Equipment and method for measuring content of sulfur isotope

A technology of sulfur isotope and isotope mass spectrometer, which is applied in the field of equipment for determining sulfur isotope content, can solve the problems of poor determination accuracy of sulfur element, discount of accuracy, influence on the analysis accuracy of S isotope, etc. Simple structure and high detection accuracy

Pending Publication Date: 2021-06-29
FOOD INSPECTION CENT OF CIQ SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even the stable isotope mass spectrometer (IRMS) has a very high sensitivity, reaching the ppb level (10 -9 ), but under the interference of high content of carbon and nitrogen, the determination accuracy of such a trace amount of sulfur is still poor, and the accuracy is greatly reduced
Even for columns based on differences in retention time, due to the large amount of CO 2 The interference of gas entering the mass spectrum will also greatly affect the accuracy of S isotope analysis

Method used

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  • Equipment and method for measuring content of sulfur isotope
  • Equipment and method for measuring content of sulfur isotope
  • Equipment and method for measuring content of sulfur isotope

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Such as figure 1 As shown, the present embodiment provides a kind of equipment for measuring sulfur isotope content, including combustion furnace 1, conduit 2, colorimetric tube 3, funnel 4, oven 5 and elemental analysis-stable isotope mass spectrometer 6 (EA-IRMS) . Combustion furnace 1 is provided with combustion tube 10, and combustion tube 10 is provided with copper oxide 11 as reaction catalyst; Gas; Oxygen is used as the gas source for sample combustion, and Helium is used as the carrier gas. One end of conduit 2 communicates with the gas outlet of combustion tube 10, and the other end is arranged at least 2 centimeters below the liquid level of colorimetric tube 3; Saturated bromine water 7 (mass fraction 3.1%) is accommodated in colorimetric tube 3. A quartz fiber filter membrane 8 is arranged in the funnel 4 .

[0064] This embodiment also provides a method for determining the content of sulfur isotopes, and the sample uses rice whose origin is Pakistan; the...

Embodiment 2

[0074] The equipment used in this example for determining the sulfur isotope content is the same as in Example 1.

[0075]This embodiment also provides a method for determining the content of sulfur isotopes, and the sample uses rice from Cambodia; the method specifically includes the following steps:

[0076] a. Weigh 1 to 2 g of rice samples and wrap them in a tin cup and send them to the combustion furnace 1. Oxygen is introduced into the combustion tube 10, and the samples are burned at a temperature of 800°C under the catalysis of copper oxide to convert the sulfur in the samples. It is sulfur dioxide gas, which is brought into bromine water by helium. Among them, the flow rate of helium is 110mL / min, the flow rate of oxygen is 30mL / min, and the oxygen time is set to 70s.

[0077] B, sulfur dioxide enters the saturated bromine water in colorimetric tube 3 through conduit 2 under the action of helium, SO 2 React with bromine water, keep it until 10 seconds after the samp...

Embodiment 3

[0085] The equipment used in this example for determining the sulfur isotope content is the same as in Example 1.

[0086] This embodiment also provides a method for determining the content of sulfur isotopes, and the sample uses rice from Myanmar; the method specifically includes the following steps:

[0087] a. Weigh 1 to 2 g of rice samples and wrap them in a tin cup and send them to the combustion furnace 1. Oxygen is introduced into the combustion tube 10, and the samples are burned at a temperature of 800°C under the catalysis of copper oxide to convert the sulfur in the samples. It is sulfur dioxide gas, which is brought into bromine water by helium. Among them, the flow rate of helium is 110mL / min, the flow rate of oxygen is 30mL / min, and the oxygen time is set to 70s.

[0088] B, sulfur dioxide enters the saturated bromine water in colorimetric tube 3 through conduit 2 under the action of helium, SO 2 React with bromine water, keep it until 10 seconds after the samp...

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Abstract

The invention provides equipment and a method for measuring the content of sulfur isotopes. The equipment for measuring the content of the sulfur isotopes comprises a sample combustion device, a gas-liquid reaction device, a solid-liquid separation device and a detection device. The method for measuring the content of the sulfur isotopes is used for measuring by using the equipment for measuring the content of the sulfur isotopes and comprises the following steps: combusting a sample in the sample combustion device to obtain gaseous sulfur dioxide, then inputting the sulfur dioxide into the gas-liquid reaction device for reaction to obtain a solid-liquid mixture containing a sulfur-containing precipitate, separating by using the solid-liquid separation device to obtain the sulfur-containing precipitate, and determining the content of the sulfur isotopes 34S by using the detection device. According to the equipment and the method for measuring the content of the sulfur isotopes, the content of the sulfur isotopes in a sample with relatively low sulfur content can be measured under the condition that the sample amount is not increased.

Description

technical field [0001] The present application relates to the field of element content detection, in particular to a device and method for determining sulfur isotope content. Background technique [0002] At present, the determination of sulfur isotopes is generally carried out directly by elemental analysis-stable isotope mass spectrometer (EA-IRMS). First, the sample is burned in the elemental analyzer (EA), and the carbon element in it is converted into carbon dioxide, and the nitrogen element is converted into nitrogen dioxide. The sulfur element is converted into sulfur dioxide, and the gas products generated by combustion are all carried by the carrier gas into a stable isotope mass spectrometer (IRMS) for measurement. In the determination process of the stable isotope mass spectrometer (IRMS), the compounds of carbon, nitrogen and sulfur are firstly adsorbed when they pass through the adsorption column at the same time. The carbon, nitrogen, and sulfur compounds on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N1/28G01N30/02G01N30/06
CPCG01N27/62G01N1/28G01N30/02G01N30/06
Inventor 颜治吴浩赵旭黄科易冰清林妮林起辉陈海泉
Owner FOOD INSPECTION CENT OF CIQ SHENZHEN
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