3 results about "Enrichment factor" patented technology

The invention discloses a method for quantitatively representing the supply proportion of a material-source intersection area based on element enrichment factor tracing. The method comprises the following steps: S1, establishing a bedrock mother rock element enrichment factor standard chart; s2, acquiring element enrichment factors of the sedimentary area; s3, principal component difference analysis; and S4, calculating the supply proportion of different material sources through linear regression. According to the method for quantitative characterization of the supply proportion of the material source intersection area based on element enrichment factor tracing, an element enrichment factor method is introduced into deep stratum material source research; by optimizing reference element selection, establishing a targeted mother rock standard chart and combining principal component analysis and linear regression, accurate tracing of deep stratum material sources and quantitative calculation of the intersection proportion are achieved, the blank of a deep stratum element enrichment factor material source tracing technology is filled, and the tracing method has a wide application prospect. And a key technical support is provided for deep reservoir prediction and oil-gas exploration of the petroliferous basin.

This invention discloses a method for assessing the risk of heavy metal contamination in soil of newly constructed reservoir areas through multi-scenario coupling simulation. The method includes the following steps: selecting soil samples with the highest content of the target heavy metal in the reservoir area for Al content detection and heavy metal speciation analysis; collecting background control samples from areas far from the reservoir area for heavy metal and Al content detection and heavy metal speciation analysis; calculating enrichment factors and geoaccumulation indices to determine pollution sources at sampling points; preparing average and extreme samples; preparing simulated reservoir water; and conducting static leaching experiments, dynamic disturbance experiments, and vertical leaching experiments, covering chemical risks during quiescent periods, physical risks during disturbance periods, and long-term infiltration geological risks. This invention not only couples multiple scenarios and simulates the most unfavorable conditions to accurately identify the maximum instantaneous risk of heavy metal release, but also quantifies and determines pollution sources, possessing source tracing capabilities.

This invention discloses a method for analyzing heavy metal pollution sources in groundwater based on characteristic ion screening. This method utilizes multi-media collaborative sampling to determine the concentration of heavy metals in groundwater, the content of BCR speciation in sediments, and the isotopic ratios of lead, zinc, and copper. Characteristic ion combinations are extracted through a three-level screening process using enrichment factors, ion ratio variation coefficients, and Pearson correlation. Three types of fingerprint vectors—water chemistry, solid phase speciation, and isotopic composition—are normalized and fused, and candidate pollution sources are matched using cosine similarity. With mass conservation as the primary likelihood and BCR speciation and isotopic mass balance as additional constraints, the spatial distribution field and high-risk areas are obtained through Kriging interpolation using the posterior mean of the MCMC output contribution rate and a 95% confidence interval. This invention can identify four types of pollution sources, reducing reconstruction error by 73% compared to the PMF method, compressing the confidence interval width by 65%–73%, and achieving a field compliance rate of 92%, providing quantitative evidence for pollution prevention and control and accountability.