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Method for highly precisely measuring Sr/Ca ratio of carbonate rock by using plasma emission spectrometer

A carbonate rock and plasma technology, applied in thermal excitation analysis, material excitation analysis, etc., to achieve high precision, save experimental cost, and fast test speed

Active Publication Date: 2018-07-17
SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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AI Technical Summary

Benefits of technology

This technology allows us to accurately determine both calcium (Sr) and strontium levels from dentine samples while maintaining their stability over several months or even longer at temperatures up to 40°C without requiring costly equipment that requires regular cleanings during use. It achieves this by measuring multiple samples simultaneously on different instruments under specific environmental factors like lightning current, wind pressure, humidity, etc., resulting in faster testing times compared to previous methods.

Problems solved by technology

This patented problem addressed in this patents relates to improving the accuracy of measuring rare earth metabolites in fossil hydrocarbon deposits like those found at depth within 100 meters over vast regions called seafloor waters. Current tools have limitations due to their low resolution capabilities and lack of sufficient temporal range for accurate prediction purposes.

Method used

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  • Method for highly precisely measuring Sr/Ca ratio of carbonate rock by using plasma emission spectrometer
  • Method for highly precisely measuring Sr/Ca ratio of carbonate rock by using plasma emission spectrometer
  • Method for highly precisely measuring Sr/Ca ratio of carbonate rock by using plasma emission spectrometer

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: for low latitude tropical sea area

[0025] 1. Preparation of four standard solutions

[0026] 1. Standard solution of Sr and Ca elements: Accurately weigh Sr and Ca on an electronic balance of 1 / 10,000 (accuracy 0.1mg), then take an appropriate amount and dissolve it in 2% HNO 3 In the solution, configure a mixed standard solution for determining the Sr / Ca ratio (for coral, Sr / Ca ratio=8.7), and mark it as "standard A".

[0027] 2. On the ten-thousandth balance, use 2% HNO 3 Accurately dilute "Standard A", configure three standard solutions with [Ca] of 25ppm, 35ppm and 45ppm respectively, and mark them as "Standard B-1", "Standard B-2" and "Standard B-3"; Sr / Ca The ratio remains unchanged, which is equivalent to "mark A".

[0028] 3. Grind a piece of clean coral into powder, and the grinding must be very uniform. Use 2% HNO on electronic balance 3 Accurately dissolve and dilute to 10000 times (that is, the mass fraction of coral powder in the soluti...

Embodiment 2

[0038] Example 2: for relatively high latitude tropical seas

[0039] 1. Preparation of four standard solutions

[0040] 1. Single-standard solution of Sr and Ca elements: Accurately weigh Sr and Ca on an electronic balance of 1 / 10,000 (accuracy 0.1mg), and then take an appropriate amount and dissolve it in 2% HNO 3 In the solution, configure a mixed standard solution for determining the Sr / Ca ratio (for coral, Sr / Ca ratio=8.7), and mark it as "standard A".

[0041] 2. On the ten-thousandth balance, use 2% HNO 3 Precisely dilute "Standard A", prepare three standard solutions with [Ca] of 25ppm, 35ppm and 45ppm respectively, and mark them as "Standard B-1", "Standard B-2" and "Standard B-3".

[0042] 3. Grind a piece of clean coral into powder, and the grinding must be very uniform. Use 2% HNO on electronic balance 3 Accurately dissolve and dilute to 10000 times, label and store, as a standard sample for long-term monitoring and correcting instrument stability, marked as "l...

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Abstract

The invention discloses a method for highly precisely measuring a carbonate rock ratio by using a plasma emission spectrometer. The method can be applied to the field of paleoclimatological research on terrestrial and marine carbonate media. The method comprises the following steps: cleaning a carbonate rock sample, preparing a sample solution, preparing four standard sample solutions, determiningthe testing sequence of the sample applied to the plasma emission spectrometer, and processing test data. By the method, long-term stable and accurate Sr/Ca data can be measured, so that a paleoclimate record which is comparable to that in an ultra-clean laboratory and is even preciser than that in the ultra-clean laboratory can be obtained; and excellent test precision can be fully qualified inpaleoclimate reconstruction in a low-latitude tropical sea area.

Description

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Claims

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Application Information

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Owner SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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