Method for determining molybdenum and titanium elements in low alloy steel by adopting shared mother liquor

Abstract

The invention discloses a method for determining molybdenum and titanium elements in low alloy steel by adopting a shared mother liquor. The method comprises the following steps: 1) preparing the mother liquor: adding nitric acid, heating and dissolving, adding a sulfuric acid solution when a sample is completely dissolved and a big bubble phenomenon appears, continuously heating, adding water to dissolve the salt when salt crystals appear at the bottom of a bottle, dry and solid salt is discharged and no flowing solution exists at the bottom of the bottle, taking down and slightly cooling to room temperature after big bubbles appear during dissolving, adding water to a constant volume, and uniformly mixing; 2) determining molybdenum: adding sulfuric acid, ammonium thiocyanate and an ascorbic acid solution into the mother liquor, diluting with water to a scale, uniformly mixing, standing at room temperature for 10 to 20 minutes, and measuring the absorbance; and 3) determining titanium: adding ascorbic acid, oxalic acid, chromotropic acid solution and sodium sulfite into the mother liquor, diluting to the scale, and measuring the absorbance. According to the method, the color development waiting time can be effectively utilized for interpenetrating operation, the time is fully utilized, the two elements of molybdenum and titanium are rapidly measured, mother liquor sharing is achieved, and the accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, and in particular relates to a method for measuring molybdenum and titanium elements in low-alloy steel by using a shared mother liquor. Background technique [0002] At present, in the determination of molybdenum and titanium in low-alloy steel, the early sample treatment and preparation of the mother liquid need to complete the sample dissolution and preparation respectively. In the detection, the same operation steps need to be completed twice, and the detection time becomes longer, which cannot be fast and accurate. Complete inspection. [0003] Wang Zhengming et al. (National Academic Conference on Chemistry and Spectral Analysis. China Mechanical Engineering Society, Editorial Department of Physical and Chemical Inspection, 2008.) used spectrophotometry to jointly determine the content of molybdenum, niobium, vanadium, and titanium in carbon steel and low alloy steel, but there a...

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Problems solved by technology

[0002] At present, in the determination of molybdenum and titanium in low-alloy steel, the early sample treatment and preparation of the mother liquid need to complete the sample dissolution and preparation respectively. In the detection, the same operation steps need to be completed twice, and the detection time becomes longer, which cannot be fast and accurate. complete inspection

[0003] Wang Zhengming et al. (National Academic Conference on Chemistry and Spectral Analysis. China Mechanical Engineering Society, Editorial Department of Physical and Chemical Inspection, 2008.) used spectrophotometry to jointly determine the content of molybdenum, niobium, vanadium, and titanium in carbon steel and low alloy steel, but there are still The operation method is difficult to master and control, and the operation time is long

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