为避免在测定钢及生铁中之锰时用有毒性的亚砷酸,我们以硫代硫酸钠的溶液来代替它。同时加入作为接触剂的硝酸银的量能减少到最低限度。我们采用下述的分析步骤,在许多测定及以标准试样校正时,均完全证明其价值。加15毫升硫酸(1:6)于0.1克生铁或0.2克钢(注)中,适度的加热使之溶解,必须用尽可能稀的 To avoid using toxic arsenious acid in the determination of manganese in steel and pig iron, we replace it with sodium thiosulfate solution. At the same time, the amount of silver nitrate added as a contact agent can be reduced to a minimum. We used the following analytical procedure to fully demonstrate the value of many assays and calibrations with standard samples. Add 15ml of sulfuric acid (1: 6) to 0.1g of pig iron or 0.2g of steel (Note), moderate heating to dissolve, must be used as thinly as possible