 Wysłany: Sob 21:10, 02 Kwi 2011 Temat postu: Measurement of iodine _530 |
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| Measurement of iodine
The connected electrode (working electrode of a glass electrode; Pt electrode a pair of electrodes, one reference electrode Ag / person gcl electrode), +0.95 V potential electrolysis in the enrichment of 3min, rest 30s, to 250m / s scanning speed sweep to a 0.2V, recording the second derivative peak current value of the wire, the peak potential for a + O. 1V (VS.Ag/AgC1), at - 0.2V elution / rain,tn requin pas cher, repeat the operation for the second measurement, the sample with standard addition quantification. 3.3 Determination of the optimal conditions for the base solution: 4 × 10mol / 1 cetyl ammonium bromide four: 0.1mol/IHSO; 7.5 × 10 ~ mol/1KBr. When the enrichment time 26.3 rain, I 1-45ng/ml a concentration within the range of linear relationship between peak potential value of the L4 treatment flask combustion method can be directly applied to the determination of its iodine content. 3.47 Sample preparation 3.4.1 Sample Analysis, Combustion 3.4.2 Determination of the burning sample a constant volume of absorption solution to 50ml, were determined by experimental results shown in Table 5. Standard deviation of <8.8. 4. Atomic Absorption Spectrometry Determination of Iodine L5] (omitted) 5. Power for the spectrofluorimetric determination of trace amounts of iodine ridicule (abbreviated), detection limit of concentration of lng / ml. Samples of biological samples measured by oxygen recovery in 94-119, and the relative iodine over several measurement methods, experimental device has a simple, fast, speed of processing a large number of samples can lead and so on. Through our analysis and comparison of these experiments that the multiplier method to measure the iodine in kelp extract the best method. In addition to the above-mentioned advantages of its methods, sources of experimental samples also has a wide range, easily controlled experimental conditions, the relative standard deviation is small, the advantages of large recoveries, suitable for widely. Table 5 Determination of chicken blood and liver samples of the results of the name of chicken blood samples of chicken liver and number 193121.431.783. I measured a concentration OO3.244.38 1.491.742.9O2.875.13 (mg / g) 1.351.6O3.252.724.791.5O1.943. I added a content of O2 6.46.488889.69.68443.244.84.8 (rag / g) 888 I a 6.656.678.637.611.49.184.244.303.924 recovery criteria .9 O content (rag / g) 9.377.527.747.69.168.43.3O5.28 I mean a content 1.441.763.042.944.77 (mg / g) relative standard 4.87 .94.98.87.9 deviation () [ ,],[ |
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