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Related Concept Videos

Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

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Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
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The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
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Updated: Jan 8, 2026

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm
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Evaluating multi-source precipitation data for streamflow simulation using the SWAT model in the Alpine Manas River

Li Tan1, Chanjuan Zan2,3, Tie Liu4

  • 1School of Geophysics, Chengdu University of Technology, Chengdu, 610059, China.

Scientific Reports
|December 15, 2025
PubMed
Summary

Evaluating four precipitation products (CMFD, MSWEP, ERA5-LAND, IMERG) in Xinjiang

Keywords:
Adaptability assessmentAlpine basinHydrological modelPrecipitation productsStreamflow simulation

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Area of Science:

  • Hydrology and Remote Sensing
  • Climate Science
  • Water Resource Management

Background:

  • Precipitation product applicability varies regionally due to topography and climate.
  • Accurate precipitation data is crucial for hydrological modeling in cold, alpine basins.
  • Understanding multi-source precipitation product performance is key to improving model accuracy.

Purpose of the Study:

  • To compare the accuracy of four precipitation products (CMFD, MSWEP, ERA5-LAND, IMERG) in arid Xinjiang.
  • To assess the suitability of these products for streamflow simulation in the alpine Manas River Basin.
  • To provide references for hydrological modeling and water resource management in data-scarce alpine regions.

Main Methods:

  • Utilized comprehensive indexes for precipitation magnitude and event detection.
  • Employed the Soil and Water Assessment Tool (SWAT) model for streamflow simulations.
  • Analyzed discrepancies and performance across different seasons and intensity levels.

Main Results:

  • All products showed consistent intra-annual patterns but significant summer discrepancies.
  • IMERG underestimated monthly totals but overestimated in July-August; ERA5-Land showed substantial overestimation.
  • CMFD demonstrated optimal precipitation performance; MSWEP-based streamflow simulations yielded the best results (NSE > 0.65, PBIAS < 15%).

Conclusions:

  • CMFD offers the best overall precipitation accuracy, while MSWEP is most suitable for streamflow simulation in the Manas River Basin.
  • ERA5-LAND and CMFD resulted in consistent streamflow overestimation.
  • The study provides valuable insights for selecting precipitation data in data-scarce alpine environments.