PPT-Biogeochemistry I Introduction to Isotopes

Prosper Zigah Woods Hole Oceanographic Institution pzigahwhoiedu 1 What are Isotopes Why care about stable isotopes Expressing Isotopic abundances Isotope effects Isotopicmass balance calculations twocomponent and multiplecomponent mixing models. Isotopes. Isotopes. : atoms of the same element that have different numbers of neutrons. Two isotopes of an element will have the same atomic number, but different mass numbers (and atomic masses). CARBON (above right). Isotopes(2) Isotopes(4) Theaverageatomicmass(alsocalledtheaverageatomicweightorjustatomicweight)ofanelementisdenedastheweightedaverageofthemassesofallitsnaturallyoccurringstableisotopes.Forexample,th 3.1. Carbon isotopes and the global carbon cycle3.2.1. Photosynthesis, respiration, export productivity, and surface-deep gradients3.2.3. Jasmine . Sudhu. 5/30/13. Chemistry 10.. What are Isotopes?. Isotope – Is the average mass of atoms. You round of the atomic mass to the nearest whole numbers to get your two possible Isotopes.. Example – Boron- Atomic mass = 10.81. After rounding to the closet two whole numbers which are 10 and 11, your . Speaker: Abstract Title: ‘ Clumped Isotopes’ Outline: Clumped isotopes refer to the occurrence of two or more rare isotopes in one molecule. The abundance of clumped isotopes in the s Lecture 30 . Beginnings. Stable isotope geochemistry is concerned with variations in the isotopic compositions of elements arising . small . differences in the chemical behavior of different isotopes of an . What is it?. Isotopes are different versions of atoms having the same number of protons but different numbers of neutrons.. Atomic Mass. The mass of each isotope is different due to the different number of neutrons.. NEON’s 30-year sampling strategy for monitoring ecosystem productivity and biogeochemistry includes co-located measurements of plant structure, biomass, soil and plant biogeochemistry, and microbial populations. The resulting data can be used to address a wide variety of questions related to ecosystem science. This overview focuses on the measurements associated with two specific components of this design: soil biogeochemistry and microbial diversity (page 2), and plant structure and biogeochemistry (page 3). Scaling point measurements of these ecosystem components across space relies heavily on NEON’s Airborne Observation Platform (AOP), which will fly over all NEON sites annually to collect . Neutrons. Electrons. Charge. 1. 0. -1. Mass . 1 . amu. 1 . amu. 0. Location. nucleus. nucleus. Electron cloud. Isotopes. Atoms that have the same number of protons, but have different numbers of neutrons. What number equals the number of protons?. Atomic Number. From the periodic table – . How is the mass of a “regular” (most abundant) atom determined?. Protons Neutrons = Atomic Mass. An Isotope is defined as…. Atoms of the same element . can. have different . mass numbers.. Isotopes. How can atoms of the same element end up with a different mass?. Shoulder Partners. Frederick Soddy. (1877-1956) proposed the idea of isotopes in 1912. Question:. . What are the . nitrogen (N) and phosphorus (P) effects on C-Climate and C-concentration feedbacks . (. gamma. . and . beta. ) . in the presence of Land Use and N and P deposition trajectories. Decay Data and Medical . I. sotopes . Essential for determining:. Overall dose. Specific dose. Imaging background. Production cross section. Over half were last studied >30 years ago !!. 30 Years ago: 1-2 small detectors. Two or more forms of an element that have the same number of protons but different numbers of neutrons, leading to different atomic mass.. Two types: . radioactive. and . stable. Stable isotopes do NOT break down (decay) over time..