Process of measuring chemical and physical parameters for characterization and classification of aqueous suspensions

A method of determining physical and/or chemical properties in water samples containing suspended substances and/or particles, the physical and/or chemical properties being singly or jointly determined as amount of nitrate, iron, ammonium, phosphate, total nitrogen or total phosphorous;

• turbidity, chemical oxygen demand (COD) and/or biological oxygen demand (BOD), characterised in,
• (a) that all water samples are unfiltered and
• (b) that during an extensive calibration, involving a large number of water samples being typical for a condition to be studied and wherein physical and/or chemical properties have been determined by means of standard methods, is performed by spectroscopic absorbance measurements at several discrete wavelengths within ultraviolet and/or visible spectra, whereupon
• (c) sample evaluations continuously or intermittently are performed on water samples by means of spectroscopic absorbance measurements at several discrete wavelengths within ultraviolet and/or visible spectra and whereupon
• (d) all data obtained during the calibration and the sample evaluations together with numeric quantities giving the physical and/or chemical properties of the samples used during the calibration are processed by means of algorithms in a mathematical-statistical model.