METHOD OF DETERMINING CHEMICAL COMPOSITION OF LIQUIDS VIA SPECTROPHOTOMETRY ON FLOW AND FLOW-DISCRETE AUTOANALYSERS Russian patent published in 2012 - IPC G01N21/27 

FIELD: chemistry.

SUBSTANCE: method involves feeding analysed samples using an automatic sample feeding machine and a peristaltic pump into a multichannel hydraulic system, heating the hydraulic stream in a temperature-control device in a colorimetric channel and continuous measurement of optical density of the hydraulic stream or flame emission in the burner of a flame photometer in a defined spectral region. Channels for feeding air and washing liquid are removed from the hydraulic system, and air bubbles falling into the hydraulic system are not removed before the hydraulic stream enters the cuvette of the colorimeter or the burner of the flame photometer and measurement of optical density or radiation intensity is carried out on the section of the hydraulic stream between air bubbles.

EFFECT: invention enables to wash the cuvette with the analysed sample itself and with air bubbles passing through the cuvette, resulting in sharp reduction in the effect of the previous sample on the next sample, which increases measurement accuracy and rate of operation.

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