Accelerated potentiometric titration of sulfides and cyanides

Journal Article · Mon Jan 01 04:00:00 EST 1979 · Coke Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6244401

Dyatel, S G; Peskova, D V; Zyskina, F A

Titration with a mercury (II) nitrate solution and potentiometric end-point indication have been suggested for analysis of carbonization-plant effluents to determine their hydrogen sulfide, hydrogen cyanide, and bound and free ammonia contents. This technique, which permits differential determination of the components in a single solution aliquot without separation has a number of drawbacks. For example, the thin-layer platinum electrode used as an indicator rapidly goes out of adjustment and its working surface cannot be regenerated in the normal plant laboratory. Direct use of a silver chloride comparison electrode for determination of chloride ions is not permissible. Use of a titrant with a high concentration (0.4 to 0.5 N) inevitably increases the determination error. Plotting of the differential titration curve prolongs the analytic procedure. In order to reduce the time required for such determination and make them simpler, we investigated the feasibility of potentiometric titration of sulfides and cyanides wit a bimetallic electrode pair (platinum and tungsten), using a compensation-type setup. The titrant was a 0.05 to 0.1 N mercury (II) nitrate solution. It has been established that platinum and tungsten electrodes can be used for accelerated potentiometric titration of sulfides and cyanides with an Hg(NO/sub 3/)/sub 2/ solution. The methodological prinicples for this titration technique have been worked out.

• OSTI ID: 6244401
• Journal Information: Coke Chem. USSR (Engl. Transl.); (United States), Journal Name: Coke Chem. USSR (Engl. Transl.); (United States) Vol. 1; ISSN COKCA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010401* -- Coal & Coal Products-- Carbonization-- (-1987)
010900 -- Coal
Lignite
& Peat-- Environmental Aspects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
CHALCOGENIDES
CHEMICAL ANALYSIS
COKING PLANTS
CYANIDES
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
LIQUID WASTES
OXYGEN COMPOUNDS
POTENTIOMETRY
SULFIDES
SULFUR COMPOUNDS
TITRATION
WASTE WATER
WASTES
WATER