Rapid Photometric Determination of Tin in Canned Juice Using Improved Oxidized Hematoxylin Reagent

抄録

For the rapid determination of tin in canned juice, an improved oxidized hematoxylin method has been investigated.
Sample was prepared by digesting 1ml of canned juice with a mixture of sulfuric acid-nitric acid. To 0.2-2.0ml of sample, each 0.1ml of 10% tartaric acid and a drop of 1% phenolphthalein were added. After neutralizing, 2ml of 1% arabic gum were further added. The solution was diluted to 15ml with water, and 5ml of 0.3% improved oxidized hematoxylin reagent was added and mixed well. The solution was allowed to stand for 40min at room temperature, and then was further diluted to 40ml with 0.5% sulfuric acid. The absorbance of the solution was determined at 560nm of the wave length against the reagent blank.
Under the condition described above, it was found that tin content in some kinds of canned juice could be determined with recovery 94-110% and coefficient variation about 5%.