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以高碘酸钾作氧化剂,使锰氧化成高锰酸显色的测定法,其唯一缺点为氧化速度缓慢。我们采用银作催化剂,快速测定高铬镍系列钢中的锰,可以增快其氧化反应速度,并对显色温度和在一定条件下铬的干扰作了条件试验(使用MSC-1B微机高速比色计)。试验表明,锰含量小于150μg/ml符合比尔定律,当含量范围在1%～2%时,其相对标准偏差为1.35%。分析步骤:称取试样0.1000g置于250ml锥形瓶中,加入10ml盐-硝混酸(1+1),加热溶解;再加10ml混合酸(H_2SO_4+H_3PO_4+H_2O=6+5+2),加热至冒白烟,取下加水25ml,加5ml硝酸银-尿素溶液(10g AgNO_3加5ml
With potassium periodate as an oxidant, the oxidation of manganese into permanganate chromogenic assay, the only drawback is the slow oxidation. We use silver as a catalyst for rapid determination of manganese in high-chromium-nickel series steels, which can accelerate the oxidation reaction rate and test conditions of color temperature and chromium interference under certain conditions (using MSC-1B microcomputer high-speed colorimeter ). The experiment shows that the Beer’s law is obeyed when the manganese content is less than 150μg / ml, and the relative standard deviation is 1.35% when the content is between 1% and 2%. Analysis steps: Weigh the sample 0.1000g placed in 250ml conical flask, add 10ml salt - Nitric acid (1 +1), heated to dissolve; plus 10ml mixed acid (H_2SO_4 + H_3PO_4 + H_2O = 6 +5 +2) , Heated to take white smoke, remove the water 25ml, add 5ml silver nitrate - urea solution (10g AgNO_3 plus 5ml