A STUDY ON WATER QUALITIES OF ACID RAIN BASED ON MULITIVARIATE ANALYSIS AND TEMPORAL CHANGE ANALYSIS FOR ION CONCENTRATION RATIO

Abstract

Water qualities of acid rain were investigated on the basis of multivariate analyses and temporal change analysis for the percentage of major ion constituent. Results showed that rain in the rainy season (early summer) had higher NO_3^- and NH_4⁺ percentages than those in other seasons, and that the range of seasonal change of those ions was wider than other ions. Furthermore, the ratio of NO_3^-/nss-SO_4^2-was examined for its relationship with the amount of rainfall and rainfall intensity. Results showed that the ratio was high when the amount and the intensity were small. These results suggested that NO_3^-concentration was sensitive to the effect of rainfall characteristics because it was strongly influenced by washout process.