DIN 38409-28:1992 德国对水.废水和淤泥的统一检验方法.作用参数和物质参数(H组).经达瓦德(Devarda)合金还原和催化分解后测定结合氮
German standard methods for the examination of water, waste water and sludge; parameters characterizing effects and substances (group H); determination of bound nitrogen after reduction with Devarda's alloy and catalytic digestion (H 28)