A device and method for online testing of ferrous iron and total iron content in a sample

A technology for ferrous iron and iron content, applied in the preparation of test samples, measuring devices, color/spectral characteristics measurement, etc., can solve the problems of unsatisfactory accuracy, complicated detection methods, and long detection cycle, etc., and achieve reduction Labor intensity, reduce the risk of being oxidized, and save labor

Inactive Publication Date: 2021-01-22
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] In order to solve the shortcomings of the current detection methods for testing the content of ferrous iron in geological samples, which are complicated, the detection cycle is long, and it is easy to oxidize during the test process, the accuracy cannot meet the requirements.

Method used

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  • A device and method for online testing of ferrous iron and total iron content in a sample
  • A device and method for online testing of ferrous iron and total iron content in a sample
  • A device and method for online testing of ferrous iron and total iron content in a sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Digestion and constant volume: Accurately weigh 2-8 mg of standard geological sample JB-1a and place it in the Teflon sample dissolving tank, tighten the screw cap, and connect the vent hole to the Shrek vacuum line; plug the cap tightly, and then vacuumize first , and then introduce argon, repeat the operation three times; open the lid, add sulfuric acid (9mol / L) 0.6mL, hydrofluoric acid 0.4mL with a pipette gun in the argon flow; heat and digest on the electric heating plate for 6 minutes; digestion is complete Finally, add 4.0 mL of saturated boric acid in the argon flow; add 95.0 mL of high-purity water in the argon flow to make constant volume;

[0068] Test: The sample solution after constant volume is directly introduced into the flow injection analyzer for analysis; the specific operation is that the sample solution enters the flow injection analyzer through No. 1 sample pipe. At the same time, reducing agent or water (when analyzing total iron, the liquid used ...

Embodiment 2

[0074] The other steps are the same as in Example 1, except that the rock standard material JG-1a is used, ferrozine is used as the chromogen, and the sample solution after constant volume is directly introduced into the flow injection analyzer for analysis. The number of measurements is 5 times. Utilize above-mentioned determination method to the comparison of the measured value and standard value of ferrous iron and total iron in the international standard substance JG-1a as shown in table 2:

[0075] Table 2

[0076]

Embodiment 3

[0078] Other steps are the same as in Example 1, except that the rock standard material JR-2 is used, and the sample solution after constant volume is directly introduced into a flow injection analyzer for analysis. The number of measurements is 5 times. Utilize above-mentioned determination method to the comparison of the measured value and standard value of ferrous iron and total iron in international standard substance JG-1a as shown in table 3:

[0079] table 3

[0080]

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Abstract

The invention provides equipment for online testing the contents of ferrous iron and total iron in a sample and a using method. The equipment comprises the following components: a digestion tank provided with a digestion electric heating plate, a peristaltic pump, an automatic sample injector and a flow injection analyzer, the digestion tank is connected with a Schlenk vacuum line and is used forintroducing inert gas; the automatic sample injector injects a sample into the flow injection analyzer through the peristaltic pump, and the flow injection analyzer is integrated with a luminosity analyzer and is provided with a pipeline connected with a reducing agent / high-purity water, a buffer solution, a color developing agent and a waste liquid. The method comprises the following steps: digesting and fixing the volume of the sample in digestion equipment under the protection of inert gas, then mixing with the color developing agent in the flow injection analyzer, detecting through a photometric instrument integrated in the flow injection analyzer, and testing divalent iron and total iron in a sample solution. The analysis and test time is greatly shortened, the labor is saved, and thedetection precision and accuracy are improved.

Description

technical field [0001] The invention belongs to the field of geochemistry, in particular to a method for accurately analyzing divalent iron and total iron in rock samples by flow injection. Background technique [0002] Determining the different valence states of iron in rock minerals is of great significance in geology. The valence combination of iron in rock minerals and the ratio of its oxidation state to its reduction state are important indicators, which can be used to calculate the oxygen fugacity. Oxygen fugacity controls the mineral assemblage in mantle minerals and is closely related to mineralization and scale. ; It can also trace changes in paleoclimate, reflect the environmental conditions of geological processes, paleoenvironmental evolution, etc. In short, the content of different forms of iron is an important parameter in geoscience research, and the accurate quantification of iron elements in different valence states is of great significance in geology. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/78G01N21/01G01N35/08G01N1/44
CPCG01N1/44G01N21/01G01N21/31G01N21/78G01N35/085G01N2021/0112
Inventor 薛丁帅苏本勋张丹萍刘艳红
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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