Unlock instant, AI-driven research and patent intelligence for your innovation.

Measuring method of content of sodium in ammonium paratungstate

A technology of ammonium paratungstate and determination method, which is applied in the field of analytical chemistry, can solve problems such as instability, blank test differences, and secondary pollution, and achieve the effects of reducing detection costs, low reagent blanks, and improving accuracy

Inactive Publication Date: 2017-04-19
JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP HLDG CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because there is no requirement for sodium content in the production control index of reagent citric acid, the sodium content in citric acid is often high, and the sodium content in each batch of citric acid produced is inconsistent, so that the sodium content in the blank test is high and inconsistent. Stable; at the same time, the addition of ammonia water will also cause a large difference in the blank test due to the inconsistent sodium ammonia content of each batch
However, the sodium content in ammonium paratungstate is very low, generally lower than 0.0005%, and the national standard zero-grade product requires sodium to be lower than 0.0010%, so the requirements for the reagent blank test are very high. If the reagent blank test is high and unstable, it will be necessary for the determination The results have a great impact, making the test results poorly reproducible, and even making the measurement impossible
At the same time, it is also easy to cause secondary pollution when transferring from a quartz beaker or a plastic king beaker to a volumetric flask, resulting in a high sodium content in the test result.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Measuring method of content of sodium in ammonium paratungstate
  • Measuring method of content of sodium in ammonium paratungstate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh about 1 gram of sample into a 100 mL quartz steel measuring bottle, add 60 mL of deionized water, heat on an electric furnace until the sample is completely dissolved, remove it, cool it, and add 1 mL of cesium chloride solution with a concentration of 20 g / L to Dilute to volume with deionized water and shake well. On the atomic absorption spectrometer, at the wavelength of 589.0nm, according to the selected conditions, use the air-acetylene flame, adjust to zero with water, measure the absorbance value of the test solution, and find out the corresponding sodium content from the working curve. Calculate the analysis results. At the same time do a blank test.

Embodiment 2

[0018] Weigh about 0.5g of sample into a 100mL quartz steel measuring bottle, add 50mL of deionized water, heat on a hot plate until the sample is completely dissolved, remove it, cool it, and add 0.5mL of cesium chloride solution with a concentration of 20g / L , make up to volume with deionized water, and shake well. On the atomic absorption spectrometer, at the wavelength of 589.0nm, according to the selected conditions, use the air-acetylene flame, adjust to zero with water, measure the absorbance value of the test solution, and find out the corresponding sodium content from the working curve. Calculate the analysis results. At the same time do a blank test.

[0019] The embodiment of the present invention tests 3 samples, and each sample is measured 6 times. At the same time, it is measured according to the national standard method (GB / T4324.17-2012, GB / T4324.17-84), and different batches of lemons are used each time. Acid and ammonia water, the analysis results are shown...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a measuring method of the content of sodium in ammonium paratungstate. According to the measuring method, a sample is weighed in a quartz steel measuring flask directly, and is dissolved with water, cesium chloride is taken as a deionization agent, and an obtained solution is diluted with water to a constant volume. The measuring method comprises following specific steps: 0.2 to 1g of an ammonium paratungstate sample is accurately weighed in the quartz steel measuring flask, 30 to 70ml of water is added, heating dissolving is carried, after cooling, 0.5 to 2ml of a cesium chloride solution with a concentration of 20g / L is added, an obtained mixture is diluted with water directly so as to obtain a ammonium paratungstate solution, and atomic absorption spectrometry is adopted to measure the content of sodium in the ammonium paratungstate solution, wherein measuring wave length is controlled to be 589.0nm, and air-acetylene flame is adopted. The measuring method is simple, convenient, accurate, and stable, is low in cost, and is capable of realizing direct dilution to a constant volume and measuring, and avoiding problems in the prior art that dissolving of the sample with ammonium hydroxide and complexing of tungsten with citric acid are needed, after dissolving the sample is delivered into a volumetric flask for dilution to a constant volume, reagent blank test sodium content is high and unstable, contamination is easily caused in transferring process, many reagents are used, and cost is high.

Description

technical field [0001] The invention relates to an analysis and detection method of sodium element, in particular to an analysis and detection method of sodium content in ammonium paratungstate, and specifically belongs to the technical field of analytical chemistry. Background technique [0002] The determination of sodium in ammonium paratungstate is mainly carried out by flame atomic absorption spectrometry (FAAS), and inductively coupled plasma spectrometry (ICP-AES) has also been reported. Generally speaking, the FAAS method is more sensitive than the ICP-AES method for the determination of sodium, and the detection limit is lower. At the same time, the ICP instrument is expensive and the detection cost is high. Therefore, the determination of sodium in ammonium paratungstate is basically performed by flame atomic absorption spectrometry (FAAS). ). Existing method all is that test material is weighed in quartz beaker or plastic king beaker, adds ammoniacal liquor when ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/3103
Inventor 彭玲
Owner JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP HLDG CO LTD