| Make foodmate.com your Homepage | Wap | Archiver
Advanced Top
Search Promotion
Search Promotion
Post New Products
Post New Products
Business Center
Business Center

AOAC Official Method 974.36 Microchemical Determination of Bromine, Chlorine, or Iodine

  • Published: 2013-09-24
  • File Format: PDF
  • Views: 208   
  • Size: 43.89K
  • Language: English
  • Download Times: 742
enter the download page
AOAC Official Method 974.36 Microchemical Determination of Bromine, Chlorine, or Iodine
Oxygen Flask Combustion Method
First Action 1974
Final Action 1975
Surplus 1994
A. Apparatus and Reagents
(a) s-Diphenylcarbazone indicator.—1.5% alcohol solution. Heat to dissolve, if necessary. Prepare fresh daily.
(b) Bromophenol blue indicator.—0.05%. Dilute 5 mL 1% alcohol solution to 100 mL with alcohol.
(c) Mercuric nitrate standard solution.—Dissolve 1.7 g Hg(NO3)2×H2O in 500 mL H2O containing 2 mL HNO3 and dilute to 1 L. Adjust to pH 1.7, using pH meter, by adding HNO3 dropwise. Standardize as follows: Accurately weigh 4–6 mg KCl and transfer to 250 mL Erlenmeyer. Add 20 mL H2O and 80 mL alcohol, and stir magnetically at moderate speed. Add 5 drops bromophenol blue indicator and 0.5M HNO3 to yellow end point; then add 3 drops excess.
Add 5 drops s-diphenylcarbazone indicator and titrate at £5 mL/min with Hg(NO3)2 standard solution to orchid-pink. Subtract reagent blank. Repeat standardization ³3 times.
[ Documents search ]  [ ]  [ Notify friends ]  [ Print ]  [ Close ]

0 in all [view all]  Related Comments
more..Related Documents
Featured Documents
Top download this topics
Popular download
Processed in 0.026 second(s), 15 queries, Memory 0.67 M
Powered by Global FoodMate
Message Center(0)