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在洁净的样品(试样及标准试样)表面加2滴(约为0.1毫升)4—5％的NaOH或KOH溶液。待作用完毕后,用玻制小吸管将溶液移入瓷坩埚中。样品表面以水洗涤2次,每次用水1滴,在已变黑的合金样品表面上加2滴稀HNO_3(1:1),此时不溶于碱的成份,包括Mn在内,均将溶解。样品表面再用水洗涤3—4次。所得溶液置于坩埚内,加入6—7滴稀硝酸(1:1),于电热板上加热约1分钟,使溶液变清。将澄清溶液移入10毫升量筒
Add 2 drops (about 0.1 ml) of 4-5% NaOH or KOH solution to the clean sample (sample and standard sample) surface. After the action is finished, the solution is transferred into the porcelain crucible using a glass pipette. The sample surface was washed twice with water, one drop of water each time. Two drops of dilute HNO 3 (1: 1) were added to the surface of the blackened alloy sample. At this time, the alkali-insoluble components, including Mn, . The surface of the sample is then washed 3-4 times with water. The resulting solution was placed in a crucible, 6-7 drops of dilute nitric acid (1: 1) was added and heated on a hot plate for about 1 minute to clear the solution. The clear solution was transferred to a 10 ml graduated cylinder