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一、前言在氨水液相催化脱硫液中,含有大量 S_2O_3~=,这对采用碘量法进行 H_2S 的测定有严重的影响。用锌盐(或镉盐)沉淀液相中 S~=,之后沉淀在酸性介质中用碘氧化,以测定其含量,此系一个较经典方法,目前国内也广泛地应用。但此方法具体应用于组份较为复杂的氨水液相催化脱硫液中,要准确地测定 H_2S 的含量,就要受到很大干扰,因加入沉淀剂 ZnSO_4时,会产生下列反应:
I. Introduction In the liquid ammonia catalytic desulfurization solution containing a large amount of S 2 O 3 ~ =, which has a serious impact on the determination of H 2 S by iodometric method. With zinc salt (or cadmium salt) precipitation liquid phase S ~ =, after precipitation in an acidic medium with iodine oxidation, to determine its content, this is a more classic method, is currently widely used. However, this method is particularly applicable to the more complex liquid ammonia catalytic desulfurization liquid ammonia, to accurately determine the content of H 2 S, it will be subject to a great disturbance, due to the addition of precipitating agent ZnSO_4, the following reaction will occur: