Analysis of ammonium and phosphates concentration time series in river water
I. Yu. Drozdov, Alexander V. Aleksakhin, Yu.V. Aleksakhina, D. A. Petrusevich · IOP Conference Series Earth and Environmental Science · 2021
Abstract The Ammonium prediction in river water and the Phosphate prediction in river water datasets (provided by the Ukrainian government) have been handled. The ARIMA (p, d, q) model of low order (p4 or q>4) have been constructed to describe behaviour of concentration time series at different river stations. Orders and coefficients in the first case are obtained via information criteria minimization. In the second case the ACF and PACF functions analysis is used. The ArDL(p, q) models are used to investigate correlation between concentrations of ammonium and phosphates at different river stations. Dependence of these parameters at the target water station and at other stations is confirmed with statistical tests. Conclusions about water pollution are made.