一个特定元素的同位素具有相同的化学特征，但在物理性质上有一些细微差异。
The isotopes of a given element have the same chemical properties but slightly different physical properties.
“但是，多年来对地球化学的观察让我知道谨慎是明智的，”他说，“无论是这次对于氯同位素的研究还是早期对于水的研究都需要谨慎。”
"But years of observation of geochemistry have taught me that caution is wise," he says, "whether it be for the earlier claims on water or this latest work on chlorine isotopes."
氡容易离子化，这让人期望，该元素有最广泛的化学反应，但是，这个元素最稳定的同位素也极不稳定，这使氡的研究受到了严重的约束。
Although the easier ionization of radon leads one to expect the most extensive chemistry for that element, the high instability of even the most stable isotope has severely limited studies of it.
同位素是存在于元素的变体，天然存在，同位素与元素具有相同的化学性质，但由于所含的中子数不同而重量不同。
These are naturally occurring variants of elements,which share the same chemical properties but have different weights because their nuclei contain different numbers of neutrons.
证据就存在于海洋泥土，花粉化石和记录温度变化的化学同位素比值变化之中。
The evidence lies in ocean mud, in fossil pollen, and in changes in ratio of chemical isotopes that record shifts in temperature.
同位素是一个特定化学元素的不同原子变种。
Isotopes are different atomic versions of a particular chemical element.
围岩和充填物的碳氧同位素地球化学揭示盐水流体不是来自于围岩自身，极可能来自于烃源岩。
The geochemical characteristics of host rocks and filling minerals reveal that the salt fluid is not from host rocks, but most likely from source rock.
同位素：一种化学元素的两个或多个类型，它们的原子核具有相同的质子数，而中子数却不同。
Isotope: One of two or more species of atoms of a chemical element having nuclei with the same number of protons but different Numbers of neutrons.
自然界锂同位素分馏强烈，这使得它在很多方面都得到了应用，如地球化学、天体化学和核工业等。
The relative large lithium isotopic fractionation in natural samples has useful application in the fields of geochemistry cosmochemistry and nuclear chemistry.
由于氙是惰性的，不易与其他元素产生化学键，因此很容易纯化以进行同位素分析。
Being a noble gas, it resists chemical bonding with other elements and is thus easy to purify for isotopic analysis.
目前，评价土壤中金属植物有效性的方法主要有：化学提取法、植物吸收试验、微生物和酶活性试验及同位素法。
The main methods now to evaluate Pb availability in soil are chemical extraction, plant adsorption, microbial and enzyme activation and isotopes tests.
本文从物理有机化学的角度，从化学反应速度和同位素效应二方面对化学反应中的过渡状态问题进行探讨。
From the Angle of physical organic Chemistry, the transition state of chemical reactions has been studied in chemical reaction rate and isotope effect.
在缺氧环境的研究中，地球化学指标如矿物、微量元素、同位素和有机地球化学指标最为重要。
The geochemical indicators, such as mineral, trace element and isotopic geochemistry and organic geochemistry indices, are of the most importance in the study of anoxic environment.
矿物水体系氢同位素平衡分馏系数和动力分馏系数是同位素地球化学研究中的重要参数。
The hydrogen isotope equilibrium fractionation factors and kinetic fractionation parameters are the important basic data for the study of isotope geochemistry.
在生物化学中，放射性同位素主要有两方面的应用。
There are two main types of USES of radioactive isotopes in biochemistry.
惰性气体同位素地球化学是研究地幔脱气作用和地球大气形成与演化的有效工具。
Noble gas isotopic geochemistry is a useful tool for studying on mantle degassing and evolution of the Earth's atmosphere.
同位素有相同的化学特性，但是原子属性不同。
Isotopes have the same chemical identity but different nuclear properties.
概述了钙同位素分馏机理、分析测定以及在环境地球化学研究中的应用。
Fractionation mechanism, analytical method and its applications in environmental geochemistry of calcium isotopes are summarized in this paper.
随着现代分析测试技术的提高，碳同位素在油气地球化学中的应用也越来越广泛。
With the development in modern testing and analyzing techniques, carbon isotopes have been used widely in oil and gas geochemistry.
放射性同位素以各种化学形态作为示踪剂的应用为医学提供了强有力的诊断工具。
In medicine, the use of radioisotopes in various chemical forms for tracing purposes offers a powerful diagnostic tool.
本文通过对典型热泉的地质背景、环境条件、水化学及碳、氦稳定同位素的分析，探讨了我国云南省深大断裂出露温泉CO_2释放的一般规律。
This paper discussed the rule of CO_2 degassing from deep faults hotsprings in Yunnan by analysis of the geology background, environment condition, chemistry of water and carbon, helium isotope.
老湾花岗岩的岩石化学、稀土元素和同位素特征指示出老湾花岗岩源于下地壳经部分熔融作用形成。
The lithochemistry, REE and isotope characteristic of strontium, oxygen and lead of Laowan granite show that the granite originates from lower crust by partial melting.
利用锶同位素地球化学行为、地球化学特征及这些特征在沉积环境方面的指示意义，分析了东濮凹陷下第三系盐湖沉积的锶同位素特征。
With indicating significance of geochemical characteristics of Sr isotope in sedimentary environment, characteristics of Sr isotope in Eogene saline deposits in Dongpu depression have been studied.
利用水化学、同位素调查的方法，对宁南清水河平原地下水的水化学演化规律进行了研究。
The hydrochemical and isotope charateristics of groundwater in Qingshuihe plain was studied by the methods of hydrochemical and isotope investigation.
文章在充分了解地质背景的前提下，对冰凌山钙华的水化学、碳氧同位素和稀土元素作了研究分析，从而取得以下成果。
In premise of full understanding geologic background, the analysis of hydrochemistry, carbon-oxygen isotope and rare earth element (REE) were made, then the results yielded as follow.
论述水-岩作用过程氧氢同位素地球化学行为特征。
The geochemical behaviors of oxygen and hydrogen isotopes in water-rock interaction are discussed.
本文主要研究了煤系高岭岩的微量、稀土、氧同位素地球化学特征。
The paper presents the geochemical characteristics of trace elements, REE and oxygen isotopes of kaolin rocks.
本文主要研究了煤系高岭岩的微量、稀土、氧同位素地球化学特征。
The paper presents the geochemical characteristics of trace elements, REE and oxygen isotopes of kaolin rocks.
应用推荐