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稳定性核素~(15)N是研究土壤肥力变化、肥料利用状况、作物营养生理、生物固氮等不可缺少的元素。近年来随着科学技术的迅速发展,对~(15)N的测试手段也提出了更高的要求,由原来只限于质谱分析法发展为发射光谱分析法。光谱分析与质谱分析比较,具有造价低廉、操作简便、灵敏度高、抽真空时间短、样品状态多样化等特点。目前,国外应用较多的~(15)N分析仪有两大类型:一是东德生产的NOI—4型、NOI—5型等,二是日本生产的NAI—1型、N
The stability of radionuclide ~ (15) N is an indispensable element to study the changes of soil fertility, fertilizer use status, crop nutrition physiology and biological nitrogen fixation. In recent years, with the rapid development of science and technology, higher requirements have also been put forward for the test method of ~ (15) N, which was originally limited to the development of emission spectrometry by mass spectrometry. Spectral analysis and mass spectrometry analysis, with low cost, easy to operate, high sensitivity, vacuum pumping time is short, the status of diverse samples and so on. At present, there are two types of ~ (15) N analyzers with more applications abroad: one is the NOI-4 type and the NOI-5 type produced in East Germany; the other is the NAI-1 type produced in Japan; the N