Age dating sediments

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In the water phase 210Pb is adsorbed to particulate matter and together they are deposited in the sediment. The remaining amount of 210Pb at a certain depth will reveal the age of the given sediment layer.This dating method covers the past period of 75-100 years due to the half-life of about 22 years.The amino group of one amino acid can combine with the carboxyl group of a second amino acid to form a "peptide" bond, and its carboxyl group can combine with the amino group of a third amino acid, and the chain can thus be extended indefinitely.The amino acids combine with each other like the links of a chain to form a long protein chain.Thus, it will be possible not only to describe the sediment age, but also to give a picture of the dominant mixture of plankton alga at the same time.

All of the amino acids which occur in proteins, except for glycine, which is the simplest amino acid, have at least one asymmetric carbon atom, and can exist as one of two possible stereoisomers.This gas produces 210Pb by decay in the atmosphere.The lead isotope enters the earth’s crust or the water through precipitation.Scope of application Dating of sediment is used to calculate sedimentation rate and accumulation rates for different substances.A number of studies have focused on the accumulation of heavy metals during the past 100 years.

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