Rapid pretreatment method for measuring carbon isotopes in water and sampling device

A carbon isotope, rapid technology, applied in the preparation of test samples, etc., can solve the problem of time-consuming and other problems, and achieve the effect of less material, convenient operation and easy operation

Pending Publication Date: 2021-02-26
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is time-consuming to operate, and a set of simple pre-treatment devices and methods are particularly needed to carry out pre-treatment

Method used

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  • Rapid pretreatment method for measuring carbon isotopes in water and sampling device
  • Rapid pretreatment method for measuring carbon isotopes in water and sampling device
  • Rapid pretreatment method for measuring carbon isotopes in water and sampling device

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Experimental program
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Effect test

Embodiment 1

[0059] According to the rapid pretreatment method for measuring carbon isotopes in water described in the application, it may further comprise the steps:

[0060] (1) Preparation of Ba(OH) 2 Saturated solution: add 80mL deionized water to 100mL glass bottle 11, then add 5g Ba(OH) 2 ·8H 2 O, making saturated Ba(OH) 2 Solution, for subsequent use; choose the round-bottomed glass bottle 13 with a volume of 5mL as a reaction bottle, put it in a flushing bag 12 full of argon with a volume of 5L, put the argon gas guide tube 15 into the round-bottomed glass bottle 13, and use Rinse the inside of the bottle with argon gas 3 times, seal it with a screw cap 14 with a silica gel septum, then evacuate the round bottom glass bottle 13 to below 200Pa, then use the first syringe 16 of 5mL specification (cleaned 3 times with argon gas before use) ) absorb the saturated Ba(OH) in the glass bottle 11 2 2 mL of the solution was poured into the round bottom glass bottle 13.

[0061] (2) Put...

Embodiment 2

[0065] About BaCO 3 Screening of the mass ratio of solid powder to Ta powder:

[0066] Prepare BaCO by the method of embodiment 1 3 solid powder. Take BaCO 3 Solid powder and 325 mesh Ta powder (purity is 99.9%), divide into 4 parts respectively, BaCO 3 Put the solid powder and Ta powder into the glass test tube according to the mass ratio of 1:0.5, 1:1, 1:2, 1:3 respectively, mix evenly with a glass rod, and then add the evenly mixed powder to the center hole of the copper target In the process of crushing and compacting, the pretreatment is completed. On the accelerator mass spectrometer of 5MV, the cesium ion beam bombards the mixed powder in the center hole of the copper target, so that the powder in the powder 12 C is charged to become 12 C 3+ , it was found experimentally that BaCO 3 When the mass ratio of solid powder and Ta powder is 1:(1~2) 12 C 3+ The highest current value generated (see Figure 4 ), that is, Ta has the highest efficiency in the measurement...

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Abstract

The invention relates to a rapid pretreatment method and a sampling device for measuring carbon isotopes in water in the field of carbon isotope measurement. The method comprises the following steps:(1) sealing a reaction bottle by using a cover with a silica gel diaphragm, vacuumizing the reaction bottle, and injecting a Ba(OH)2 saturated solution into the bottle; (2) filling the sampling bag with underground water for sampling, and sealing the sampling bag in the water; (3) injecting the acid solution into a sampling bag, wherein gas generated in the bag overflows to the upper part of the sampling bag, extracting gas generated in the sampling bag, and injecting the gas into a reaction bottle to generate precipitate; (4) freezing the reaction bottle to freeze the precipitate, freeze-drying the precipitate to obtain solid powder, mixing the solid powder with Ta powder, and adding the mixture into a copper target for testing. According to the sampling method, contact with air can be effectively avoided in the sampling process, so that the rapidity and accuracy of extracting a small amount of carbon isotope samples from water are improved, and the sampling method is suitable for detecting carbon isotopes by adopting an accelerator mass spectrometer.

Description

technical field [0001] The invention relates to the field of carbon isotope measurement, and more particularly, relates to a rapid pretreatment method and a sampling device for measuring carbon isotope in water. Background technique [0002] Inorganic carbon in water as CO 2 、HCO 3 、H 2 CO 3 , CO 3 form exists, 14 C is a radioactive isotope of carbon, measuring its activity in groundwater can determine the age of groundwater. current measurement 14 The instrument of C is an accelerator mass spectrometer, which requires a small amount of sample, and the mass of C required is 1-5mg. However, in the process of pretreatment, water samples are still taken from the field to convert inorganic carbon in water into CO 2 , using a cobalt catalyst for hydrogen reduction, making a graphite target and putting it into an AMS instrument to complete the test. This method is relatively time-consuming to operate, and a set of simple pretreatment device and method are particularly need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/34
CPCG01N1/28G01N1/34
Inventor 杨丽虎
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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