nitrogen isotope

Method of measurement of nitrogen isotope ratio in natural gas

天然气中氮同位素组成的测定

Ammonium Content and Nitrogen Isotope Constraint on Metallogenetic and Diagenetic Environment

铵含量和氮同位素对成岩成矿环境的示踪

Measurement and Analysis of Stable Carbon and Nitrogen Isotope of Amino Acids in Wheat Grain

小麦籽粒氨基酸碳氮稳定同位素的测定与分析

Carbon and Nitrogen Isotope Geochemistry of Karst Groundwater in City

喀斯特城市地下水C、N同位素地球化学

Influence of Artificial Food on Stable Carbon and Nitrogen Isotope Composition of Plateau Pikas

人工食物对高原鼠兔稳定性碳和氮同位素组成的影响

Effects of Maize Contents in Ration on Stable Carbon and Nitrogen Isotope Composition of Broilers

日粮中玉米含量对肉鸡碳·氮同位素组成的影响

Study on trophic level of main fishes in the Leizhou Bay with stable nitrogen isotope techniques

应用氮稳定同位素技术对雷州湾海域主要鱼类营养级的研究

Seasonal variability of stable carbon and nitrogen isotope of suspended particulate matter in the Changjiang River

长江悬浮颗粒物中稳定碳、氮同位素的季节分布

Element analysis isotope mass spectrometry technology was applied to determine nitrogen isotope composition of sample from environmental and geological fields .

建立了使用元素分析仪-同位素质谱（EA-MS）联用技术测定土壤样品氮同位素比值的方法。

Applications of nitrogen isotope techniques : The prerequisite analysis of soil organic nitrogen as sources of nitrate contamination of groundwater

氮同位素技术的应用：土壤有机氮作为地下水硝酸盐污染源的条件分析

Nitrogen isotope studies on seasonal nitrogen pollution of inflowing rivers of Hongfeng lake , Guizhou Province

氮同位素示踪贵州红枫湖河流季节性氮污染

Study on the Variability of Nitrogen Isotope in the Yangtze River ( Changjiang ) Estuary , China and Its Environmental Implications

长江口海域氮的同位素特征及其环境意义

The isotope tracer method presents the advanced method of carbon isotope , nitrogen isotope , oxygen isotope and Pb tracer .

同位素示踪法着重阐述了较先进的碳、氮、氧和铅同位素的示踪。

As an effective tracing method , stable nitrogen isotope is significant for studying the nitrogen cycling , especially for identifying source of nitrogen pollution .

稳定氮同位素作为一种有效的示踪手段，在研究氮循环特别是污染氮源的识别方面有重要意义。

The origin of suspended particulate matter and surface sediment organic matter were identified , based on values of stable carbon and nitrogen isotope , as well as the correlations between them .

通过上述研究，对水体鄱阳湖悬浮颗粒物和沉积物有机质碳、氮同位素分布特征、有机质来源及它们之间的相关性有了初步的认识。

Based on the analysis of stable nitrogen isotope (δ 15N ), variability of nitrogen isotope in the Yangtze River ( Changjiang ) estuary and its environmental implications were studied .

本论文以稳定氮同位素（δ15N）技术为基础，对长江口海域氮的同位素特征及其环境意义进行了研究。

Compared with the combustion method , the bacterial denitrification method can analyze nitrogen isotope of nitrate in trace amounts of water samples with lower concentration , and is hence more rapid , convenient and reliable .

与传统方法相比，细菌反硝化法可分析低浓度微量水中硝酸盐氮同位素，且更为快捷可靠。

Nitrogen isotope geochemistry in minerals and rocks has not been fully studied , primarily because of very lower ( < 1000 ppm ) concentration of nitrogen in the crustal rocks and the difficulty to extract nitrogen from silicate minerals and rocks .

氮同位素地球化学在固体地球科学研究很少被关注，主要是由于在地壳岩石中氮丰度很低（<1000ppm）和氮难于从硅酸盐中提取出来。

Carbon and nitrogen stable isotope are used as indicators of nutrient changes .

利用C、N同位素组成的变化指示水体中营养状况的变化。

The orthodox methods such as liquid nitrogen , isotope application , injection of sclerosing agent could result in scar , hypopigmentation and tissue necrosis .

但传统的治疗方法如冷冻、同位素及硬化剂注射等易继发局部疤痕形成，色素减退，局部组织坏死等，实际临床受限。

But for the intrusive rocks , the nitrogen content and isotope compositions better reflect the content and isotope compositions of nitrogen-bearing matter in the crust .

而侵入岩中的N2含量和氮同位素组成更多地反映了地壳中含氮物质浓度及同位素组成特征。

Microbial effect on nitrogen cycle and nitrogen isotope fractionation on the earth 's surface & a review

地表环境氮循环过程中微生物作用及同位素分馏研究综述

The absorption , utilization and distribution of different sources of nitrogen in tabacco with isotope tracer were studied .

本文根据~（15）N示踪技术对烟草吸收不同来源氮素后分配利用的研究，分析了烟草氮素营养的特征。

We have carried on organic carbon content , total nitrogen content , organic carbon stable isotope , organic nitrogen stable isotope , carbonate content , granularity and determination of time and other experimental analysis .

在室内对岩芯进行了预处理后，分别进行了有机碳含量、总氮含量、有机碳、氮稳定同位素、碳酸盐含量等指标的实验分析。

Higher nicotine content of upper leaf results lower usability of tobacco leaf in industry , for this problem , we designed field experiments of different nitrogen fertilizer levels , mineralization experiment of organic nitrogen , isotope label experiments and investigated agricultural practice of peasants .

针对烤烟上部叶烟碱含量过高，导致工业可用性下降的问题，设置了大田不同施氮量试验、土壤有机氮矿化试验、同位素示踪试验，烟农生产情况调查。

The potential of nitrogen fixing of plants was evaluated by using the variation of nitrogen isotope component in leaves and stems of plants and in soil .

利用森林生态系统中植物茎叶与土壤氮的氮同位素组成（~（15）N天然丰度值）的变化评估植物固氮能力，为野生固氮植物资源调查提供一种简便易行的测试方法。