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Method for titration of sulphate radical

A sulfate and titration technology, applied in the field of analytical chemistry, can solve the problem that sulfate cannot be accurately titrated, and achieve the effect of a wide range of applications

Inactive Publication Date: 2015-04-08
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] In order to solve the technical problem that sulfate radicals in salt lake brine cannot be accurately titrated, the present invention uses alizarin red as an indicator, and provides a new method for titrating sulfate radicals by adjusting alcohol content and pH

Method used

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  • Method for titration of sulphate radical
  • Method for titration of sulphate radical
  • Method for titration of sulphate radical

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1: Accurately weigh 5g of sample solution containing sulfate radicals in a conical flask, add 3mL of acetic acid solution (A), make the pH of the solution about 2.1, add about 5mL of absolute ethanol, mix well, add alizarin dropwise Red indicates 4 drops (alizarin red concentration corresponds to 0.000872%). 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 sulfate is calculated according to the standard potassium sulfate, and the error of the two calculations is 0.25%. The experimental result data is calculated according to formula (1).

Embodiment 2

[0063] Embodiment 2: Accurately take by weighing 5g of the sample solution containing sulfate radicals in the Erlenmeyer flask, add 4mL of acetic acid solution (A), make the solution pH about 3.5, add about 6mL of absolute ethanol, add dropwise alizarin red after mixing 13 drops of indicator (alizarin red concentration is equivalent to 0.00263%). 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 between the two calculations is 0.18%. The experimental result data is calculated according to formula (1).

Embodiment 3

[0064] Embodiment 3: Accurately take by weighing 5g of the sample solution containing sulfate radical in the Erlenmeyer flask, add 5mL acetic acid solution (A), make the solution pH about 3.4, add about 5mL dehydrated alcohol, add dropwise alizarin red after mixing 11 drops of indicator (alizarin red concentration is equivalent to 0.00220%). 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 0.22%. The experimental result data is calculated according to formula (1).

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Abstract

The invention discloses a method for quantitative analysis of sulphate radical. The method for quantitative analysis of sulphate radical comprises the following steps: controlling alcohol content in a titration system to be 5-35% and controlling the pH value to be 2.0-3.7, adding 0.000491-0.003275% of an alizarin red indicator into the titration system, and titrating barium chloride solution to an end point at a speed of 0.5-3.0 drops / s. The method for quantitative analysis of sulphate radical has the advantages that 19-103mg sulphate radical can be accurately analyzed, and thus analysis accuracy is within 0.3%; and the method for quantitative analysis of sulphate radical is simple and easy to grasp, influence of interfering ion is eliminated, and measurement range of the existing sulphate radical constant analytical method is expanded, so that a new method is provided for quantitatively analyzing content of sulphate radicals, especially sulphate radical content in a complex salt system.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, in particular to a method for titrating sulfate radicals in complex salt systems. Background technique [0002] There are many kinds of sulfates in salt lakes, such as gypsum (CaSO 4 2H 2 O), Epsom salt (MgSO 4 ·7H 2 O), thenardite (Na 2 SO 4 10H 2 O) and lapis lazuli (SrSO 4 ), etc. These salt lake resources are all valuable for exploitation and utilization. Magnesium sulfate can be used to prepare high-performance, high-value-added magnesium salt functional materials. Glauber's salt is mainly used in detergent industry, pulp industry, glass manufacturing industry, dyestuff, textile industry and construction industry, etc. It is also used with Yantian carnallite to produce potassium sulfate fertilizer urgently needed in agriculture. Potassium sulfate, as the main chlorine-free potassium fertilizer, has dual fertilizer effects of potassium and sulfur elements, and the potassium fertil...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 吕鹏孙柏钟远孟瑞英李海军
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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