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目 录 1.前言.....................................................................................................................................2 内容来自www.paper51.com 2.仪器及试剂...........................................................................................................................3 paper51.com 2.1实验仪器........................................................................................................................3 内容来自www.paper51.com 2.2 实验药品及试剂配制...................................................................................................3 http://www.paper51.com
3.复混肥中各形态氮的鉴定…...............................................................................................3 copyright paper51.com 3.1硝态氮的鉴定……........................................................................................................4 内容来自论文无忧网 www.paper51.com
3.2尿素态氮的鉴定............................................................................................................4 copyright paper51.com 3.3有机态氮的鉴定............................................................................................................4 内容来自www.paper51.com
3.4氨态氮的鉴定................................................................................................................4 paper51.com 4.总氮的测定...........................................................................................................................4 内容来自论文无忧网 www.paper51.com 4.1测定原理.........................................................................................................................5 copyright paper51.com
4.2主要反应方式.................................................................................................................5 内容来自www.paper51.com 4.3测定步骤….……….………………..............................................................................5 内容来自论文无忧网 www.paper51.com 4.3.1 样品消煮处理………………………………………………………………………5 内容来自www.paper51.com 4.3.2 蒸馏和滴定................................................................................................................5 内容来自www.paper51.com 4.3.3肥料中总氮含量的计算.............................................................................................6 copyright paper51.com 5.氨态氮和硝态氮的测定.......................................................................................................7 copyright paper51.com
5.1 1号样品中氨态氮的测定..........................................................................................7 paper51.com 5.1.1氨态氮测定原理…………………………………………………………………….7 copyright paper51.com 5.1.2氨态氮的测定步骤………………………………………………………………….8 内容来自www.paper51.com 5.1.3肥料中氨态氮的计算和结果……………………………………………………….8 copyright paper51.com 5.2 1号样品中硝态氮的测定…………………………………………………………..9 内容来自www.paper51.com 5.2.1硝态氮的测定原理.....................................................................................................9 copyright paper51.com 5.2.2硝态氮的测定步骤.....................................................................................................9 copyright paper51.com
5.2.3肥料中硝态氮的计算和数据处理…………………………………………………11 http://www.paper51.com 6.硫酸铵的回收率测定试验……………………………………………………………….11 copyright paper51.com
7.结果分析及讨论.................................................................................................................12 paper51.com 7.1总氮测定结果的分析...............................................................................................12 内容来自www.paper51.com 7.2硝态氮和氨态氮含量之和与总氮含量关系的分析与讨论....................................12 copyright paper51.com 7.3回收率测定实验的分析与讨论................................................................................13 copyright paper51.com
7.4凯氏定氮仪测定肥料中总氮的优点分析................................................................13 内容来自www.paper51.com 7.5不同形态氮鉴定必要性的分析讨论........................................................................13 内容来自论文无忧网 www.paper51.com 7.6空白实验的重要性分析...........................................................................................14 内容来自论文无忧网 www.paper51.com 7.7蒸馏时保持蒸馏管内碱性环境的分析与讨论........................................................14 内容来自www.paper51.com 7.8实验收获....................................................................................................................14 copyright paper51.com
8. 结语...................................................................................................................................15 http://www.paper51.com 致谢........................................................................................................................................15 paper51.com 参考文献…............................................................................................................................16 内容来自www.paper51.com |