当试样中被测组分含量极微时,若将它分离并富集到少量溶液中,就提高了浓度。但是,这一方法只能提高被测物的相对含量,而其总量不变。如果用化学反应将被测物的绝对数量增大,这样可用常量化学分析法测定低含量的组成,这种方法叫倍增反应或放大反应。倍增反应增加了测定某些离子的灵敏度。本文用倍增反应测定海带浸液中的碘。测定原理在测低含量的碘化物时,首先用高碘酸盐作氧化剂,使碘离子氧化为碘酸盐。其反 When the content of the test sample is very small, if it is separated and enriched in a small amount of solution, the concentration is increased. However, this method can only improve the relative content of the measured object, and its total amount does not change. If the chemical reaction will increase the absolute number of analytes, so you can use a constant chemical analysis of low-level composition, this method is called double or amplification reaction. The doubling reaction increases the sensitivity of certain ions. In this paper, double reaction was used to determine iodine in kelp immersion liquid. Determination of the principle In measuring low levels of iodide, the first periodate as an oxidant, iodide ion oxidation of iodate. The opposite