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《Journal of Anhui Agricultural Sciences》 2008-09
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Determination of Bromide Ion in Water Containing Iodine by Phenol Red Spectrophotometry

DONG Wei-guang(Department of Chemistry,Mudanjiang Normal College,Mudanjiang,Heilongjiang 157012)  
[Objective] The purpose was to research the determination method of bromide ion in water containing iodine so as to reduce the determination error.[Method] The trace bromide ion in water containing iodine was oxidated with sodium nitrite,derived with butanone,extracted by cyclohexane and determined by phenol red spectrophotometry(PRS).After iodide ion was eliminated,5 samples of water containing iodine were selected to determine the precision,and then the standard solutions containing 2.00、4.00、6.00、8.00、10.00 μg bromide ions were accurately added into them so as to conduct recovery experiment.[Result] The results from the experiment on precision showed that the RSD of determining trace bromide ion in water containing iodine by PRS was 0.59%.The results from the experiment on recovery showed that the average recovery of the method could be up to 96.58%.[Conclusion] The determination of trace bromide ion in water containing iodine by PRS had more stable results and higher accuracy.
【CateGory Index】: X832;O661.1
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