摘要
在酸性介质中,溴化钾存在下,碘酸根对靛蓝胭脂红有褪色作用,且褪色程度与碘酸根的量有关,从而建立了碘的光度测定新方法。方法的最大吸收波长在610nm处,碘定量测定的线性范围为0～18μg/10ml。方法操作简单,快速、重现性好,用于加碘食盐中碘的测定,结果满意。
It is found that in the medium of H2SO4,the discoloration of indigo carmine is quickened by IO3 with the presence of KBr. The discoloration of indigo carmine is found to be directly proportional of the amount of iodine in table salt. Based on these facts,a new spectrophotometric method for the determination of iodine in table salt was proposed. The decrease of absorbance (ΔA) was measured at the wavelength of 430 nm which is the absorption maximum of indigo carmine. The linear range is 0 to 18 μg/10 ml for ...
出处
《食品科学》
EI
CAS
CSCD
北大核心
2009年第2期174-175,共2页
Food Science
