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钢铁中硫的测定,目前采用最普遍的是燃烧-碘量法。它快速,适用范围广,准确度能满足一般要求。缺点是有时结果不稳,原因是多方面的。在产生二氧化硫的瞬间难于控制好的滴定速度和在大量气泡干扰下难于判断准确的滴定终点,是主要原因之一。本文利用酸性高锰酸钾溶液吸收二氧化硫而褪色,测量吸收液(以水作参比值)的吸光度的改变,从而测定硫的含量,即“间接比色法”,基
Determination of sulfur in steel, the most commonly used is combustion - iodometric method. It is fast, wide range of applications, accuracy can meet the general requirements. The disadvantage is sometimes the result is unstable, for many reasons. One of the main reasons is the difficulty of controlling the titration speed at the moment of generating sulfur dioxide and the difficulty of judging the accurate titration end point under the interference of a large number of bubbles. In this paper, acid potassium permanganate solution to absorb sulfur dioxide and fade, absorbance measurement (absorbance as a reference value) of the absorbance changes in order to determine the content of sulfur, namely “indirect colorimetric method”, based