Chemistry: physical processes – Physical processes – Crystallization
Patent
1977-04-18
1978-10-17
Serwin, R.E.
Chemistry: physical processes
Physical processes
Crystallization
204 1T, 204195T, 422 67, 422 75, 422 77, 422100, B01K 300, G01N 3116
Patent
active
041206576
ABSTRACT:
The invention relates to a process of and equipment for a selective, quick and accurate analysis of liquid samples. According to the process of the invention a liquid or a gas sample absorbed by a liquid is allowed to flow at a constant volume rate and overtitrated with an amount of a reagent adequate to the measurement in a definite time. Then the flow of the reagent is decreased to zero in a definite time, meanwhile continuously following, in a known way, the changes occurring in the reaction mixture. The determination of the concentration is carried out by comparing the time elapsed between the appearances of the two chemical equivalence points with calibration curves prepared with standard solutions, said time having a well defined functional relationship with the concentration of the sample.
The equipment according to the invention for carryinng out the process according to the invention contains an analysis channel in contact with a sample-storage tank or liquid storage tank or sampling device or liquid feeding device, said analysis channel comprising a gas-permeable membrane contacting a sample gas before the titration section if desired, said analysis channel being equipped with a pump, said analysis channel having a titration section comprising a small-volume flowthrough homogenizing space and a reagent feeder or reagent generator device coupled to a programming unit and joining said channel before the said homogenizing space. For the measurement and recording of changes occurring in time, said analysis channel has, in its section between said homogenizing space and the suitably shaped effluent section, a detector section containing one or more detectors and a recording and/or indicator unit; if desired, said analysis channel has an electronic signal processing unit coupled to the recording and/or indicator unit and to the programming unit.
The accuracy of analyses carried out by the process and equipment according to the invention is identical with or higher than that of automatic titrators, and its velocity is identical with that of measurements carried out by flowthrough analysis channels, combining in this way all the advantages of both methods and measuring instruments.
REFERENCES:
patent: 3195982 (1965-07-01), Nicholson
patent: 3870466 (1975-03-01), Rellstar et al.
Feher Zsofia
Havas Jeno
Nagy Geza
Pungor Erno
Toth Klara
Egyt Gyogyszervegyeszeti Gyar
Serwin R.E.
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