Sulfate radical titration method

A sulfate and titration technology, applied in the field of analytical chemistry, can solve the problems of relatively limited sulfate concentration, complex interaction, and single titration system.

Inactive Publication Date: 2015-11-18
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has certain limitations: this method discloses that when MgO is greater than 55 mg, 2 to 3 ml of concentrated acetylacetone solution can be added, but to what extent it is not mentioned
The interaction between particles in the titration solution is relatively complex, and the titration system of the current research is relatively simple, which has great limitations when applied to the determination of the sulfate concentration in salt lake brine

Method used

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Experimental program
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Effect test

Embodiment 1

[0060] Embodiment 1: Accurately take by weighing the sample solution 5g containing sulfate radical in conical flask, then add the 5%MgCl ​​of about 0.56g 2 solution to make Mg 2+ / SO 4 2- The mass ratio is 0.27, and the potassium ion concentration before adding the titrant is 0.37mg / g. After mixing evenly, add 2ml of acetylacetone solution for masking. After stirring for a period of time, add 13mL of acetic acid solution to make the pH of the solution about 2.1. Add about 6mL of absolute ethanol, mix well, add 8 drops of alizarin red indicator. Titrate with barium chloride solution to pink as the end point. The content of sulfate radical in the sample can be obtained according to the consumption of the titrant, and the content of sulfate radical can be calculated according to the standard potassium sulfate at the same time, and the error of the two calculations is 0.03%. The experimental result data is calculated according to formula (2).

[0061]For the brine with too hi...

Embodiment 2

[0062] Embodiment 2: Accurately take by weighing the sample solution 5g that contains sulfate radical in conical flask, then add the 5%MgCl ​​of about 4.4g 2 solution to make Mg 2+ / SO 4 2- The mass ratio is 2.2, and the potassium ion concentration before adding the titrant is 0.36mg / g. After mixing evenly, add 3ml of acetylacetone solution for masking. After stirring for a period of time, add 5mL of acetic acid solution to make the pH of the solution about 3.5. Add about 10 mL of absolute ethanol, mix well, and add 10 drops of Alizarin Red Indicator. Titrate with barium chloride solution to pink as the end point. The content of sulfate radical in the sample can be obtained according to the consumption of the titrant, and the content of sulfate radical can be calculated according to the standard potassium sulfate at the same time, and the error of the two calculations is 0.01%. The experimental result data is calculated according to formula (2).

Embodiment 3

[0063] Embodiment 3: Accurately take by weighing the sample solution 5g that contains sulfate radical in conical flask, then add the 10%MgCl ​​of about 4.2g 2 solution to make Mg 2+ / SO 4 2- The mass ratio is 4.1, and the potassium ion concentration before adding the titrant is 0.23 mg / g. After mixing evenly, add 10 ml of acetylacetone solution for masking. After stirring for a period of time, add 3 mL of acetic acid solution to make the pH of the solution about 3.5. Add about 20mL of absolute ethanol, mix well, and then add 10 drops of alizarin red indicator dropwise. Titrate with barium chloride solution to pink as the end point. The content of sulfate in the sample can be obtained according to the consumption of the titrant, and the content of the sulfate is calculated according to the standard potassium sulfate, and the error of the two calculations is 0.1%. The experimental result data is calculated according to formula (2).

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Abstract

The invention discloses a sulfate radical titration method. The sulfate radical titration method comprises steps as follows: a sample containing sulfate radical is taken, a sample solution is prepared, a MgCl2 solution is added, the mass ratio of Mg<2+> to SO4<2-> is 0.27-7.20, 250-500 mg/g of an acetylacetone solution with the concentration being 0.5-14.0 ml is added, 5-15 mL of an acetic acid solution is added after the mixture is uniformly mixed, the pH (potential of hydrogen) of the solution is 2.0-3.7, 5-20 mL of alcohol solvents are added, the mixture is uniformly mixed, an alizarin red indicator is dropwise added, the mixture is titrated with a barium chloride solution until the mixture becomes pink, and the content of sulfate radical is calculated according to the use amount of barium chloride. The method can be well applied to analysis of the content of sulfate radical in salt lake brine. Besides, the method has the advantages of accuracy, convenience, rapidness, simpleness and the like.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a method for titrating sulfate radicals. Background technique [0002] There are many types of salt lakes, which can be divided into chloride-type salt lakes, sulfate-type salt lakes, carbonate-type salt lakes, etc., which contain various anions and cations, and the common coexisting ions are Na + , NH 4 + 、K + , Li + , Ca 2+ , CO 3 2- , B 4 o 7 2- , Mg 2+ , Cl - , where chlorine is a constant element in salt lakes. Salt lake brine contains sulfate, and the corresponding sulfate can be obtained from salt lake brine, such as gypsum (CaSO 4 2H 2 O), Epsom salt (MgSO 4 ·7H 2 O), thenardite (Na 2 SO 4 10H 2 O), kainite (KCl MgSO 4 ·3H 2 O) and lapis lazuli (SrSO 4 )Wait. [0003] In the process of separating sulfate by Alizarin Red weighing titration, barium chloride is used as titrant, so the systematic error of chloride ion can be offset. In a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 孙柏钟远李武吕鹏
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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