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Chemical Composition of Rainwater at Selected Sites on Upolu Island, Samoa

The study 
involved analysis of rainwater samples at four sites on Upolu Island, Samoa 
from November 2019 to April 2020. A total of 48 rainwater samples were analysed 
in order to determine the major cations (Na+, Mg2+, Ca2+, 
K+) and anions (Cl-, , ) in wet precipitation from the four sites. The 
average pH of the rainwater was 6.89, perhaps due to neutralization. Only 50% 
of the rain samples had a pH above 5.6. This shows strong inputs of alkaline species 
to rainwater samples in some sites. The average pH of samples higher than 5.6 
is due to high loadings of sodium ions. The rainwater samples are dominated by 
Na+, Ca2+, Mg2+, Cl- and . The principal cations and anions, in decreasing 
order, are Na+ > Mg2+ > Ca2+ > K+ and Cl- > > . The correlation study and the comparison of major 
ion composition with other sites revealed that rainwater ion composition is 
strongly influenced by marine sources rather than anthropogenic and terrestrial 
sources.