Method for quickly determining content of barium in nickel salt solution

Abstract

The invention discloses a method for quickly determining the content of barium in a nickel salt solution. In 0.12 mol / L of hydrochloric acid medium, tribromoarsenazo and barium can form a stable purple complex, and according to the spectrophotometric analysis principle, accurate determination of the content of the barium in a nickel chloride solution or a nickel nitrate solution is completed. Themethod comprises the specific steps that 5.0 mL of 0.6 mol / L hydrochloric acid solution and 2.0 mL of 50 g / L ascorbic acid solution are added into the pretreated nickel chloride or nickel nitrate solution in a 25 mL volumetric flask in sequence and mixed evenly, then 5.0 mL of 1g / L tribromoarsenazo solution is added, and the volume is metered; with the reagent blank as a reference, the absorbancyis measured at the wave length of 620 nm, and according to the absorbancy value, the content of the barium in the to-be-measured solution is obtained on a working curve. By means of the method, the content of the barium is within the range from 0 microgram / 25 mL to 50 micrograms / 25 mL and accords with the Beer's law, and the apparent molar absorption coefficient epsilon is 4.64*10<4>Lmol<-1>cm<-1>; the recycling rate is 95-103%, RSD is smaller than 10%, the method is stable, reliable, quick and simple, and requirements for quick analysis of the barium in the nickel chloride and nickel nitrateproduction process can be met.

Description

technical field [0001] The invention belongs to the technical field of testing in the metallurgical and chemical industry, and in particular relates to a rapid determination method for barium ion content in the production process of nickel chloride or nickel nitrate. Background technique [0002] In the production process of nickel salts such as nickel chloride and nickel nitrate, in order to reduce the content of sulfate in the final product, it is generally necessary to add barium salt to reduce the content of sulfate in the process of production. In order to ensure the removal effect of sulfate, at the same time To ensure product quality, it is necessary to detect the barium content in the nickel salt solution in real time during the production process. At present, there are few reports on the analysis and research of barium in nickel salt solution in the field of domestic analysis. The traditional turbidimetric method has low sensitivity, poor reproducibility, and seriou...

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Problems solved by technology

At present, there are few reports on the analysis and research of barium in nickel salt solution in the field of domestic analysis. The traditional turbidimetric method has low sensitivity, poor reproducibility, and serious matrix interference; the literature reports atomic absorption spectrometry, and the flame method needs to use laughing gas. As a gas-supporting method, the sensitivity of the method is low and there are potential safety hazards. Although the graphite furnace method has high sensitivity, the matrix interference is serious, the analysis process is long, the equipment is expensive, and the operation requirements are high. This method is basically used for the determination of barium in water samples; In recent years, some progress has been made in the determination of barium by using new chromogenic reagents, but there are common disadvantages such as easy hydrolysis of coexisting ions, small allowable amount of matrix elements, and narrow linear range.

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