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本文以铋酸钠为锰的显色,加入铋作为磷发色的催化剂,用抗坏血酸(VC)还原测定磷。测定硅仍用熟知的亚铁还原硅钼蓝法。手续简便,结果较好。 以铋酸钠为氧化剂测定锰以2N硫酸和室温为宜。充分摇匀1～3分钟。发色后在一小时半内未见退色。显色液在530nm处有最大吸收。用VC还原测定钢铁中磷,由于大量铁干扰,使加热显色后很快退色。以铋盐催化虽可在室温显色,但稳定性差。本法采用柠檬酸为掩蔽剂,消除硅铋铁砷等干扰,在1N酸度下加热显色。显色液至少在6小时内稳定,重现性较好。
In this paper, sodium bismuth for the color of manganese, bismuth was added as a catalyst for phosphorus color, with ascorbic acid (VC) reduction determination of phosphorus. Determination of silicon is still well-known ferrous reduction silicon molybdenum blue method. Procedures are simple, the result is better. Determination of manganese with sodium bismuthate as oxidant 2N sulfuric acid and room temperature is appropriate. Shake well 1 to 3 minutes. Within a hour and a half after hair color no fade. Color liquid maximum absorption at 530nm. Determination of phosphorus in steel by the reduction of phosphorus, due to a large number of iron interference, the color soon after the heating fade. Although bismuth salt can be catalyzed at room temperature color, but poor stability. This method uses citric acid as a masking agent to eliminate the interference of silicon, iron, bismuth, iron and arsenic, heating and coloring under 1N acidity. The color developing liquid is stable within 6 hours at least, the reproducibility is better.