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汞盐重铬酸钾测定铁,具有快速、准确等优点而被广泛采用。但该法除了引入剧毒汞、铬盐污染环境外,稍多量铜、砷、锑存在,严重干扰铁的测定。为避免汞、铬盐对环境污染及消除铜、砷、锑干扰,本文应用硫酸铈容量法,以钨酸钠作指示剂,SnCl_2-TiCl_3联合还原铁(Ⅲ)利用铜离子催化水中溶解氧以除去过量Ti(Ⅲ),并对测定铁时铜、砷、锑等离子影响进行了探讨。试验表明,在硫-磷混酸介质中,铜
Mercury potassium dichromate determination of iron, with the advantages of fast, accurate and is widely used. However, the law in addition to the introduction of highly toxic mercury, chromium salt pollution of the environment, a slight amount of copper, arsenic, antimony exists, seriously interfering with the determination of iron. In order to avoid the pollution of mercury and chromium salt to the environment and to eliminate the interference of copper, arsenic and antimony, this paper uses cerium sulfate volumetric method and sodium tungstate as indicator, and SnCl 2 -TiCl 3 combined with reduced iron (Ⅲ) uses copper ions to catalyze the dissolved oxygen in water The excessive Ti (Ⅲ) was removed and the influence of copper, arsenic and antimony ions on the determination of iron was discussed. Experiments show that in sulfur-phosphorus mixed acid medium, copper