1. Applications of isotopes in environmental science
PB 饶子璇

2. What causes the variation of the isotopic abundance?
1. Decay of radioactive isotopes
2. Isotopic fractionation

3. ----dating techniques
To determine the time
----dating techniques
Uranium-lead dating method
This scheme has been refined to the point that the error margin in dates of rocks can be as low as less than two million years in two-and-a-half billion years.
Potassium-argon dating method
Potassium-40 has a half-life of 1.3 billion years, and so this method is applicable to the oldest rocks.
Rubidium-strontium dating method
This scheme is used to date old igneous and metamorphic rocks, and has also been used to date lunar samples.
Uranium-thorium dating method
Radiocarbon dating method
Chlorine-36 dating method
Lead-Caesium dating method

4. To find out what happened in the past

5. To identify the trophic level

6. To identify the trophic level

7. References https://en.wikipedia.org/wiki/Isotope_analysis#15N
John M. Hayes, (2004) An introduction to isotopic calculations (Woods Hole Oceanographic Institution)

8. Thank You!
September 21th , 2016