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本文报告借助于析出法络合滴定钢,并指出适宜的测定条件。当Ba~(+2)与SO_4~=离子的克分子比大于1:3时,Ba—EDTA定量地破坏,氨化后应于30分钟内滴定,否则由于BaSO_4部分地溶解于EDTA而使结果偏低。Ba~(+2)离子含量在10～20毫克范围内标准滴定曲线呈直线关系,且通过原点,证明本法有定量关系。Pa~(+2)离子含量再高时,由于所生BaSO_4沉淀较多,致使终点不易观察。C_e~(+2)及少量Pb~(+2),Sr~(+2)在测定条件下不干扰。应用本法测定铜矿中钢的测定,其结果与重量法很相近,其最大误差不超过0.5％。
This paper reports the titration of steel by precipitation method, and points out the suitable measurement conditions. When the molar ratio of Ba ~ (+2) to SO_4 ~ = ions is greater than 1: 3, Ba-EDTA is destroyed quantitatively and titrated within 30 minutes after ammonification. Otherwise, BaSO_4 partially dissolves in EDTA, Low. The standard titration curve of Ba ~ (+2) ions in the range of 10 ~ 20 mg shows a linear relationship, and through the origin, it is proved that this method has a quantitative relationship. Pa ~ (+2) ion content is high, due to the birth of BaSO4 precipitation more, so that the end is not easy to observe. C_e ~ (+2) and a small amount of Pb ~ (+2), Sr ~ (+2) do not interfere with the measurement conditions. Application of this method for the determination of copper in the determination of copper, the results are very similar with the weight method, the maximum error of not more than 0.5%.