The features of toxicants detection in natural waters with high salts content using piezoelectric quartz crystal microbalance

In this article we discuss the features of detection of microconcentration toxicants (ammonia, butanol-2, toluene) in natural waters with different salt concentration using the piezoelectric crystal quartz microbalance on gas analyzer “MAG-8” with injection input of sample. The samples of sea water were classified into groups by values of electro conductivity, total mineralization and hardness. Piezoelectric microbalance of equilibrium gas phase over sea water samples carried out in eight-sensors chamber (electrodes modifiers - multilayer carbon nanotubes, propolis (bees wax), polyethylene glycol 2000, polyethylene glycol sebacate, dinonylphthalate, three octylphosphate, methyl orange with polystyrene, Triton X-100) in static condition. The electrodes modifiers were chosen by criteria of minimal sensitivity to water vapors and different (crossing) sensitivity to vapors of anthropogenic pollutants. The primary analytical information of sensors array is integral characteristic of gases mixtures over water sample - “visual print” of sensors. It has been shown the dependence of “visual print” square of sensors array responses on concentration salts and electro conductivity of sea water samples. Using the methods of additives it is established the behavior of influence the microconcentarion of ammonia, butanol-2, toluene on summary indicator of sensor array. The possibility of toxicant identification in model solutions using selected identification parameters A ij is demonstrated. It has been shown the classification of sea water samples with toxicants additives by parameters of sorbtion efficiency and optimization of piezosensors array for analysis of natural water using the processing of sensors output data by principal component analysis. The most significant to separation of water samples with toxicant there are responses of sensors with films from polyethylene glycol sebacate, dinonylphthalate, three octylphosphate, and the electro conductivity of natural water is less significant.