px919557
Joined: 29 Jul 2010
Posts: 236
Read: 0 topics
Warns: 0/5
Location: qefrqn
|
 Posted: Thu 11:46, 07 Apr 2011 Post subject: Kelp soak time and the loss of iodine in kelp rela |
|
|
Seaweed and kelp in the soaking time the relationship between the loss of iodine
. 1990 World Summit for Children through the effective way to combat iodine deficiency disease in one. but a lot of people before eating kelp, kelp soaked on. kelp immersion of the iodine in kelp without loss, has not been reported. To this end, we are soaking time and kelp kelp loss of iodine were studied, the results show that when more than 5 minutes soaking time kelp, kelp is lost in most of the iodine. 1 Experimental mainly experimental materials and equipment 1.1 key material kelp, potassium iodide (AR), sodium bicarbonate (AR), hydrazine hydrate sodium hydroxide (reagents were of analytical grade) 1.2 U.S. Diane major equipment companies 2010-I Ion chromatography; UV detector; conductivity detector; AS4A separation column; 500m1 oxygen bottles. 2 Experimental method 2.1 soaking kelp seaweed placed in a commercially available drying oven temperature of 8O ℃ to constant weight, cooled, the surface of the soil and other dirt kelp beat clean. Accurately weigh 1.2 grams about 7 copies of dried seaweed, placed in a beaker of 7 100m1, with 100m1 100m1 flask accurately check the amount of deionized water, were placed in the 7 beaker containing kelp, were soaked in l, 35 Received: 1998 -04-12 Fort Lan Kwai Lan Charles Hall Ken Church ± Zhu barrier plastic Triple differential barrier 110,20,60,120390 minutes after cutting, remove the kelp. leach solution were taken 1m1 t deionized water content of dry volumetric flask in i00mi tested. 2.2 measured by ion chromatography Kelp soaking in iodine because I diffuse out of the ionic radius of a large, more easily polarized deformation J, and anion exchange resin affinity far greater than in other common anions, it is easy and other common anions separated. To improve the analysis speed, we use a denser sodium bicarbonate eluent, this concentration of sodium carbonate eluent 6, OmmoIlL, sodium bicarbonate concentration of 2,8 moltL. In this conditions, I and other anions one can not only be well separated, and the peak shape of the peak speed is good, see Figure l. Ion chromatography method to measure I 'most sensitive detector is a pulsed amperometric detector, but this detector is not as wide range of applications, many users do not configure ion chromatography. Ion chromatography detector commonly used conductivity detector and a UV detector I, low sensitivity, we will not conductivity detector and UV detector in series, two detector at the same time detection, UV detection wavelength selection 2l5rim, (I have one in an absorption peak near 215nm), by detecting the noise, I control the concentration of 50uglL of a high peak, reached 246,810 this condition, the minimum detectable concentration of UV detection To 10ugtL, conductivity seized Figure 1 kelp IMMERSION ion chromatogram detected small measured the concentration of 25ug / L. Because the minimum detectable UV detection eluent:.. few Nco, strike low concentration, so we The data are listed later in this article are the use of detector: UV. Wavelength: 215nm UV detector data collected. As the data from the conductivity detection, we used UV detector with the results compared to more reliable results . seaweed soaking immersion time in I content of a test data shown in Table 1, Table l different immersion time of the leaching amount of iodine in kelp 2.3 Oxygen flask combustion-ion chromatography of a tame soaked the rest of the iodine in the kelp different times of soaking kelp drying oven at 80 ℃ to constant weight, were accurately weighed 8 ~ 10rag,[link widoczny dla zalogowanych], treatment by oxygen flask combustion, absorb liquid H {10 毫升 O.25mc ~ lfLNaOH solution, add 4 drops of 3% hydrazine hydrate solution, after the oxygen flask combustion thin absorption constant volume with deionized water at 25m1 flask. measured by ion chromatography with one of them I NORMAL UNIVERSITY 8 6 1998 volume. test conditions and test kelp soaked Liquid test conditions are identical. Results Table 2 Table 2. iodine in kelp different soaking time remaining amount of 3 Results and discussion According to Table 1 and Table 2 lists the data, soaking time out of different leaching rate of iodine in kelp, The results in Table 3. It can be seen, when the kelp soak for more than 5 minutes, most of the iodine in kelp lose both. Therefore, to reduce the loss of iodine in kelp, kelp Do not soak before eating, cleaning time is not too long Table 3. not
The post has been approved 0 times
|
|
