茜素紫褪色光度法测定食盐中碘
Photometric Determination of Iodine in Table Salt by Oxidation Decoloration of Alizarin Purple
摘 要
提出了加碘盐中碘含量测定的光度分析法,在约0.1 mol·L-1硫酸条件下碘酸根氧化茜素紫使其褪色;在茜素紫的吸收峰456 nm波长处测定时,其吸光度的降低程度(ΔA)与碘质量浓度在50.0 mg·L-1以内呈线性关系.方法的相对标准偏差小于1%,平均回收率为104.5%.
碘
褪色
茜素紫
食盐
Photometry
Iodine
Decoloration
Alizarin purple
Table salt
Abstract
Based on the color-fading of alizarin purple by oxidation with iodate in a H2SO4 solution of ca. 0.1 mol·L-1,a photometric method for determination of iodine in table salt was proposed. The magnitude of decrease in absorbance (ΔA) was found to keep linear relationship with concentration of iodine in the range within 50.0 mg·L-1 as measured at the absorption maximum of 456 nm. Test for recovery was made by standard addition method and value of average recovery obtained was 104.5%. Precision was tested at 5 different concentration levels for 6 determinations,values of RSD′s found were all less than 1%.
中图分类号 O657.31
所属栏目 工作简报
基金项目
收稿日期 2008/4/11
修改稿日期
网络出版日期
作者单位点击查看
备注马占玲(1969-),女,辽宁朝阳人,硕士,副教授,研究方向为商品检验与分析教学和研究工作.
引用该论文: MA Zhan-ling. Photometric Determination of Iodine in Table Salt by Oxidation Decoloration of Alizarin Purple[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2009, 45(7): 803～804
马占玲. 茜素紫褪色光度法测定食盐中碘[J]. 理化检验－化学分册, 2009, 45(7): 803～804
共有人对该论文发表了看法，其中：
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】毕强,穆春林,周勇,等.学院食堂厨师对碘盐缺乏病认识程度调查分析[J].中国学校卫生,2001,21(2):113．
【2】GB 5461-2000食用盐[S]．
【3】黄会秋.气相色谱法测定加碘食盐中的碘[J].食品科学,2002,23(1):122-123．
【4】黄典文,叶雪芬.酸性铬蓝K褪色光度法测定食盐中微量碘的研究[J].理化检验-化学分册,2001,37(4):170．
【5】王明,罗大莉.二甲酚橙褪色光度法测定微量碘的研究[J].理化检验-化学分册,2000,36(3):114．
【2】GB 5461-2000食用盐[S]．
【3】黄会秋.气相色谱法测定加碘食盐中的碘[J].食品科学,2002,23(1):122-123．
【4】黄典文,叶雪芬.酸性铬蓝K褪色光度法测定食盐中微量碘的研究[J].理化检验-化学分册,2001,37(4):170．
【5】王明,罗大莉.二甲酚橙褪色光度法测定微量碘的研究[J].理化检验-化学分册,2000,36(3):114．
相关信息
