Abstract
Boron is sensitively determined by spectrophotometry after color development with curcumin, but, the presence of a large amount of iron interferes with the color development. Therefore, in order to separate boron from the iron, boron is allowed to react with methanol to form trimethyl borate ester which is separated from iron by distillation. The distilled ester is trapped into sodium hydroxide solution. For color development with curcumin, water in the solution must be removed by evaporation. The procedure is time-consuming. In order to shorten the time, an apparatus for the distillation is modified to carry out simultaneously both distillation of the ester and evaporation of water in sodium hydroxide solution which traps it. Hence, the time of these procedures is shortened to 25 min from about 90 min of a conventional procedure. Boron reacted with curcumin is extracted with 4-methyl-2-pentanone. The detection limit of boron in iron corresponds to 0.048 μg/g.
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