CAJ | 학술논문

抗坏血酸溶液在紫外有最大吸收峰，在稀盐酸介质中，微量的碘酸钾能氧化抗坏血酸溶液而使吸光度降低，降低程度与碘酸钾浓度成正比，从而建立了紫外分光光度法测定碘含量的新方法。方法是体系反应后于最大吸收波长243 nm处测量吸光度。碘酸钾浓度在0．1～4．0μg/mL范围内呈良好的线性关系，相关系数为0．9981，摩尔吸光系数2．3×104 L/mol·cm。用此法测定食盐中微量碘含量，RSD最大值4．20％（n＝5），加标回收率在90．2％～107．0％之间。
항배혈산용액재자외유최대흡수봉，재희염산개질중，미량적전산갑능양화항배혈산용액이사흡광도강저，강저정도여전산갑농도성정비，종이건립료자외분광광도법측정전함량적신방법。방법시체계반응후우최대흡수파장243 nm처측량흡광도。전산갑농도재0．1～4．0μg/mL범위내정량호적선성관계，상관계수위0．9981，마이흡광계수2．3×104 L/mol·cm。용차법측정식염중미량전함량，RSD최대치4．20％（n＝5），가표회수솔재90．2％～107．0％지간。
A new method is established for the determination of trace iodine.The ascorbic acid solution has the maximum absorption peak in the ultraviolet;in HCl medium,trace potassium iodate can oxidize ascorbic acid solution so as to make absorbance reduce,and the degree of decrease is proportional to the concentration of potassium iodate.Method:Measure the absorbance at the maximum absorption wavelength of 243 nm after system reaction.Potassium iodate concentration in the range of 0.1~4.0μg/mL has good linear relationship, the correlation coefficient is 0.9981,the molar absorptivity is 2.3×104 L/mol·cm.The method has been used in the determination of trace iodine in common salt.The maximum RSD (n= 5)is 4.20%,the recovery of standard addition is between 90.2% and 107.0%.