Chemistry: physical processes – Physical processes – Crystallization
Patent
1975-04-14
1976-10-05
Reese, Robert M.
Chemistry: physical processes
Physical processes
Crystallization
23254E, 23255E, 324 29, 324 71R, G01N 2124, G01N 2744, G01N 3122
Patent
active
039842045
ABSTRACT:
A method for monitoring the toxic constituent of an ambient gas e.g. sulphur dioxide in air involves bringing the gas into contact with a solution containing one component in which the gas is soluble and an indicator having optical transmission characteristics responsive to the quantity of the constituent in solution. An electric current is then passed through a second component which is electrolysed to neutralise the solution and restore the transmission characteristics of the indicator to a datum, the quantity of current passed being representative of a change in transmission characteristics from the datum and therefore in the case of the concentration of the toxic constituent where sulphur dioxide in air is to be monitored the air is bubbled through water in which the sulphur dioxide dissolves. The water contains hydrogen peroxide to convert the sulphur dioxide in solution to sulphuric acid which is effective to change the color or optical density of a pH responsive indicator such as methyl orange. The second component in this case is a suitable electrolyte which can be electrolysed to form a base effective to neutralise the acid so as to maintain the indicator at the color or optical density level selected as the datum. Such an electrolyte is sodium chloride which forms sodium hydroxide as a base.
REFERENCES:
patent: 2949345 (1960-08-01), Clauss
patent: 3567392 (1971-03-01), Schulze
patent: 3723062 (1973-03-01), Dahms
patent: 3897315 (1975-07-01), Riseman et al.
Boniface Hugh John
Jenkins Rhys Haydn
British Steel Corporation
Reese Robert M.
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