Method and device for digitizing, archiving, characterisation and analysis of a liquid sample

摘要

The liquid sample is taken, a spectrophotometric analysis takes a characteristic frequency spectrum of the sample, the spectrum is sampled to obtain a series of samples at successive frequencies, the value of the samples is digitized and the data is stored for each sample giving the time and date for each sample and each frequency The spectrophotometric analysis comprises a photooxidation and measuring the UV absorption spectrum for the photooxidized sample. A library of measurements is built up so each new sample can be compared to a model spectrum developed from the library data and the weighting of each component can be calculated. The calculation is validated by establishing a regression line relating the measured results to the calculated results. The same base model is used for samples from the same or similar sources. When the liquid to be analyzed is an industrial effluent, the standard products are pure substances such as nitrates, nocylene, tributylcathechol, nitrate ions and ethylpropylacrylene, as well as global UV absorption spectra for normal qualifying effluents. The base model is created by selecting and introducing into the model the relative data for M known pure product spectra; the selection of a (remarkable) sample spectrum held in the library and a decomposing of the sample spectrum to know the contribution of the pure substance spectra and to determine the residual fraction relative to the known spectra. The parts of the sample spectrum obtained from the known pure substance spectra are then discounted and the process repeated to model the residual fraction, until the model is complete. A verification phase then ensures that the maximum distance between the model and the sample is below a set threshold. Device for carrying out the above process.