论文部分内容阅读
关于锑和砷的测定,在过去较长的时间里我们是用溴酸钾容量法测定锑、砷合量;同时另行取样,用蒸馏法或萃取法使砷与锑分离后测定砷含量,以差减法计算锑含量。在无产阶级文化大革命中,我们进行了锑、砷连续滴定试验,方法基于硫酸高铈能定量地氧化三价锑而不氧化三价砷;在滴定锑以后,再用溴酸钾滴定三价砷。两者都用甲基橙作指示剂,终点敏锐。适应于测定含2～600毫克锑、1～10毫克砷的试样。含砷10～30毫克时,由于溶样时砷有挥发,砷回收率偏低(96～98%)。含砷30毫克以上时,砷挥发损失严重,测
On the determination of antimony and arsenic, in the past long time we use the potassium bromate volumetric method for the determination of antimony, arsenic combined; at the same time separate sampling, distillation or extraction method to make arsenic and antimony separation and determination of arsenic content, Calculate the antimony content. In the Great Proletarian Cultural Revolution, we conducted continuous titration tests of antimony and arsenic. The method is based on the quantitative oxidation of trivalent antimony with ceric sulfate without oxidation of trivalent arsenic. After titration of antimony, trivalent arsenic is titrated with potassium bromate. Both methyl orange as an indicator, the end point sensitive. Adapt to the determination of 2 to 600 mg of antimony, 1 to 10 mg of arsenic samples. When arsenic is contained in the range of 10-30 mg, the recovery of arsenic is low (96-98%) due to the volatilization of arsenic in the sample. Arsenic 30 mg or more, volatile loss of arsenic, measured