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A quantitative detection method, isotope dilution technology, applied in the field of analysis and testing
Active Publication Date: 2018-11-16
NORTHWEST INST OF NUCLEAR TECH
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[0021] The purpose of the present invention is to solve the problem that additional measurement steps are required to accurately measure the content of various isotopes derived from artificial additives under the condition that the isotope ratio of the sample to be tested after adding artificial additives to the original sample is affected. A quantitative detection method of isotope dilution, this method is suitable for the quantitative test of isotope dilution method with multiple isotopes, under the condition of pre-calibrating relevant parameters, after obtaining the sample, it only needs a single measurement to determine the content of multiple isotopes in artificial additives ; Of course, if necessary, the content of other various isotopes in the sample can also be determined
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Embodiment 1
[0115] For example, to test for bioabsorption effects, use 147 Sm acts as an isotopic tracer, while small amounts of natural Sm exist in the environment, which contain 147 Sm, 148 Sm, 149 Sm, 150 Sm, 152 Sm, 154 Sm and other isotopes of natural abundance, the isotope to be measured is the isotope from the added tracer in the sample. 147 Sm.
[0116] The three isotopes A, B, and C correspond to 150 Sm, 147 Sm, 152 Sm, select 152 Sm is the representative isotope of natural Sm.
[0117] According to the conventional isotope dilution method, because the sample 147 The abundance of Sm is not a natural abundance and is an unknown quantity, so the abundance test of the sample must be performed. In order to omit the sample abundance test step, the following steps are used to measure:
[0118] 1) Select 150 Sm is used as an isotope diluent, and its addition amount is accurately calibrated, and it is determined when the isotope diluent is calibrated. 150 Sm with 147 Sm, ...
Embodiment 2
[0125] In Example 1, if added in the experiment 147 Sm isotope tracer, containing 1% 150 Sm (i.e. the tracer contains an isotope of the element Sm 147 Sm and isotopes 150 Sm), other parameters are the same as above. then in R 147X On the basis that 1% is known, the measurement conditions and content are the same as those in Example 1. According to formulas (14), (15) and (16), it is still only necessary to measure once, and it is possible to simultaneously give the indications derived from the addition of the sample in the sample. tracer 150 Sm, 147 The amount of the two isotopes of Sm.
[0126]
[0127]
[0128] in:
[0129]
Embodiment 3
[0131] In Example 1, if the experiment also added 149 Sm isotope tracer (i.e., use the isotope with undisturbed abundance 149 Sm instead 150 Sm), then only need to add in calibration and subsequent measurements 149 The measurement of Sm ion current still only needs one measurement, which can simultaneously give the tracer added in the sample. 147 Sm, 149 The amount of the two isotopes of Sm, 147 The amount of Sm has been given in Example 1, 149 The amount of the Sm isotope is represented by the following formula.
[0132]
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Abstract
Relating to the analytical test field, the invention provides an isotope dilution quantitative detection method directed at the problem of needing an additional measurement step under the condition ofan affected to-be-detected sample's isotope ratio after adding an artificial additive to an original sample. The method is used for measuring the content of isotope B derived from an artificial additive in a to-be-detected sample, which is a mixture obtained by adding the artificial additive to the original sample, wherein the element X in the original sample at least contains isotopes A, B and C; the artificial additive contains the isotope B of element X and does not contain isotope A and isotope C. The method includes the steps of: 1) selecting a concentrated sample of isotope A as the isotope diluent, and calibrating RBD, RCD and the adding amount ND of the isotope diluent; (2) adding the isotope diluent into the to-be-detected sample, and mixing the isotope diluent with the to-be-detected sample uniformly; (3) measuring RBM and RCM; and (4) calculating the atomic number of the isotope B derived from the artificial additive in the to-be-detected sample through a formula.
Description
technical field [0001] The invention relates to the technical field of analysis and testing, in particular to an isotope dilution quantitative detection method. Background technique [0002] The isotope dilution method is a quantitative analysis method recognized as traceable. It is assumed that an element in the sample has two isotopes A and B. By adding isotope diluents with a large difference in abundance from A and B in the sample, the mixed isotope diluent is measured. The abundance ratio can be used to calculate the content of isotopes A and B in the sample. [0003] Assuming that the content of isotope B in the sample is higher than that of isotope A (the content of B may also be lower), the concentrated sample of isotope A is selected as the isotope diluent, and the content of other isotopes (impurities) other than A in the isotope diluent is usually less than 1 %, that is, the content of A in the isotope diluent is much higher than that of B; in general, the lower ...
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