Cd/Pb Isotope Source Analysis for Fractionated Soil Pollution

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Solution Overview

Problem

Existing methods for analyzing Cd/Pb pollution in soil lack accuracy and efficiency in identifying and quantifying pollution sources due to isotopic fractionation and complex environmental media, necessitating a more precise and quantitative approach.

Innovation Solution

A method and system utilizing bimetallic isotopes of Cd and Pb to analyze pollution sources by collecting samples, determining isotope ratios, plotting these ratios, recognizing pollution end-members, and calculating contribution rates through a projection plot and calculation formulas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional methods (factor analysis, principal component analysis, chemical mass balance) are used to analyze pollution sources, then qualitative analysis of pollution sources can be achieved, but the workload increases and quantitative accuracy decreases due to complex mathematical analysis and difficulty in distinguishing multicomponent systems

Engineering Contradiction:

Improvequantitative accuracy of pollution source identificationVSAvoidcomplexity of mathematical analysis and sample collection

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts and utilizes the unique isotopic fingerprint characteristics of Cd and Pb metals from complex pollution sources. By focusing specifically on isotopic composition ratios rather than attempting to analyze all chemical components simultaneously, the method simplifies the analytical approach while maintaining high quantitative accuracy in identifying pollution sources

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses isotopic composition as a natural 'fingerprint' or 'tag' for different pollution sources, similar to using distinctive markers. Each pollution source has a unique isotopic signature that can be detected and traced, enabling accurate source identification without complex mathematical deconvolution of mixed signals

Inventive Principle:

Principle #32Color changes

2Measurement precision

If single metal isotope analysis is used to trace pollution sources, then the source can be preliminarily identified, but geochemical processes (adsorption, dissolution, redox reactions, biological processes) cause isotopic fractionation that blurs the signal and reduces analysis accuracy

Engineering Contradiction:

Improveaccuracy of pollution source analysisVSAvoidisotopic fractionation from geochemical processes

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent employs a composite isotopic fingerprinting approach by simultaneously analyzing isotopic compositions of both Cd and Pb metals together. This bimetallic combined analysis creates a more robust fingerprint system where the complementary isotopic signatures of two metals work together to overcome the signal blurring caused by isotopic fractionation in single-metal analysis

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent transitions from single-metal isotope analysis to bimetallic combined isotope analysis, adding another dimensional layer of information. By plotting Cd isotope ratios against Pb isotope ratios in a two-dimensional space, the method creates a more distinctive fingerprint that maintains accuracy even when individual isotope signals are blurred by geochemical fractionation processes

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Accurately identifies and quantifies pollution end-members and their contribution rates in farmland soil, enhancing traceability and accuracy compared to traditional methods.

Implementation Method 1

determined by a multi-collector inductively coupled plasma mass spectrometer

Methodology Applied

Scientific EffectMass spectrometry:

Data Source

PatentUS20250244306A1Method and System for Analyzing Bimetallic Isotope Source of Cd/Pb Composite Pollution in Soil

Publication Date: 2025.07.31 INST OF GEOCHEMISTRY CHINESE ACAD OF SCI

AI summary

The present invention discloses a method for analyzing sources of Cd/Pb combined polluted farmland soil using bimetallic isotopes (Cd—Pb), comprising the following steps: collecting respectively a soil sample and risk source samples through a sample collection device; determining respectively Cd isotope ratio and Pb isotope ratio of the soil sample and the risk source samples; plotting by using the Cd isotope ratio and the Pb isotope ratio of the soil sample and the risk source samples as coordinates, to obtain a projection plot of the isotope ratios; recognizing a pollution end-member polluting farmland soil through the projection plot of the isotope ratios to obtain a recognition result for the pollution end-member, and then confirming the pollution end-member; and calculating a relative contribution rate of the pollution end-member, to obtain an analysis result for the source of isotopes. The present invention uses the two metal isotopes of Cd—Pb to mutually restrict and confirm each other to solve the problem of poor analytical accuracy caused by similar or overlapping isotope values of samples and isotope fractionation, and realizes accurate recognition and quantitative analysis for the source of heavy metals Cd/Pb pollution of farmland soil.