The Detection of Silver in Rainwater: Analysis of Precipitation Collected from Cloud-seeding Experiments

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  • 1 Radiophysics Laboratory, CSIRO, Sydney, Australia
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Abstract

Measurements were made of the concentration of silver in precipitation samples collected in areas of Australia where cloud seeding with silver iodide has occurred. Silver was detected in 41 of 63 ‘seeded’ samples and in three of 23 ‘unseeded’ ones. Values of concentration of the silver were between 3 × 10−11 gm ml−1. There is some evidence that silver is detected more frequently when the precipitation falls from seeded clouds which have top temperatures <−15C.

Abstract

Measurements were made of the concentration of silver in precipitation samples collected in areas of Australia where cloud seeding with silver iodide has occurred. Silver was detected in 41 of 63 ‘seeded’ samples and in three of 23 ‘unseeded’ ones. Values of concentration of the silver were between 3 × 10−11 gm ml−1. There is some evidence that silver is detected more frequently when the precipitation falls from seeded clouds which have top temperatures <−15C.

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