直接进样离子色谱法测定食用碱中痕量无机阴离子  

Determination of trace inorganic anions in dietary alkali by ion chromatography with direct injection

作　　者：娄斌[1] 李阳[2] 马玲玲[2] 吕金凤[2] 唐清[2] 

机构地区：[1]中国石化天津石油分公司,天津300131 [2]天津师范大学化学学院

出　　处：《无机盐工业》2011年第1期61-62,共2页Inorganic Chemicals Industry

基　　金：天津师范大学实验教学改革研究基金资助(200902)

摘　　要：用Dionex ICS-1000离子色谱仪,Dionex AS14阴离子分离柱,以3.5 mmol/L碳酸钠-1.0 mmol/L碳酸氢钠为淋洗液,直接进样分析食用碱中的痕量无机阴离子。该法无需样品前处理,直接进样,电导检测,高浓度碳酸钠的存在不影响痕量阴离子的测定。所测的无机阴离子的检出限均在0.012 6 mg/L以下,线性相关系数为0.998 5~0.999 8,相对标准偏差为1.153%~3.218%（n=5）,回收率为93.77%~96.00%,符合分析测定要求。Trace inorganic anions in dietary alkali were directly injected and analyzed by Dionex ICS-1000 ion-chromatograph and Dionex AS14 column with 3.5 mmol/L Na2CO3-1.0 mmol/L NaHCO3 as eluent.This method didn′t need sample pretreatment and the existence of high concentrated sodium carbonate will not impact the determination of trace anions due to direct sample injection and conductivity detection.Detection limits for inorganic anions were all lower than 0.012 6 mg/L.Linear correlation coefficient was at 0.998 5～0.999 8.Relative standard deviation（RSD） was at 1.153%～3.218%（n=5）.Standard sample recovery rate was at 93.77%～96.00% which accorded with analysis and measurement requirements.

关 键 词：离子色谱法 阴离子 食用碱 

分 类 号：TQ131.12[化学工程—无机化工]