RAPID DETERMINATION OF Zn IN Al ALLOYS BY EDTA TITRATION METHOD

Journal Article · Fri Jan 01 04:00:00 EST 1960 · Nippon Kinzoku Gakkaishi (Japan)

OSTI ID:4078380

Wakamatsu, S

Zinc in the presence of aluminum and tin was titrated with EDTA. To avoid the interference of aluminum and tin, NH/sub 4/F was used. The method was successfully applied to the determination of zinc in aluminum alloys. The procedure is as follows: Weigh a 2 g sample into a beaker and dissolve it in 30ml of 20% NaOH solution and 5ml of 30% H/sub 2/O/sub 2/. After boiling out the excess H/sub 2/O/sub 2/, add Na/sub 2/S solution, cool, dilute to volume in a 500- ml volumetric flask, and filter through a dry filter paper. Fe, Mn, Cu, Ni, Ti, Ca, Mg, etc., remain on the filter paper as hydrous oxides or sulfides. Pipet 10 to 50 ml of the filtrate into a beaker and dilute to about 70ml with water. Make it slightiy acid with HCl and 3 g of NH/sub 4/F (to mask aluminum and tin) and 5ml of 50% CH/sub 3/COONH/sub 4/ solution. Adjust the solution to a pH of 5 to 6 with 1 to 1 NH/sub 4/OH. Heat at 70 to 80 deg C, add 3 to 4 drops of indicator (PAN), mix and titrate with 0.005M EDTA solution. Then back-titrate the excess EDTA with 0.005M CuSO/sub 4/ solution. (auth)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-005968
• OSTI ID: 4078380
• Journal Information: Nippon Kinzoku Gakkaishi (Japan), Journal Name: Nippon Kinzoku Gakkaishi (Japan) Vol. Vol: 24; ISSN NIKGA
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

ACETATES
ALUMINUM ALLOYS
AMMONIUM COMPOUNDS
BOILING
CALCIUM
CHEMISTRY
COOLING
COPPER
COPPER SULFATES
EDTA
FILTERS
FLUORIDES
HYDROCHLORIC ACID
HYDROGEN PEROXIDES
HYDROXIDES
IRON
MAGNESIUM
MANGANESE
NICKEL
PAPER
QUANTITATIVE ANALYSIS
SODIUM HYDROXIDES
SODIUM SULFIDES
SOLUTIONS
SULFIDES
TEMPERATURE
TIN
TITANIUM
USES
ZINC