Related Experiment Video
Updated: Aug 17, 2026

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
Published on: July 3, 2016
Analysis of a firn core for assessing POP seasonal accumulation on an Alpine glacier
Sara Villa1, Christian Negrelli, Valter Maggi
1Department of Environmental Sciences, University of Milano Bicocca, Piazza della Scienza 1, 20126 Milan, Italy. sara.villa@unimib.it
Abstract:
Organochlorine pesticides (DDTs, HCHs, HCB) and selected PCBs were analyzed in samples from a firn core drilled on the Lys Glacier (4240 m above sea level, Monte Rosa Group, Italian Alps) in Summer 2000. The samples covered a relatively short time interval (from 1997 to 2000) and a seasonal detail breakdown was possible. A probable seasonal trend was observed only for gamma-HCH, a pesticide currently used in some European countries. For all other chemicals, a seasonal trend was not evident, and this supports the hypothesis of the prevailing role of long-range transport in comparison with local emissions for POP pollution in high mountains. The role of temperature on air-snow exchange has also been highlighted.
Related Concept Videos
Precipitation Gravimetry
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
Stratified Sampling Method
To choose a stratified sample, divide the population into groups called strata and then take a...
Methods of Obtaining Topography
