Application method of ammonium bifluoride as geological sample digestion reagent

A technology for geological samples and ammonium bifluoride, applied in the field of chemical analysis, can solve the problems of heavy workload, complicated and time-consuming operation procedures, and achieve the effects of small workload, strong application prospect and accurate measurement.

Active Publication Date: 2013-01-02
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to purchase expensive high-pressure airtight equipment, the operation process is complex and cumbersome, the workload is heavy and time-consuming, and hydrofluoric acid, which is extremely harmful to the human body, is also required.
[0005] To sum up, the pretreatment technology for trace element testing of geological samples has not yet appeared, which can completely and effectively digest insoluble accessory minerals, ensure fast and efficient work efficiency, and is also suitable for digestion methods of instruments and equipment.

Method used

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  • Application method of ammonium bifluoride as geological sample digestion reagent
  • Application method of ammonium bifluoride as geological sample digestion reagent
  • Application method of ammonium bifluoride as geological sample digestion reagent

Examples

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Embodiment 1

[0035] The present invention provides a kind of application method of ammonium bifluoride as the digestion reagent of geological sample, and it comprises the following steps:

[0036] 1) Physically pulverize the granite (GSR-1) sample to 200 mesh (sieve: 0.074 mm) to obtain a powder test sample;

[0037] 2) Weigh 250 mg of ammonium bifluoride and 50±1 mg of granite (GSR-1) sample powder, place them in a clean PFA sample dissolving bottle, tighten the PFA sample dissolving bottle, shake it manually for 30 seconds, and put it into an electronic oven. The temperature is set to 230°C, and the time is set to 3 hours;

[0038] 3) After the time is up, wait for the PFA sample dissolving bottle to cool down. At this time, the geological sample in the PFA sample dissolving bottle and ammonium bifluoride form a solid cake mixture. Take the PFA sample dissolving bottle out and place it on the electric heating plate, add 3 ml of nitric acid, and the electric heating plate Set the tempera...

Embodiment 2

[0042] Embodiment 2 is substantially the same as Embodiment 1, except that the geological sample selected in this embodiment is granite (G-2). The test results are shown in Table 1.

Embodiment 3

[0044] The present invention provides a kind of application method of ammonium bifluoride as the digestion reagent of geological sample, and it comprises the following steps:

[0045] 1) Physically pulverize the shale (GSR-5) sample to 200 mesh (sieve: 0.074 mm) to obtain a powder test sample;

[0046] 2) Weigh 200 mg of ammonium bifluoride and 50±1 mg of shale (GSR-5) sample powder, place them in a clean Teflon sample dissolving bottle, tighten the Teflon sample dissolving bottle, shake it manually for 30 seconds, and then heat it with a microwave. The temperature is set to 220°C, and the time is set to 4 hours;

[0047]3) After the time is up, wait for the Teflon sample dissolving bottle to cool down. At this time, the geological sample in the Teflon sample dissolving bottle and ammonium bifluoride form a solid cake mixture. Take the Teflon sample dissolving bottle out and place it on the electric heating plate, add 2 ml of nitric acid, and heat it Set the plate temperature...

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Abstract

The invention provides a pretreatment method for applying ammonium bifluoride to digest a geological sample. The method comprises the steps that: (1) ammonium bifluoride and the geological sample are weighed according to a ratio that ammonium bifluoride to the geological sample is 4-6:1; the materials are placed in a sample dissolving bottle; the bottle is shaken and then is heated for 3-5h under a temperature of 220-240 DEG C; (2) the sample dissolving bottle is cooled to room temperature; acid is added into the sample dissolving bottle; and silicon is removed by heating; and (3) when silicon is completely removed, acid and water are added into the sample dissolving bottle; and the bottle is heated, such that solid-state residues in the sample dissolving bottle is completely dissolved. The method provided by the invention has the advantages of high efficiency, good safety, low cost, good flexibility, and low workload. The method is an important innovation of geological sample digestion methods, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, and in particular relates to an application method of ammonium bifluoride as a digestion reagent for geological samples. Background technique [0002] The trace element content and isotopic ratios of substances such as rocks, minerals or soils have important geological significance. At present, in the field of geochemistry, inductively coupled plasma mass spectrometry or thermal ionization mass spectrometry is mainly used to obtain the trace element content and isotope ratio in geological samples. Geological samples require special chemical treatments for pretreatment before using instruments for analytical testing. [0003] The existing geological sample pretreatment techniques can be divided into alkali fusion method and acid digestion method. Among them, the alkali fusion method is not suitable for inductively coupled plasma mass spectrometers due to the addition of a large amount ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44
Inventor 胡兆初张文刘勇胜陈海红高山
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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