00332nam a2200097Ia 4500008004100000082002500041100000800066245012900074260002500203300000600228140113s9999    xx            000 0 und d  a633/639:543.846   L5  aISO  aISO : 1871(1975) : Agricultural Food Products : general directions for the determination of nitrogen by the Kjeldahl method.  a1975bISOcNew Delhi  a5