Multivariate Analysis in Monthly Variation of Pesticides Residues in River and Sea Waters in Nagoya City

Abstract

Eighteen kinds of pesticides at ten sites of rivers and five sites of a bay in Nagoya City were measured every month in 2017 by liquid chromatography tandem-mass spectrometry (LC/MS/MS). The concentrations of the pesticides fluctuated in months and seasons. Also, the concentration profiles of the pesticides fluctuated between months. The data obtained between April and July were analyzed by multivariate analysis. By a cluster analysis, a kind of the multivariate analysis, concentration profiles of the pesticides were discriminated into three types of waters collected in river, sea and the intermediate between river and sea. By the principal component analysis, another kind of the multivariate analysis, the factor 1 was mostly affected by Tricyclazole, Cumyluron and some other pesticides. By the factor analysis, a kind of the multivariate analysis, the common factors affecting pesticides concentration were suggested to be three: the primary factor might be pesticides applied to rice farming, the secondly factor might be those applied to fruit growing, and the third factor might be those applied to vegetable cultivation and fattening pens.