| 摘要: |
| 研究了用AA3型连续流动分析仪测定土壤和植物全氮的方法。结果表明，根据待测溶液中硫酸浓度调节缓冲溶液中NaOH的鲼，保持反应pH在适宜范围，利用连续流动分析仪能够准确地测定土壤和植物中的全氮含量，与蒸馏滴定法的测定结果相比无显著差异，标准曲线相关系数达0.999以上，平均回收率为97.8％～102.3％，土壤和植物待测液中NH+4-N含量的检出限分别为0.033 7和0.016 5 mg/L。 |
| 关键词: 连续流动分析仪(CFA) 植物全氮 土壤全氮 测定方法 |
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| 基金项目:国家自然科学基金重点项目“西北旱地作物高产优质高效栽培生理生态研究”（30230230） |
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| Determination study of total nitrogen in soil and plant by continuous flow analytical system |
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| Abstract: |
| Determination method of total nitrogen in soil and plant by AA3 Continuous Flow Analytical System was investigated.The results show that,the amount of sodium hydroxide in buffer solution can be adjusted according to the sulfuric acid concentration in the sample solution,and the reaction would occur in an adequate pH range.A3 CFA can be used to assay total nitrogen in soil and plant accurately.The correlation efficiency for the standard series is as high as over 0.999,and the average recovery percentage is 97.8%-102.3%.The N detection limit of analytical solution of soil and plant are 0.033 7 and 0.016 5 mg/L respectively. |
| Key words: Continuous Flow Analytical System(CFA),total nitrogen in plant,total nitrogen in soil,determination method |
