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土壤全氮全磷含量的测定是土壤重要的常规分析项目,它是研究土壤基本特性以及土壤肥力性质的重要指标。按常规法,过去这二个项目是分别消化测定的,比较费时费事,如能在一个消化液中连续测定此二个项目,无疑可大大节省人力、物力和时间。 全氮的消化都采用经典的开氏法(除干烧法外),对大多数土壤中氮的分解率可达98～99％,常加的提温剂、接触剂、氧化剂有:CuSO_3、K_2SO_4、N_2SO_4、Se、Hg、K_2Cr_2O_7、KMnO_4、HClO_4、H_2O_2等。全磷的消化经典法是Na_2CO_3熔融法;NaOH熔融法,其分解率可达100％,但设备昂贵,手续繁杂。近年多用HClO_4、H_2SO_4-HClO_4法,分解率也可达97～99％,除红壤类土壤外,大都用HClO_4及H_2SO_4-HClO_4法。另外还有H_2SO_4—HNO_3法、H_2SO_4法(即开氏法)、HNO_3—王水法、Mg(NO_3)2王水法、
Determination of soil total nitrogen and phosphorus content is an important routine analysis of soil, which is an important indicator of the basic characteristics of soil and soil fertility properties. According to the conventional method, the past two projects were separately digested and time-consuming. If these two projects can be measured continuously in a digestive juice, it will undoubtedly save manpower, material resources and time. Total nitrogen digestion using the classic method of Kaiser (except for the dry method), most of the decomposition of nitrogen in soil up to 98 to 99%, often plus the temperature, contact, oxidants are: CuSO_3, K_2SO_4, N_2SO_4, Se, Hg, K_2Cr_2O_7, KMnO_4, HClO_4, H_2O_2 and so on. The classical method of total phosphorus digestion is Na_2CO_3 melting method; NaOH melting method, the decomposition rate of up to 100%, but the equipment is expensive, complicated procedures. In recent years, more use of HClO_4, H_2SO_4-HClO_4 method, the decomposition rate of up to 97 ~ 99%, in addition to the red soil soil, mostly with HClO_4 and H_2SO_4-HClO_4 method. There are also H_2SO_4-HNO_3 method, H_2SO_4 method (ie, Kelvin method), HNO_3-aqua regia method, Mg (NO_3) 2 aqua regia method,