Abstract

A detection system for chlorinated hydrocarbons (CHCs) in water has been based on a mid-infrared (MIR) fibre optic physicochemical sensor, the measurement principle being attenuated total reflection (ATR), with the IR-beam coupled into an ATR-element, an IR-transparent silver halide fibre. At each reflection the penetrating energy is attenuated by the IR-absorbing analytes present in the surrounding polymer matrix. The aim of the present study was to investigate multivariate calibration techniques for use of this sensor system to determine CHCs in water. Partial least-squares regression was compared with standard univariate calibration. The spectral range from 950 to 750 cm-1 was measured for different aqueous CHC solutions with the fibre-optic set-up coupled to a Fourier-transform infrared spectrometer. Mixed standards of tetrachloroethylene, trichloroethylene and chloroform in water were measured according to a central composite design.

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