Pretreatment method for detecting boron impurities of sodium metasilicate

A sodium metasilicate and boron impurity technology, which is applied in the field of sodium metasilicate impurity detection and pretreatment, can solve the problems of serious matrix effect, affecting the detection accuracy of boron impurities, and contamination of the sampling system, so as to weaken the influence of the matrix effect , Improve the detection accuracy, and the enrichment effect is obvious

Active Publication Date: 2013-11-27
DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium metasilicate is easily soluble in water, and its aqueous solution can be directly detected, but the existence of a large amount of sodium ions and silicate ions leads to serious matrix effect, which greatly affects the detection accuracy of boron impurities, and seriously pollutes the sampling system. This field is still blank

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 0.5g sodium metasilicate sample into PTEE beaker;

[0024] (2) Add NaOH solution with a concentration of 5wt% to the beaker to completely dissolve the sodium metasilicate sample, and then add water to adjust the pH of the solution to 9.0;

[0025] (3) Measure 1ml of mannitol solution with a concentration of 1wt%, add it to a beaker, and use ultrasonic vibration for 3 minutes, then let it stand for 5 minutes;

[0026] (4) Pour the solution in the beaker into the pp separating funnel, wash the beaker twice, and put the washing liquid in the pp separating funnel;

[0027] (5) Add 4ml of high-grade pure diethyl ether into the separatory funnel, shake it manually for 3 minutes, and let it stand for 5 minutes to form layers, then take out the diethyl ether phase and place it in a beaker;

[0028] (6) Repeat step (5) twice, collect all the ether phase in a beaker, place the beaker in a water bath at 28°C, and heat until the ether evaporates completely;

[0029] (7) A...

Embodiment 2

[0031] (1) Add 1.0g sodium metasilicate sample into PTEE beaker;

[0032] (2) Add NaOH solution with a concentration of 5wt% to the beaker to completely dissolve the sodium metasilicate sample, and then add water to adjust the pH value of the solution to 8.0;

[0033] (3) Measure 2ml of mannitol solution with a concentration of 1wt%, add it to a beaker, oscillate ultrasonically for 5 minutes, and then let it stand for 10 minutes;

[0034] (4) Pour the solution in the beaker into the pp separating funnel, wash the beaker 3 times, and put the washing liquid in the pp separating funnel;

[0035] (5) Add 5ml of high-grade pure diethyl ether into the separatory funnel, shake it artificially for 5 minutes, and let it stand for 10 minutes to form layers, then take out the diethyl ether phase and place it in a beaker;

[0036] (6) Repeat step (5) 3 times, collect all the ether phase in a beaker, place the beaker in a 30°C water bath, and heat until the ether evaporates completely;

...

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Abstract

The invention relates to a sodium metasilicate impurity detection pretreatment method, in particular to a pretreatment method for detecting boron impurities of sodium metasilicate, which comprises the following steps: adding sodium metasilicate samples into the NaOH solution for dissolution, adding water and adjusting the pH value, then adding mannitol, enabling the mannitol and the boron impurities of sodium metasilicate to be subjected to complexation fully, performing extraction through diethyl ether, heating the extracted diethyl ether till full volatilization, adding nitric acid into residual liquid and adding water for constant volume, and finally performing detection. The method has the advantages as follows: (1) the gathering function of boron is obvious, and few sodium ions and silicate ions exist in the solution to be detected, so that the influence of the matrix effect is greatly reduced, the recovery of the boron can be improved to more than 95 % from 80-82 %, and the method detection limit of the boron is reduced to 0.2 ppm from 1 ppm; (2), the pollution to the sampling system is avoided; (3), the method is simple and easy to operate, and improves the detection accuracy.

Description

technical field [0001] The invention relates to a pretreatment method for detecting impurities in sodium metasilicate, in particular to a pretreatment method for detecting boron impurities in sodium metasilicate. Background technique [0002] At present, my country has become the world's largest energy production and consumption country, but the per capita energy consumption level is still very low. With the continuous development of the economy and society, my country's energy demand will continue to grow. In response to the current energy shortage, countries around the world are thinking deeply, and are working hard to improve energy efficiency, promote the development and application of renewable energy, and reduce the impact on energy consumption. Reliance on imported oil to enhance energy security. [0003] As one of the important development directions of renewable energy, solar photovoltaic power generation has developed rapidly in recent years, and its proportion is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/40G01N1/34
Inventor 谭毅刘瑶刘鑫业
Owner DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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