Table 5

Correlation matrix (Pearson) for the investigated variables

VariablesMost freq. size (nm)Mean size (nm)Part. conc. (parts/mL)Dissolved conc. (μg/L)pHConductivity (μS)Turbidity (NTU)TDS (ppm)Tyrosine-like (I)Tryptophan-like (II)Fulvic acid-like (III)Microbial by-product-like (IV)Humic acid-like (V)
Most freq. size (nm) 1 0.986 −0.385 0.996 0.170 0.912 −0.147 0.876 0.554 0.872 −0.537 0.592 −0.697 
Mean size (nm) 0.986 1 −0.228 0.996 0.246 0.963 −0.285 0.944 0.566 0.901 −0.562 0.557 −0.686 
Part. conc. (parts/mL) −0.385 −0.228 1 −0.304 0.450 0.003 −0.694 0.101 −0.021 −0.054 −0.035 −0.301 0.200 
Dissolved conc. (μg/L) 0.996 0.996 −0.304 1 0.193 0.946 −0.201 0.913 0.548 0.892 −0.531 0.562 −0.684 
pH 0.170 0.246 0.450 0.193 1 0.271 −0.578 0.372 0.858 0.531 −0.879 0.700 −0.716 
Conductivity (μS) 0.912 0.963 0.003 0.946 0.271 1 −0.388 0.982 0.498 0.902 −0.484 0.423 −0.597 
Turbidity (NTU) −0.147 −0.285 −0.694 −0.201 −0.578 −0.388 1 −0.545 −0.283 −0.254 0.464 −0.054 0.138 
TDS (ppm) 0.876 0.944 0.101 0.913 0.372 0.982 −0.545 1 0.535 0.877 −0.563 0.433 −0.598 
Tyrosine-like (I) 0.554 0.566 −0.021 0.548 0.858 0.498 −0.283 0.535 1 0.788 −0.965 0.958 −0.971 
Tryptophan-like (II) 0.872 0.901 −0.054 0.892 0.531 0.902 −0.254 0.877 0.788 1 −0.716 0.733 −0.865 
Fulvic acid-like (III) −0.537 −0.562 −0.035 −0.531 −0.879 −0.484 0.464 −0.563 −0.965 −0.716 1 −0.907 0.908 
Microbial by-product-like (IV) 0.592 0.557 −0.301 0.562 0.700 0.423 −0.054 0.433 0.958 0.733 −0.907 1 −0.974 
Humic acid-like (V) −0.697 −0.686 0.200 −0.684 −0.716 −0.597 0.138 −0.598 −0.971 −0.865 0.908 −0.974 1 
VariablesMost freq. size (nm)Mean size (nm)Part. conc. (parts/mL)Dissolved conc. (μg/L)pHConductivity (μS)Turbidity (NTU)TDS (ppm)Tyrosine-like (I)Tryptophan-like (II)Fulvic acid-like (III)Microbial by-product-like (IV)Humic acid-like (V)
Most freq. size (nm) 1 0.986 −0.385 0.996 0.170 0.912 −0.147 0.876 0.554 0.872 −0.537 0.592 −0.697 
Mean size (nm) 0.986 1 −0.228 0.996 0.246 0.963 −0.285 0.944 0.566 0.901 −0.562 0.557 −0.686 
Part. conc. (parts/mL) −0.385 −0.228 1 −0.304 0.450 0.003 −0.694 0.101 −0.021 −0.054 −0.035 −0.301 0.200 
Dissolved conc. (μg/L) 0.996 0.996 −0.304 1 0.193 0.946 −0.201 0.913 0.548 0.892 −0.531 0.562 −0.684 
pH 0.170 0.246 0.450 0.193 1 0.271 −0.578 0.372 0.858 0.531 −0.879 0.700 −0.716 
Conductivity (μS) 0.912 0.963 0.003 0.946 0.271 1 −0.388 0.982 0.498 0.902 −0.484 0.423 −0.597 
Turbidity (NTU) −0.147 −0.285 −0.694 −0.201 −0.578 −0.388 1 −0.545 −0.283 −0.254 0.464 −0.054 0.138 
TDS (ppm) 0.876 0.944 0.101 0.913 0.372 0.982 −0.545 1 0.535 0.877 −0.563 0.433 −0.598 
Tyrosine-like (I) 0.554 0.566 −0.021 0.548 0.858 0.498 −0.283 0.535 1 0.788 −0.965 0.958 −0.971 
Tryptophan-like (II) 0.872 0.901 −0.054 0.892 0.531 0.902 −0.254 0.877 0.788 1 −0.716 0.733 −0.865 
Fulvic acid-like (III) −0.537 −0.562 −0.035 −0.531 −0.879 −0.484 0.464 −0.563 −0.965 −0.716 1 −0.907 0.908 
Microbial by-product-like (IV) 0.592 0.557 −0.301 0.562 0.700 0.423 −0.054 0.433 0.958 0.733 −0.907 1 −0.974 
Humic acid-like (V) −0.697 −0.686 0.200 −0.684 −0.716 −0.597 0.138 −0.598 −0.971 −0.865 0.908 −0.974 1 

Values in bold are different from 0 with a significance level alpha = 0.05.

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