|
|
凯氏定氮仪测定土壤全氮方法优化
|
Abstract:
土壤样品在加速剂的参与下，用浓硫酸消煮时，各种含氮有机化合物，经过复杂的高温分解反应，转化为铵态氮。碱化后蒸馏出来的氨用硼酸吸收，以酸标准溶液滴定，求出土壤全氮含量。通过方法优化是解决了人工滴定存在的人为误差、消解完全、操作简单、污染小。
When soil samples are cooked in concentrated sulfuric acid with the help of accelerant, various nitrogen-containing organic compounds undergo a complex decomposition reaction at high tem-perature to convert into ammonium nitrogen. The ammonia distilled after alkalization was ab-sorbed by HBO4, and the total nitrogen content in soil was determined by titration with acid standard solution. By means of method optimization, the artificial error, complete digestion, simple operation and less pollution in manual titration are solved.
| [1] | 张琳, 邹国元, 李新慧. 测定土壤全氮两种消煮法的比较[J]. 北京农业科学, 1997, 15(3): 38-39. |
| [2] | 陈淑萍, 等. 几种凯氏氮加速剂对植物全氮消煮时间和结果的比较分析[J]. 华北农学报, 2006, 21(增刊): 19-22. |
| [3] | 杨义法. 刍议提高土壤全氮测定的准确度[J]. 现代农业科技, 2007(10): 129. |
| [4] | 周敏, 李欣红. 开氏消煮-常量蒸馏-纳氏试剂光度法测定土壤中的全氮量[J]. 现代科学仪器, 2004(1): 26-27. |
| [5] | 张崇玉, 李生秀. 凯氏全氮与固定态铵之间的关系[J]. 中国农业科学, 2004, 37(12): 1879-1885. |
| [6] | 王卫东, 廖少琳. 两种测定植株全氮样品消化方法的比较[J]. 四川林业科技, 1996, 18(1): 46-48. |
| [7] | 陈宝三, 黄春兰, 张丽华. 土壤全氮测定中消化方法对分析结果的影响[J]. 宁夏农林科技, 1997(3): 30-31. |
