离子色谱法测定糙米中微量总溴的研究

本文研究了在有乙醇存在的碱性介质中，含溴熏蒸剂中的溴被转化为无机溴，随后用带电导检测器的离子色谱进行分离测定的方法。在Ｄｉｏｎｅｘ ＡＳ４Ａ分离柱上，用１．０ｍｍｏｌ／Ｌ ＮａＨＣＯ３／２．０ｍｍｏｌ／Ｌ Ｎａ２ＣＯ３作为流动相进行洗脱，被测组份得到了满意的仞了。方法简便、快速。对样品中溴离子的检测限为１．２５ｍｇ／ｋｇ，相对标准偏差与回收率分别为５．７３％和９４．９％。首次用于实际糙米样品中微量

Determination of Bromide Residue in Rice by Ion Chromatography With Conductivity Detector

In the presence of alcohol in NaOH medium, a rapid and sample method for the determination of inorganic bromide which was transformed from fumigant containing bromide was developed by ion chromatograph with conductivity detector A solution containing 1. 0 mmol/L NaHCO3-2. 0 mmol/L Na2CO3 was used as eluate on a Dionex AS4A column. The detection limit of trace Br- in rice sample was 1. 25 mg/kg, the relative standard deviation and the recovery of this method were 5. 73% and 94. 9%, respectively. This method has been used to determine trace bromide in rice with satisfactory results.