Invstigation And Analysis On Iodine In Drinking Water And In Iodine-rich Foods And The Present Situation Of Iodine Supplementation In Rizhao City

Objective:In view of the current thinking on implementation of iodine is carrying out mainly the prevention strategies of "scientific supplement iodine ", to offer the basic data and scientific foundation on control iodine deficiency disorders and scientific supplement iodine by investigating residential nutrition level of iodine in Rizhao city.Methods:In the context of the area, Investigation of iodine in drinking water\iodine levels of iodine-rich foods that has an important effect on residents diet\iodine in urine of children aged8～10years old\iodine level in urine of the case group of the patients with thyroid diseases and the control group\status of edible iodine salt in Rizhao city.Results:1. On the basis of method of GB/T5750.5-2006cerium sulfate catalyzing spectrophotometric of Iodide in drinking water, the study establishes the method of the determination of trace of iodine in drinking water. Compared with GB/T5750.5-2006cerium sulfate catalyzing spectrophotometric of Iodide in drinking water, it has advantages of simple operation, easy to control in test procedure, especially suitable for investigation of iodine in drinking water in areas of deficiency iodine in large quantities of water sample.2.3,369data collected within the scope of the investigation in the city’s water, median of iodine in drinking water is4.1μg/L on the whole, the median of iodine in drinking water in bailiwick respectively:Donggang District,4.0μg/L; Lanshan District,6.6μg/L; Wulian County,4.2μg/L; Ju County,3.2μg/L. Frequency distribution of its iodine in drinking water was statistical tested, there is statistically significant difference (X2=77.96, p<0.01). Medians of iodine in drinking water of all towns were less than10μg/L in Rizhao city, the differences among them, and the frequency distribution showed significant difference, also. The medians of iodine in drinking water of San-Huang town in Dong-Gang region and Long-Shan town, Ling-Yang town, Sang-Yuan town, Ku-Shan town, Dong-guan town etc, equal to1g/L. In addition, coastal towns and inland towns within the area of Rizhao city, whose median of iodine in drinking water are6.6μg/L and3.8μg/L;Its distribution of iodine in drinking water are significant difference statistically (X2=69.41, p<0.01).3. On base of differences of iodine content in iodine-rich foods, they are divided into high iodine-rich foods and other iodine-rich foods, the method for determination of iodine content in iodine-rich foods is established. By volumetric analytical methods for the determination of iodine content of high iodine foodsiodine in food, and arsenic-cerium oxide reduction catalyzed by iodine methods for the determination of iodine content of foods relatively low iodine content. Through the separation of the sample, eliminates sampling blindness in determination of samples, margin error caused by repeatedly diluting is overcome, also.Using appropriate analytical methods, samples of different iodine content were detected6times repeatly, the relative standard deviation at2.60%-9.52%.4. It detects and analyses iodine content in iodine-rich foods, gives reference value of iodine content in different iodine-rich. The iodine content of fresh clam, fresh razor clam, fresh Mytilus edulis, dried small shrimp, shrimp is in the lower, the average value of them is less than2mg/kg; the average value of wet kelp, finished the instant kelp, dried seaweed, refined dry laver are between19.6～118.0mg/kg, the iodine content of dry seaweed is higher; dry kelp is a good source of iodine, the iodine content of dry kelp is between164～3256mg/kg, the average value of iodine content of dry kelp is1050.8mg/kg.5. The survey collected476children’s urine samples of8～10years old, the median of urine samples is150.6μg/L; Investigation of urinary iodine level of case group suffer from thyroid disease and control groups, the median of urinary iodine of case group was slightly higher than in the control group, and frequency distribution of iodine in urine is not statistically significant differences in the two groups (X2=5.92,p>0.05);1322of salt samples collected, the rate of qualified iodized salt is96.9%, the consumption rate of qualified iodized salt is95.9%, the rate of non-iodized salt is 1.1%, the coverage rate of iodized salt is98.9%.Conclusions:1. The method of the determination of trace of iodine in drinking water being established that is considered simplicity of operation, test process easily being controlled,and suitable for measuring of large amounts example in Iodine Deficiency Area. Determination of iodine in drinking water through the investigation determined that the distribution of iodine in drinking water in Rizhao city, This study determined the distribution characteristics of iodine in drinking water in Rizhao city, the conclusion was given that the median of iodine in drinking water of coastal towns was slightly higher than inland towns, it offered the basic data and scientific foundation on control iodine deficiency disorders by investigating content of iodine in drinking water in Rizhao city.2. On base of differences of iodine content iodine-rich in foods, they are divided into high iodine-rich foods and other iodine-rich foods, the method for determination of iodine content in iodine-rich foods is established. It detects and analyses iodine content in part of the sample of iodine-rich foods in Rizhao City, gives reference value of iodine content in different iodine-rich. Contain iodine varies in different foods, different iodine content in iodine-rich foods are large different, Contain iodine of the same iodine-rich foods from different areas exist in large differences, different sampling locations for the same products containing iodine also varies.3. Rizhao city belong to iodine deficiency area, The uneven distribution of water iodine in drinking water in Rizhao city; determination of iodine in food is difference largely,Only from the perspective of food supplying iodine do not meet the body needs,residential nutrition level of iodine reaches up sufficient and slightly high state after implementation program of iodine supplementation. Along with the improvement of people’s scientific awareness of iodine supplementation, iodine nutrition level towards more reasonable.