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Related Concept Videos

Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Qualitative Analysis03:46

Qualitative Analysis

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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

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Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
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Pozzolans01:21

Pozzolans

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Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
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A common precursor for global hotspot lavas.

Matthijs A Smit1,2, Ellen Kooijman2

  • 1Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, British Columbia Canada.

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|October 14, 2024
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Summary
This summary is machine-generated.

Global hotspot lavas show uniform parental melt compositions, suggesting a depleted mantle source enriched during the Archaean, not a heterogeneous deep mantle. This explains lava chemistry without primordial relics.

Keywords:
GeochemistryGeologyPetrology

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Area of Science:

  • Geochemistry
  • Petrology
  • Mantle Dynamics

Background:

  • Hotspot lavas display chemical heterogeneity, often attributed to diverse deep mantle sources.
  • Directly characterizing primary melt compositions and mantle heterogeneity is scientifically challenging.

Purpose of the Study:

  • To investigate a global dataset of hotspot lavas to determine the incompatible-element composition of their parental melts and sources.
  • To constrain the origins of chemical variations observed in hotspot lavas.

Main Methods:

  • Analysis of trace-element ratios in a global dataset of hotspot lavas.
  • Comparison of elemental and isotopic compositions (radiogenic and noble-gas) of parental melts from various volcanic settings.

Main Results:

  • Trace-element ratios indicate that observed heterogeneity in hotspot lavas is secondary, resulting from ascent processes, not primary mantle variations.
  • Parental melts of hotspot lavas, kimberlites, and large igneous province basalts exhibit uniform elemental and isotopic compositions.

Conclusions:

  • Hotspot melt parental sources are likely a depleted, outgassed mantle reservoir, enriched by Archaean material.
  • This model reconciles observed lava compositions without necessitating a heterogeneous lower mantle or primordial Earth relics.