Revised interpretation of the pre-treatment method of ferric thiocyanate-nitrite catalytic dynamic method in the national standard of"Determination of iodine in feeds"
In the revised GB/T 13882-2023"Determination of iodine in feeds",the revised content of the second method of ferric thiocyanate-nitrite catalytic dynamic method on pre-treatment was reviewed.Compared with the previous method,the preparation method of iodine standard working solution,dry ashing method and wet method were changed.The iodate radical in the sample was converted to iodide by ashing the sample at 580℃,and the iodine standard intermediate solution was treated at 580℃ to compensate for the iodine loss during the sample pretreatment.Compared with before the revision,the revised pre-treatment sample method and the standard series curve preparation method can significantly improve the accuracy of the meth-od.
feediodine contentferric thiocyanate-nitrite catalytic dynamic methodrevision of national standard
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