [10.sup.-4] mN weight).
(2009)
Semimicro e lec tro de Tang (2015) Bilateral Rothlind (2015) Bilateral Houvenaghel (2015) Bilateral Tramontana (2015) Bilateral Verb fluency-phoenemic Takehiko-Yamanaka (2012) Monopolar Merolaetal., (2011) -- Daniels etal., 2010 Castelli et al., [54] Monopolar bilateral Le Jeune et al.
Favreau, "A new simple
semimicro method for colorimetric determination of urea," Clinical Chemistry, vol.