Method for detecting sulfate content by conductivity titration

Abstract

The invention discloses a method for detecting sulfate content by conductivity titration. The method comprises the following steps of: step 1, taking a to-be-detected aqueous solution sample having asulfate concentration of less than or equal to 100 ppm; step 2, adding an excess barium chloride standard solution into the to-be-detected aqueous solution sample to obtain a mixed system; step 3, adding a dispersing agent into the mixed system, then adding hydrochloric acid or nitric acid to adjust the pH value to 5-8 to obtain a treated to-be-detected aqueous solution sample; step 4, performingtitration on the treated to-be-detected aqueous solution sample by taking a standard solution of soluble sulfate as a titrant, and recording the titration curve of the relationship of the conductivityand the total titration volume after each titration; step 5, stopping the titration when the conductivity of the treated to-be-detected aqueous solution sample increases linearly with the addition ofthe standard solution of soluble sulfate to obtain a volume V2 of the standard solution of the soluble sulfate consumed corresponding to the titration end point; step 6, calculating the concentrationof sulfate in the to-be-detected aqueous solution sample.

Description

technical field [0001] The invention relates to a method for detecting ion content, in particular to a method for detecting sulfate content by conductometric titration. Background technique [0002] Part of sulfur trioxide or sulfate is adsorbed in the fly ash of coal-fired boilers. Operators care about this indicator to guide the stable operation of the denitrification system. In addition, there is no direct detection method for the content of ammonium bisulfate and sulfuric acid mist in the flue gas. The concentration of ammonium bisulfate and sulfuric acid mist can be indirectly measured through the sulfate radical in the fly ash, so the detection of sulfate radical content is very important . [0003] At present, there is no standard for the detection of sulfate content in fly ash, and the detection of ions in fly ash is more focused on the detection of ammonium ions in fly ash. There are many methods for the detection of sulfate in solution, but all of them have limit...

AI Technical Summary

Problems solved by technology

It is difficult to determine the amount of barium and magnesium added when EDTA titration is used to detect sulfate radicals in samples; and the difference in chromaticity and turbidity in spectrophotometry leads to insufficient reproducibility and accuracy; ion chromatography, which is more commonly used in laboratories, Equipment is expensive and not portable

[0004] The conductometric titration method for the detection of sulfate has been used in the detection of trace sulfate in pulp and the anion content of murals in the early days, and can obtain relatively fast and accurate measurement results. The technical requirements of personnel are relatively high and have not been widely used

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