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Offline pretreatment device and method for simply measuring oxygen stable isotope ratio in water

A technology for stable isotope and water determination, which is used in measurement devices, material separation, instruments, etc., can solve the problems of small sample volume, difference in measurement results, and small reactor capacity, and achieves low cost, simple operation, and guaranteed determination. The effect of precision

Active Publication Date: 2013-03-13
CHINA NAT RES INST OF FOOD & FERMENTATION IND CO LTD
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  • Abstract
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AI Technical Summary

Benefits of technology

This technology described in this patented relates to an improved apparatus called OffLine Previous Preparedness Apparatus(OPA) that helps scientists perform measurements accurately at home instead of having them take their samples outside. Unlike traditional methods like Gas Chrometer Drying Methods (GC), these OPAs don't require any extra steps nor specific tools needed during testing. They work well even when there aren’t enough spare parts available within reasonable time frames. Overall, they offer technical benefits such as reduced costs over existing systems, simplified operations, lower prices, ease of handling, flexibility, and ability to measure different types of substances from various sources simultaneously.

Problems solved by technology

Technological Problem addressed in this patents relates to improving the accuracy and reliability of detecting specific chemical species like nitrogen or chlorine in aquatic environments. Current techniques have limitations including complex operations requiring highly skilled operators, limited space availability, and poor reproducibility due to factors like temperature fluctuations over time. Therefore there remains room for improvement in these existing technologies.

Method used

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  • Offline pretreatment device and method for simply measuring oxygen stable isotope ratio in water
  • Offline pretreatment device and method for simply measuring oxygen stable isotope ratio in water
  • Offline pretreatment device and method for simply measuring oxygen stable isotope ratio in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Combine now figure 1 , figure 2 and image 3 Describe the working process of the device and the analysis and measurement method.

[0045] 1. Add about 4mL of water sample to the reaction bottle (7), and cover it tightly with the cap (with Teflon gasket);

[0046] 2. Connect the reaction bottle (7) to the capillary stainless steel tube (6), open the valve of the carbon dioxide cylinder (1), open the pressure reducing valve (2), and replace the air in the reaction bottle with the upward exhaust method (such as figure 2 ), after 15 minutes, unplug the capillary stainless steel tube (6) from the reaction bottle (7);

[0047] 3. Put the reaction bottle in a water bath at 25±0.2°C, shake it for 10 hours and take it out;

[0048] 4. Set gas chromatography parameters: inlet temperature 100°C, column temperature 100°C, constant flow rate 1.2mL / min;

[0049] 5. Use a gas sampling needle to collect the gas in the reaction bottle (continuous collection by an automatic sample...

Embodiment 2

[0051] According to the method in Example 1, take a certain water sample as the experimental object, process and measure the δ in the water continuously 18 O(n=3), the results are shown in Table 1

[0052] Table 1 Repeated determination of a water sample δ 18 Result of O (‰)

[0053]

[0054] In this example, it has been verified that offline pretreatment device and assay method in the present invention measure δ in water 18 The repeatability of O, as can be seen from Table 1, the 1σ of the present invention is only 0.075‰, which is less than the international standard for water δ 18 Determination requirements of O (0.2‰)

Embodiment 3

[0056] With 4 known δ 18 The water samples of O (see Table 2) were the experimental objects, and the four samples were measured according to the method in Example 1, and the results are shown in Table 2.

[0057] Table 24 kinds of water samples δ 18 o

[0058]

[0059] As can be seen from Table 2, although there is a certain deviation between the measured result and the known value, the analysis data can find that the two are in a good linear relationship, see Figure 4 .

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Abstract

The invention relates to an offline pretreatment device and an offline pretreatment method for simply measuring an oxygen stable isotope ratio in water. The device comprises a carbon dioxide inflation system, a reaction kettle and a constant-temperature oscillation water bath box, wherein the carbon dioxide inflation system comprises a carbon dioxide steel bottle, a pressure reducing valve, a gas inlet branch tube, a rubber pipe and capillary tubes, wherein the pressure reducing valve is connected with the carbon dioxide steel bottle; the gas inlet branch tube is connected with the pressure reducing valve by a connecting guide tube; the rubber tube is connected on the gas inlet branch tube; and the capillary tubes are arranged on the tail end of the rubber tube; one or more, preferably two or more capillary tubes are connected at a sampling branch tube, so that one or more, preferably two or more reaction bottles are connected with the capillary tubes. The method combines an offline pretreatment technology and a gas chromatography-stable isotope ratio mass spectrometer (GC-IRMS) coupling technique, so that precision and accuracy can be ensured. Moreover, the cost is low, a using range of the GC-IRMS is expanded, and using efficiency of the GC-IRMS is improved.

Description

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Claims

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Application Information

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Owner CHINA NAT RES INST OF FOOD & FERMENTATION IND CO LTD
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