Evaluation of the stability of iodine in iodized salt against heat, light and humidity in distributed salt in babol

Asieh Khalilpour,1 Abdoliman amouei,2 Hossein ali asgharnia,3 Mojgan rezapour,4 Zahra moulana,5 Seyede houriye fallah,6,*



The effect of iodine on the human is inevitable in all stages of life and the lack or deficiency of iodine causes mental retardation and the huge cost of the treatment and care. the aim of this study was to evaluate the effect of heat, humidity and light on the iodine content in iodized salt.


In this analytical-descriptive study, five brands of refined iodized salts were randomly selected from supermarkets in babol city. all tests were performed in the chemistry laboratory of paramedical school in babol university of medical sciences. in the current study, the samples were kept for three months in the conditions of humidity, without humidity, light, darkness, temperature 370c, refrigerator and ambient temperatures. the iodine of samples was tested every 15 days. titration method based on britain pharmacopoeia method was used to measure the iodine. data were analyzed with t paired and anova tests using spss.


The results showed that the iodine reduction was observed in all samples. the iodine reduction was 9.69, 8.34, 8.85, 7.8, 13.96, 9/6, 8/64 and 5/41 mg/l for refined salts at refrigerator temperature with humidity, refrigerator temperature without humidity, 370c with humidity, 370c without humidity, ambient temperature with light and humidity, ambient temperature with light and without humidity, ambient temperature with humidity in darkness and ambient temperature without humidity in darkness, respectively.


The reduction of iodine was higher in humidity, light and refrigerator temperature than in dryness, darkness and 370c, respectively. the results indicated that the best condition for keeping the salt was ambient temperature, darkness and non-humidity situation.


Iodine, iodized salt, humidity, light, heat