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试样灰化后制成溶液,溴离子在硫酸酸性条件下,用高锰酸钾氧化成溴,溴和3-戊酮反应,定量生成2-溴-3-戊酮。然后用气相色谱法测定总溴量。方法简便,灵敏度高。检出限以溴计0.05μg/g。可以精确测定谷物中ppm水平的溴。1～100μg范围内的添加回收率为84.5～87.8%,谷物中本底浓度的氯和碘不影响本测定方法。试样灰化:称取粉碎的试样2g,放入镍坩锅中,加0.2g无水碳酸钠混匀,加5ml碱性乙醇胺,放置30分钟。放电热板上蒸发至干,
The sample is made into a solution after ashing. Bromine ion is oxidized to bromine by potassium permanganate under the acidic condition of sulfuric acid, and the reaction between bromine and 3-pentanone generates 2-bromo-3-pentanone quantitatively. The total bromine content was then determined by gas chromatography. Method is simple, high sensitivity. Detection limit to bromine 0.05μg / g. Accurate determination of ppm levels of bromine in grains. The recoveries ranged from 84.5% to 87.8% in the range of 1 ~ 100μg. The background concentrations of chloride and iodine in the grains did not affect the method. Ashing samples: Weigh crushed sample 2g, into the nickel crucible, add 0.2g of anhydrous sodium carbonate, add 5ml of basic ethanolamine, left for 30 minutes. Discharge the hot plate to dry,