Selective and quantitive control of chemical sample - simple method controls one or several chemical types in reaction medium

摘要

The controlled chemical type is at least selectively detected in the reaction medium and at least an electrical of measuring signal is formed which exclusively characterises the chemical type, this signal being proportional to the reactional quantity of the chemical type. The measuring signal is compared with an electrical reference signal which is proportional to at least a reference quantity of the controlled chemical type. From the comparison is obtained a control differential signal which is specific of the chemical type. In the reaction medium a regulated quantity, of at least the controlled chemical type, is introduced or extracted, this quantity being proportional to the controlled differential signal.