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无汞盐法测定铁,目前多以钨酸钠为判别指示剂,三氯化钛还原铁(Ⅲ)后,以重铬酸钾氧化过量的三氯化钛,此法已列为锰矿石化学分析国家标准(GB1505—1522—79),它虽然消除了汞害,但铬是致癌物,铬的污染尚不容忽视。因此,目前迫切需要一种无汞无铬,而又能适应日常生产的测定方法。钛量法在这方面有优越性,只因未找到理想的指示剂和钛(Ⅲ)
Mercury-free salt method for the determination of iron, sodium tungstate for the current identification of many indicators, titanium trichloride reduction of iron (Ⅲ), with potassium dichromate excess titanium trichloride oxidation, this method has been listed as manganese ore chemistry Analysis of national standards (GB1505-1522-79), although it eliminates mercury damage, but chromium is a carcinogen, chromium pollution still can not be ignored. Therefore, there is an urgent need for a mercury-free and chromium-free assay which can be adapted to daily production. Titanium method has advantages in this regard, simply because no ideal indicator and titanium (III)