离子液体作为新型光度增敏剂测定食品中微量铝(Ⅲ).pdfVIP

156 ※分析检测 2013,VoL34,No。06 食品科学 离子液体作为新型光度增敏剂测定 食品中微量铝(Ⅲ) 沙鸥1…，丁军楠1，马卫兴1 (1．淮海工学院化学工程学院，江苏连云港 222005：2．扬州大学化学化工学院，江苏扬州225002) 摘要：建立以离子液体溴化十四烷基咪唑盐(c，。minBr)作为新型光度增敏剂测定食品中铝(III)含量的方法。在 pH值为4．8的Britton—Robinson缓冲液中，离子液体C14 表观摩尔吸光系数s621=1．942X105L／(mol·cm)。将该法用于粉丝与粉皮中微量铝的测定，结果与火焰原子吸收光度 法测定结果一致，回收率在97．8％～101．8％之间。 关键词：离子液体；食品；铝；增敏 DeterminationofTraceAluminuminFoodsIonic Sensitized Method by Liquid Sepctrophotometic SHAOul”，DINGJun—nanl，MA Wei—xin91 ofChemical Instituteof (1．School 222005，China： Engineering，HuaihaiTechnology，Lianyungang of 225002，China) 2．DepartmentChemistry，YangzhouUniversity，Yangzhou was Abstract：Anewionic sensitized method onthebasisofthe liquid sepctrophotometicdeveloped AI(III)一chromeazurol the ofBdtton—Robinsonbuffersolutionat S(CAS)一l一胛一tetradecyl一3一methylimidazolium(C14minBr)system．Inpresence pH colorreactionof chromeazurol besensitizedtheadditionofionic 4．8，the AI(III)with S(CAS)couldby liquid，C14minBr． Themaximum ofthe was621 nlnandthe absorptionwavelengthstationaryternarycomplexAI(III)一CAS—C14minBr apparent molar coefficientofthe was1．942×103 lawwas for inthe of L／(mol’cm)．Beer’S AI(IIll absorption complex obeyed range